CA1239662A - Microcomputer-controlled light switch - Google Patents

Microcomputer-controlled light switch

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Publication number
CA1239662A
CA1239662A CA000504291A CA504291A CA1239662A CA 1239662 A CA1239662 A CA 1239662A CA 000504291 A CA000504291 A CA 000504291A CA 504291 A CA504291 A CA 504291A CA 1239662 A CA1239662 A CA 1239662A
Authority
CA
Canada
Prior art keywords
light
level
switch
intensity
microcomputer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000504291A
Other languages
French (fr)
Inventor
Steven B. Carlson
Gordon W. Pearlman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lightolier Inc
Original Assignee
Lightolier Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Lightolier Inc filed Critical Lightolier Inc
Application granted granted Critical
Publication of CA1239662A publication Critical patent/CA1239662A/en
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/257Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/2573Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit
    • H02M5/2576Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit with digital control
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04Controlling
    • H05B39/08Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
    • H05B39/083Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity
    • H05B39/085Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity by touch control
    • H05B39/086Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity by touch control with possibility of remote control
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H23/00Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
    • H01H23/02Details
    • H01H23/025Light-emitting indicators
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H23/00Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
    • H01H23/02Details
    • H01H23/12Movable parts; Contacts mounted thereon
    • H01H23/14Tumblers
    • H01H23/143Tumblers having a generally flat elongated shape
    • H01H23/145Tumblers having a generally flat elongated shape the actuating surface having two slightly inclined areas extending from the middle outward
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/054Application timeslot: duration of actuation or delay between or combination of subsequent actuations determines selected function

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Push-Button Switches (AREA)
  • Arc Welding Control (AREA)

Abstract

Abstract of the Disclosure A light level controller includes a micro-computer controlled light switch which responds to a manual tap or a longer manual depression of the switch in order to initiate various control modes for a light source. Preset levels of light intensity may be stored in the microcomputer's memory and an automatic fade mode may be initiated to cause the level of light intensity to fade from a current level to a preset level at a pre-established rate. The controller may respond to the momentary depression of the switch to initiate the auto-matic fade mode or if tapped while a fade is in progress it may cause the light source to make an abrupt transi-tion to either full on or full off, depending on whether a higher or lower level of light intensity is desired.
A depression of the switch for a period longer than a tap will cause the level of light intensity to continue to change until the switch is released, and simultan-eously this level will be stored in memory.

Description

~;~396~2 MICROCOMPUTER-CONTROLLED LIGHT SWITCH

Backqround of the Invention The present invention relates to a manually operated switch such as a wall-mounted light switch for controlling the level of light intensity from a light fixture and more particularly to a light level controller actuated by the switch which includes a microcomputer for initiating control programs to regulate the level of light intensity.
Wall-mounted light switches which include a dimmer have become increasingly popular especially for residential applications where it is desired to precisely control the level of light intensity in a particular room. ~uch light switches usually include a variable resistor which is manually manipulated to control the voltage input to the light, where the variable resistor is connected in series with the household AC power line. A desirable feature in such switches would be the ability to return to predetermined levels of light intensity from conditions of either full power on or full power off. At present, however, such switches have no such memory and formerly estab-lished light intensity levels may be reestablished only by manual operation and guesswork.
There are in existence, however, touch actuated dimmer controls which cycle through a dim to a bright cycle and back again, and include a memory function such that removing the hand from the switch will stop the cycle and store the level of light intensity at that point in memory. A subsequent touch will turn the light off and yet a further touch will return the light to its previous intensity level based upon the value of the intensity level stored in memory. While an improve-ment over the manually-operated variable-resistor type of dimmer, this dimmer may require the user to manually cycle through a complete cycle of dim light to bright light to arrive at a desired intensity level. This latter switch is known as a DECORA~ touch dimmer and is manufactured by Leviton Manu-facturing Company, Inc. of Littleneck, New York. The DECORA~
touch dimmer, however, lacks the versatility needed for certain 1 ~r~;' ~3~ii62 aesthetic effects such as an automatic gradual fade from one light level to another. Moreover, it cannot change the dlrection, that is, either the increasing (up) or the decreasing (down), of light intensity from one direction to another without com-pleting a full cycle from dim to bright and back again. Also, the touch dimmer has no "remote" capability tha-t would enable one to use its features from a remote location such as a hallway or another room. Full function remotes are common with ordinary two-position light switches, but have not been available for dimmers because of the complexity of the circuitry.
Yet another touch-type light control is shown in Hamilton, U.S. Patent No. 3,805,096, and in ~osaka, et al., U.S. Patent No. 4,359,670. These devices are responsive to the duration of touch for initiating various control functions but include no provision for automatically fading light from one level to another.
Automatic fading has in the past been available only in theatrical lighting systems employing very complicated switching inputs such as keyboard commands or elaborate banks of switches. Examples of such systems are showns in Williams, U.S. Patent No. 4,241,295; Dinges, et al., U.S. Patent No.
4,240,011; Van Buren, U.S. Patent No. 3,706,914; and Isaacs, 11.S. Patent Nos. 3,766,431 and 3,668,467.

Summary of the Invent n_ The present invention provides a highly versatile microcomputer-controlled light level intensity switch which is operated by a pair of non-latching switches which provide inputs to the microcomputer. The non-latching switches may be arranged as upper and lower switches on a rocker panel or independent pair of panels which are normally biased to remain in a neutral position. The switches are each connected in series with the AC mains power line so that when either switch is depressed a signal in the form of a series of sequential pulses is provided to the microcomputer.
When the switch is depressed in either the up or down direction, the microcomputer first determines whether ~LZ39~;2 the depression of the switch is momentary, that is, a brief tap, or whether it is being held down for a period of more than transitory duration. When the switch is held, the micro-computer advances the level of light intensity in the direction indicated by the switch, that is, either towards bright or towards dim. When -the switch is subsequently released the microcomputer stores that current level of light intensity as a "preset" level in its memory. If the switch is first tapped in either direction with the light intensity at some static level the microcomputer will cause the level of light intensity to automatically advance or "fade" towards a pre-determined level, either "full on," "off," or "preset." The fade may occur at a rate which can be programmed in the micro-computer. If desired, the speed of the fade may vary depending ~pon whether the fade is from dim to brisht or vice versa.
For example, it is possible to program all downward fades to occur more gradually than all upward fades. If the switch is tapped again while the light intensity is fading towards the preset level, the microcomputer will halt the fade and cause the light intensity level to abruptly shift to the preset level. If the "up" switch is tapped with light at the preset level, the light intensity will fade to full maximum. If it is tapped in the downward position when the light intensity level is at the preset position the light intensity will fade towards zero. Thus, the microcomputer interprets the character of the command, that is, a hold or a tap, determines the cur-rent control mode, and init-iates a light intensity control function accordingly. The three types of programs are preset, automatic fade, and abrupt transition.
The non-latching switches provide a pulse input, which is derived from the AC power source, to the light switch through a clamp and half-wave rectifying network. Thus, the input to the microcomputer is a series of square wave pulses.
The microcomputer has an internal program which counts the number of a sequential series of pulses to determine if the switch is being tapped or held and executes a control program mode accordingly.
The microcomputer is connected to a source of light ~;~39~
such as an incandescent light bulb of between 40 and 2,000 watts by means of a thyristor solid state switch. The thyristor controls power to the incandescent light source by turning on at a predetermined phase angle re]ative to the phase of the AC line source. For this purpose the thyristor is responsive to a timed firing signal generated by the microcomputer according to the program in operation. The firing signal is synchronized with the incoming power supply line by a zero crossing detector which detects the transition in the AC power line from positive to negative. The microcomputer receives the zero crossing information and synchronizes this information with its internal clock which controls the timing of the firing signal for the thyristor. In this way the timing of the thyristor firing signal is calibrated to the desired level of light intensity and represents a phase angle at which the AC line is gated into the incandescent light source.
When either the "up" or "down" switch is held the computer first determines the current level of light intensity.
The microcomputer then causes the level of light intensity to increase for "up" or decrease for "down" in predetermined increments by initiating thyristor firing signals which either advance the phase gating of the AC wave or retard it. As long as either switch is held "on," the level of light intensity will gradually advance or decline. Each time an additional increment of light intensity is added it replaces the current level in the memory which continues to be sampled in a closed-loop fashion until the switch is released. When the switch is released the current level of light intensity is stored in memory as a "preset" level.
When either switch is tapped the microcomputer inter-rogates memory to find out if the current level is equal to the preset level. This determines whether a fade is in progress or whether the light intensity is not changing. The subsequent control modes, "fade" and "abrupt transition," then depend upon whether the new leve] in memory is preset, full on, or full off, and whether the current level is higher than, lower than, or equal to this level.
The switches are wired in line with the main 120-12~9662 volt AC line. Since the switches are at all times either"on" or "off" and there are no variable resistors used for the dimming function, a parallel set of remote switches, also wired in line with the AC line, may be provided to give full remote capability. Thus, another switch box may be provided in a hallway or adjacent room which fully duplicates the functions of the primary switch box without the necessity for duplication of the microcomputer and its associated circuitry. The remote switches are wired in parallel with the primary switches through their wall-mounted switch box forming a second parallei input to the microcomputer.
A primary object of this invention is to provide a light level controller which provides a maximum degree of flexibility in altering levels of light intensi-ty according to the desires of the user.
A further object of this invention is to provide a light level controller which includes an automatic fader for gradually fading the light intensity level from a current level to a preset level.
Yet a further object of this invention is to provide a light level controller having means for manually overriding the automatic fader and for making abrupt transitions in light level intensity from a current level to a predetermined level.
A still further object of this invention is to provide a light level controller having the above features which can be mounted within a standard wall switch panel box and connected to a standard 60-cycle AC household power supply.
Yet a further of this invention is to provide a light level controller in a wall switch mounting which is microcomputer-controlled and responsive to the state of non-latching switches which provide a digital input signal to the microcomputer.
A still further object of this invention is to provide a light level controller having a plurality of light control modes in which the particular mode chosen is a function of the period of time that the non-latching control switch is pressed.
A further object of this invention is to provide a light level controller in a wall switch mounting having 1239~;2 a visual indication of the intensity of the light on the room.
A still further object of this invention is to provide a wall-mounted light level controller having full remote ca-pability.
The foregoing and other objectives, features and advantages of the present invention will be more readily under-stood upon consideration of the following detailed description of the invention taken in conjunction with the accompanying drawings.

Brief Description of the Drawings FIG. 1 is a schematic block diagram of a circuit constructed according to the present invention.
FIG. 2 is a side view of a wall switch mounting containing the circuit of the present invention illustrated in FIG. 1.
FIG. 3 is a front view of an alternate type of wall switch mounting.
FIG. 3(a) is a side view of the wall switch mounting of FIG. 3.
FIG. 4 is a flow chart diagram depicting the method of operation of the circuit illustrated in FIG. 1.
FIG. 4(a) is a continuation of a portion of the flow chart diagram of FIG. 4.
FIG. 4(b) is a further continuation of the flow chart diagram of FIG. 4.
FIG. 5 is a waveform diagram illustrating the method of controlling the line voltage input to a light source using the circuit of FIG. 1.

Detailed Description of the Invention A light source 10 which may be, for example, an incandescent light source drawing between 40 and 2,000 watts of power, is connected to a source of AC power 12 through a thyristor 14. The AC source 12 is a standard household power supply, 60-cycle, 120-volt AC. The thyristor 14 is a bi-directional SCR controller. The control line 11 for the thyristor ~f ~239~i62 14 is connected to a microcomputer 16. The microcomputer 16 is powered by a DC power supply 18 and includes an input from a zero crossing detector 20 which is also connected to AC power source 12. A wall switch mounting 22 (enclosed within the dotted line in FIG. 1) may include a pair of non-latching switches 24a and 24b and an LED display 26. The LED display may be connected to the microcomputer 16 by a bus 28 which may include any desired plurality of lines. In the example shown in FIG. 1, line 28 is an eight line bus. Each of the nonlatching switches 24a and 24b includes a rectifier and clamp circuit 30a and 30b, respectively, which provide half-wave rectification and voltage clamping. The switches 24a and 24b are connected to AC power source 12 through a resistor 17 and diodes 13 and 15. The output of the rectifier and clamp circuits 30a and 30b are connected as inputs to microcomputer 16. Micro-computer 16 also includes a clock which may, for example, be a crystal oscillator 32. The microcomputer 16 also includes as an input, a reset network 34. A remote input 19 may also be provided as a parallel input to circuits 30a and 30b. Remote input 19 is in all respects identical to the network of switches 24a and 24b including resistor 17 connected to the AC line and diodes 13 and 15. Thus, either the wall mounting 22 or the remote input 19 may initiate the functions discussed herein.
Between thyristor 14 and light source 10 there is a choke or induction coil 36 which provides current damping for the light source 10. Without such a choke 36 the filament in an incandescent light source such as light source 10 may physically oscillate under certain conditions. Thyristor 14 has an output comprising AC pulses having relatively fast rise times. The choke 36 smooths the shape of these pulses so that there is no ringing or spurious oscillation within the light source 10.
The input of the microcomputer 16 from -the rectifier and clamp circuits 30a and 30b is responsive to a series of sequential square wave pulses. These pulses are developed from the line inputs through either switch 24a or 24b. For example, if switch 24a is depressed the line voltage is fed to rectifier and clamp circuit 30a which provides half-wave 1;239662 rectification and clamps the voltage peaks to a level compatible with the microcomputer inputs, that is approximately 5 volts.
The switches 24a and 24b are arranged to provide "up" and "down"
light level changes, respectively. A detailed functional de-scription of the consequence of pressing either switch will be explained below, but, in general, switch 24a increases the brightness level of the light source 10 and may therefore be considered an "up" switch and switch 24b decreases the brightness level of the light source 10 and may therefore be considered a 'Idown'' switch. Accordingly, rectifier and clamp circuit 30b provides negative-going square wave pulses as an input to microcomputer 16 and the circuit 30a provides positive-going square wave pulses. The reset network 34 provides a signal that resets the microcomputer 16 upon initial power up of the system irrespective of fluctuation in the DC power supply 18.
Such circuits are well known in the electronics art. The zero crossing detector 20 determines the zero crossing points of the input power AC waveform from AC power source 12. This information is synchronized with the crystal oscillator 32 so that the thyristor 14 may be controlled by gating voltage from the AC power source 12 into the light source 10 at pre-determined times relative to the zero crossing points.
Microcomputer 16 is a single chip microcontroller which may include read only memory and random access memory.
Such a microcontroller is manufactured by National Semiconductor Co. and bears the model number COP413L. The microcomputer 16 receives commands from the rectifier and clamp circuits 30a and 30b, and synchronizes those commands with the zero crossing points of the AC power line by way of a signal from zero crossing detector 20, and provides appropriate firing commands to thyristor 14 over line 11. The programs executed by microcomputer 16 and the method of operating switches 24a and 24b to achieve the programmed results will be explained below.
Referring now to the flow chart diagrams of FIGS.
4, 4(a), and 4(b), there are four possible switch conditions for switches 24a and 24b. These are identified as the decision nodes "up held", "down held", "up valid", and "down valid".

~239662 There also exists the possibility that none of the four above conditions exists and the light will remain at its current level by the continuous completing of the zero crossing ("Z.C.") subroutine, shown in dotted outline in the bottom half of FIG. 4, once every 1/120 second. This subroutine is responsible for generating a firing or command signal over line 11 which controls the phase angle at which the triac fires during each 1/2 cycle of the 60 cycle AC power input. If desired, the Z.C. subroutine may be executed every other half cycle or every third half cycle. Thus an instruction could be provided in the program to skip a certain number of half cycles before executing the Z.C. subroutine. The effect of such an instruction would be to provide a more gradual automatic fade or preset.
The first step in the zero crossing subroutine is to determine if the current intensity level "C" equals a new or desired intensity level. The new level, indicated by the letter "N," may have one of three values. It may be equal to the "preset" level "full on" or "full off." Thus, in a case where N is equal to C, which would be the case if none of the switch conditions identified in the four decision nodes above currently existed, the microcomputer 16 would determine the time of zero crossing of the AC input wave with reference to its own internal clock. As soon as it is determined that a zero crossing has occurred the microcomputer 16 begins counting until it reaches a point in time in the current half-cycle of the AC wave at which the voltage input will cause the light 10 to have the desired level of light intensity N ( FIG. 5).
This point in time may be expressed as a phase angle of the line input wave. At the predetermined phase angle the micro-computer will initiate a firing signal which will cause the thyristor 14 to gate the remaining portion of the AC voltage wave into the light source 10. The resultant voltage input which is shown as the "load voltage" line in FIG. 5 is a sharply rising pulse whose power content represents a fraction of the total available AC power line output. The sharply rising in-put wave form is smoothed by choke 36 to eliminate ringing or oscillation of the filament in the light source 10.
The thyristor 14 is fired once each half cycle and ~23966Z

after each firing the microcomputer 16 interrogates the inputs from circuits 30a and 30b to determine the status of switches 24a and 24b. The interrogation sequence and the resulting computations to determine the proper light level occur during a brief period of time at the beginning and at the end of each half cycle of the input waveform as indicated by the shaded portions under the curve of the input wave in FIG. 5. During these periods no firing signal is generated and the thyristor 14 remains off. These are the points in the cycle, however, when the input voltage is lowest and the effect upon power availability is therefore negligible.
The microcomputer 16 determines the status of the switches 24a and 24b based upon the number of sequential square wave pulses counted at each of the switch inputs from circuits 30a and 30b during each sampling period. Depressing either of the switches 24a or 24b will cause circuit 30a or 30b to generate a series of square wave pulses for as long as the switch is depressed. Thus, the number of sequential pulses received is a function of the length of time that the user manually depresses the panel (refer to FIGS. 2 and 3) that actuates the switches 24a and 24b. The microcomputer 16 counts the number of pulses in order to discriminate between a "hold"
condition and a "tap" condition. If the microcomputer 16 reads a predetermined number of pulses "n" when it interrogates a switch input it may interpret the condition as a hold, and if it receives a number of pulses greater than a predetermined minimum "m" but less than n it may interpret the switch condition as a "tap." The predetermined minimum is necessary so that the micro-computer will not interpret spurious noise as a valid switch condition.
Referring again to the top of FIG. 4, if n pulses are counted while the input from rectifying and clamp circuit 30a is being sampled the microcomputer 16 determines that the up switch is being held. It then determines whether the current level of light C is at full power or less than full power.
If the current level of light C is less than full the micro-computer increments C and simultaneously makes the new level just achieved equal to C and the prese-t level P equal to C.

~Z3966Z
The zero crossing subroutine is then executed. The result of this loop is that as long as the user continues to depress switch 24a, the micrcomputer 16 will cause C to increment one step at a time per half cycle until the switch is released.
If switch 24b remains depressed the microcomputer 16 will de-crement C simultaneously making N equal to C and P equal to C until the light is either fully off or until the user re-leases the button controlling switch 24b. The operations N = C and P = C are also memory operations and values of N
and P are stored in memory for subsequent operations. The above described loops represent the preset mode of light control and serve to establish a new value in memory for a level of light intensity P at the same time that a new level of light intensity is being established in the light source 10 through the zero crossing subroutine.
If during a sampling period the microcomputer 16 discovers a "tap" condition on the "up" switch 24a, it executes the computational routine shown in FIG. 4(a). First the micro-computer 16 determines if the current level of light intensity equals the new or desired level of light intensity N. N could be the preset level stored in memory or could be a level cor-responding to full power on. If C = N, the microcomputer 16 then determines whether C = full power. If yes, the zero crossing subroutine is executed. If no, microcomputer 16 determines if N is then equal to P. If yes, the microcomputer makes N
equal to full power and executes the zero crossing subroutine.
If no, the microcomputer 16 makes N equal to P and executes the zero crossing subroutine. When N = P or N = full and the zero crossing subroutine is executed, N will not be equal ~o C and therefore the command "move C one towards N" in the zero crossing subroutine will be executed. Since the computational routine in FIG. 4(a) established N as a value which was not equal to the current value C of the light intensity level, the zero crossing subroutine will repeat itself until N = C
(assuming no switches have been depressed in the meantime), at which time the level of light intensity will remain constant at the new level N. Thus, when N does not equal C in the zero crossing subroutine, an automatic fade mode is initiated which :1;23966Z
moves C one incremental value towards N each time the loop is repeated. This loop is executed a chosen number of times a second and by choosing that number or the magnitude of the incremental steps through which N moves, the designer may regulate the slope of the automatic fade mode. For example, if the increments of N are made very small it would take the completion of more loops to move C to the value of N (a slower fade) than it would if the incremental values of C were made ]arger (a faster fade). According to the preferred embodiment, each half cycle is divided into 160 incremental steps and the Z.C.
subroutine is executed every third half cycle. This results in a fade in which the incremental increases or decreases in light intensity are imperceptible and the fade appears to be smooth and continous.
If the up button is tapped while the automatic fade mode is in operation, a different set of conditions will exist at the first decision node in FIG. 4(a). In this case C will not be equal to N because N = P = C and the microcomputer 16 will be in the process of fading C towards N. In such a case the microcomputer first determines if N is greater than or less than C. If N is greater than C, C is assigned a value that is equal to N. This causes the level of light intensity to abruptly jump from C to N. When the zero crossing subroutine is executed N will then be equal to C and the automatic fade mode will be circumvented as shown in FIG. 4. Thus, the difference between a fade and an abrupt transition lies in making C either equal to a new or desired level N or in making C equal to some value that is not N prior to execution of the zero crossing subroutine. For example, if N is not greater than C in FIG. 4(a), microcomputer 16 makes N equal to P, a preset level which is lower than C. Since N is then not equal to C at the commencement of the zero crossing subroutine, C
moves one step at a time towards N which is lower than C, and a downward automatic fade is commenced.
The operation of the switch when the down button is tapped is similar in operation to the situation encountered when the up button is tapped. If no fade is in progress when the down button is tapped, C will be equal to N. Subsequently, ~ ~ ~ ~7~

N will be made equal to zero and the zero crossing subroutine will cause the light intensity level to fade to off. If a fade is in progress such that when the down button is tapped, N is either equal to, greater than, or less than C, the light either fades to off or makes an abrupt transition to off.
A delay mode may be provided when a down fade is in progress to make downward fading more gradual than upward fading. Thus, if during a Z.C. subroutine a downward fade is detected, the microcomputer 16 delays the thyristor firing until the delay subroutine has been completed, incrementing the delay function one step at a time until its completion. If the down button is pressed while an up fade is in progress, N is made equal to zero and C fades towards N in the zero crossing subroutine.
If the down is pushed while the system is fading towards off, N will be less than C and microcomputer 16 will make C equal to N which will cause the auto-fade mode in the zero crossing subroutine to be circumvented and the light will make an abrupt transition to off.
Physically the system represented in the block diagram of FIG. 1 may be enclosed in a wall mounted light switch.
One example of such a switch is shown in the side view of the switch in FIG. 2. The switch of FIG. 2 includes a cover plate 38 and a rectangular bezel 40. The bezel 40 encloses a rocker mounted panel 42 which includes two inwardly extending fingers 44a and 44b. The fingers 44a and 44b are adapted ~o make con-tact with non-latching push buttons 46a and 46b. The push buttons 46a and 46b are mounted on a PC board 48 which also includes the circuit elements shown in the block diagram of FIG. 1 with the exception of the incandescent light source 10 and the AC power supply 12. The PC board 48 is mounted to an aluminum heat sink 50. An air gap safety switch 52 is also mounted to the heat sink which breaks the circuit when slider 67 is actuated. The switch components are enclosed in a box 54 of a size compatible with the current size standards for wall-mounted light switch boxes. Inside the box 54 is choke coil 36. an aperture 56 in box 54 provides a means for connection to the incandescent light source 10 by way of wire 58. The rocker panel 42 includes apertures 60 (only one such ~239~;~i2 aperture is shown in FIG. 2) in which are mounted light-emitting diodes (LEDs) such as LED 62. LED 62 is part of LED display 26 identified in FIG. 1. There may be as many LEDs as desired.
According to the preferred embodiment there should be eight because the National Semiconductor chip used for microcomputer 16 has eight outputs which may be arranged to provide a signal indicating the current level of light intensity. For example, the I.EDs may be arranged in an array extending along the rocker panel 42 from top to bottom so that the vertical position in the array of the LED that is on indicates the level of brightness.
The non-latching push buttons 46a and 46b correspond functionally to switches 24a and 24b in FIG. 1. Thus, depressing the upper portion of the rocker panel 42 will cause finger 44a to engage push button 46a and close the "up" switch 24a. Similarly, pressing the lower half of rocker panel 42 will close "down"
switch 24b. The rocker panel 42 is biased by a pair of angled legs 64a and 64b that fit snugly within an aperture in heat sink 50. The legs 64a and 64b cause the fingers 44a and 44b to release the push buttons 46a and 46b when Ihere is no manual pressure on either half on the rocker panel 42.
An alternative embodiment of the wall mounting for FIG. 2 is shown in FIGS. 3 and 3a. The wall mounting of FIG.
3 includes a cover plate 66 and a two push plates 68a and 68b.
LEDs 62 are arranged vertically from top to bottom through apertures in plates 68a and 68b, respectively. Each of the push plates 68a and 68b include inwardly protruding fingers 70a and 70b which engage push buttons 72a and 72b which are similar in all respects to push buttons 46a and 46b. The plates 68a and 68b are biased by a biasing means such as a spring (not shown). The electrical components of FIG. 1 are housed within a box 74 in a way similar to that depicted in FIG. 2.
Although non-latching switches are preferred, a center-off toggle switch (i.e., standard wall-mounted switch) could be used. The user must simply momentarily depress the switch in either direction and return it to center for a "tap" and hold it longer for a "hold."
In actual operation, pushing the up panel 68a or the upper half of rocker switch 42 when the light is off will -~ -14-1239~2 cause the level of light intensity to rise and fade gradually towards the preset level. If the fade is in progress, tapping panel 68a or rocking switch 42 in the up position will cause the light to make an abrupt transition to the preset level.
If up is pressed while -the light is at the preset level -the light will fade to a full power condition and if up is pressed while the light is fading to a full up condition the light will make an abrupt transition to full power. If down switch 68b or the lower half of rocker panel 42 is depressed, indicating a down switch condition, the light will fade towards off or zero. If down is pushed while a down fade is in progress, the light will make an abrupt transition to off. If, on the other hand, the up switch panel 68a or the upper portion of rocker panel 42 is pushed while a down fade is in progress, the light will fade to the preset level~ Whenever panel 68a or 68b is held in one position for a period of more than tran~
sitory duration, the iight level will move up or down stopping only when the panel is released~ Simultaneously, the micro-computer 16 will store that current level of light intensity in memory as the preset level P. This preset remains in memory until a subsequent holding of either of the switches to establish a new level.
If desired, the switching function may be divided between "tap" and "hold" and a second set of switches may be provided to take over one of the above functions. For example, a rocker panel could be dedicated to upward and downward taps and a second panel or toggle could provide the hold function for preset. Moreover, it is not necessary that the tap or hold functions depend on the time duration of -the depression of the switches. If two sets of switches are used, the micro~
computer 16 may be programmed to accept one set of switches at one input pin as the tap input and the second set as the hold, or preset, input on another pin regardless of length of time that either is held down.
The terms and expressions which have been employed in the foregoing specification are used therein as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding equivalents ~ ^

~Z3966;~-of the features shown and described or portions thereof, it being recognized that the scope of the invention is defined and limited only by the claims which follow.

Claims (21)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A light level controller including a source of light connected to at least one control switch means having a depressed state and a non-depressed state comprising:
(a) preset light intensity means for causing the light to assume a desired level of intensity when said control switch means remains in a depressed state for more than a period of transitory duration; and (b) automatic fading means for causing the light to fade towards said desired level of intensity when said switch is momentarily depressed.
2. The light level controller of Claim 1, further including instantaneous light intensity transition means for causing the light to advance rapidly towards said desired level when said control switch means is momentarily depressed while the light is fading towards said desired level of intensity.
3. The light level controller of Claim 1, said control switch means including two non-latching switches wherein a first one of said switches causes said automatic fading means to fade the light from a current intensity level to a brighter intensity level and a second one of said switches causes said automatic fading means to fade the light from said current intensity level to a dimmer intensity level.
4. The light level controller of Claim 3, wherein said non-latching switches are actuated from a wall mounted switch panel.
5. The light level controller of Claim 4, further including a plurality of light emitting elements located on said wall mounted switch panel for indicating a level of light intensity.
6. The light level controller of Claim 5, wherein said light emitting elements are arranged in a linear array wherein the level of light intensity is indicated by the position in the linear array of an energized light emitting element.
7. The light level controller of Claim 4, wherein said wall mounted switch panel includes a dual action panel having an upper segment for actuating said first switch and a lower segment for actuating said second switch wherein said dual action panel is normally biased to a neutral position at which neither of said switches are in a depressed state.
8. The light level controller of Claim 4, further including a remote control switch input connected through said wall mounted switch panel.
9. The light level controller of Claim 1, further including microcomputer means for determining the period of time that said control switch is depressed and for actuating said present light intensity means and said automatic fading means, respectively, as a function of said period of time.
10. The controller of Claim 9, wherein said microcomputer means further includes memory means for storing in memory a preset signal representing the current intensity of said source of light when said control switch is released while said preset light intensity means is establishing said desired level of light intensity.
11. A light level controller including a source of light connected to at least one non-latching switch having a depressed state and a non-depressed state comprising:
(a) signalling means responsive to said switch for providing an electrical signal, said signal continuing as long as said switch is in the depressed state;
(b) microcomputer means for computing the duration of said signal and for initiating light intensity control modes in response thereto, including a preset mode for establishing a preset level of light intensity, and an automatic fade mode for fading a current level of light intensity towards a predetermined level of light intensity.
12. A light level controller as claimed in Claim 11, further including synchronization means connected between a source of AC power and said microcomputer means for determining the zero crossing points of said AC power source to synchronize said microcomputer means with said AC power source.
13. The light level controller of Claim 11, further including electronic switch means connected between said light source and said source of AC power said electronic switch means being responsive to pulses generated during said light intensity control modes, said pulses being generated at predetermined times relative to said zero crossing points.
14. The light level controller of Claim 11, wherein said signalling means comprises pulse generating means for generating a sequential series of pulses as long as said switch is in a depressed state and wherein said microcomputer initiates said preset mode when more than n pulses are generated sequentially by said pulse means, where n is a predetermined number representing a period of time or more than transitory duration.
15. The light level controller of Claim 14, wherein said microcomputer means includes means for comparing the present level of light intensity, P, with a sampled level of light intensity, C, when less than n pulses are sequentially received, and for initiating said automatic fade mode in response to a condition including receipt of less than n pulses and C ? P.
16. The light level controller of Claim 15, wherein said microcomputer means includes means for abruptly advancing said light intensity level towards said preset level when said light source is fading towards said preset level and less than n pulses are sequentially received.
17. A light level controller including a microcomputer for controlling the level of intensity of a source of light, said light level controller including at least one manually operated switch comprising:
(a) preset mode control means for establishing a preset level of light intensity;
(b) automatic fade mode control means for automatically fading the level from a current level to a preset level; and (c) instantaneous mode control means for causing the level of light intensity to abruptly shift from a current level of intensity to a predetermined level of intensity when said manually operated switch is actuated while said automatic fade mode control means is in operation.
18. The light level controller of Claim 17, wherein said first switch condition comprises an operative condition for a first period of time and said second switch condition comprises an operative switch position for a second period of time where said second period of time is less than said first period of time.
19. The light level controller of Claim 17, wherein said automatic fade mode control means is initiated by briefly actuating said manually operated switch.
20. A light level controller including a source of light and an AC power source for powering said source of light and comprising control switch means interacting between said source of light, and said AC power source comprising means for initiating an automatic fade condition in said source of light when said control switch means is in first switch position and means for initiating a preset condition to preset said source of light to a chosen level when said control switch means is in a second switch position.
21. The light level controller of Claim 20, further including remote control switch means wired in parallel with said control switch means for duplicating at a remote location the functions of said control switch means.
CA000504291A 1985-04-17 1986-03-17 Microcomputer-controlled light switch Expired CA1239662A (en)

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US06/724,015 US4649323A (en) 1985-04-17 1985-04-17 Microcomputer-controlled light switch
US724,015 1985-04-17

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CN (1) CN86102632A (en)
AU (1) AU5600886A (en)
BE (1) BE904600A (en)
CA (1) CA1239662A (en)
DE (1) DE3612264A1 (en)
DK (1) DK173786A (en)
FR (1) FR2580888A1 (en)
GB (1) GB2173961B (en)
IT (1) IT1190627B (en)
NL (1) NL8600894A (en)
NO (1) NO861485L (en)
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Families Citing this family (93)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733138A (en) * 1985-12-05 1988-03-22 Lightolier Incorporated Programmable multicircuit wall-mounted controller
US5177409A (en) * 1987-01-12 1993-01-05 Nilssen Ole K Controllable electronic ballast
US4939428A (en) * 1988-01-26 1990-07-03 Westek Associates Touch switching system
US4963793A (en) * 1988-01-26 1990-10-16 Westek Associates Delayed response touch switch controller
US5406191A (en) * 1988-06-23 1995-04-11 Smart Set Oy Procedure and apparatus for the control of electric power
FI79772C (en) * 1988-06-23 1990-02-12 Smartset Oy FOERFARANDE OCH ANORDNING FOER STYRNING AV ELEFFEKT.
US5212478A (en) * 1989-03-31 1993-05-18 Lutron Electronics Co., Inc. Dynamic power recovery system
US5471190A (en) * 1989-07-20 1995-11-28 Timothy D. Schoechle Method and apparatus for resource allocation in a communication network system
GB2236025A (en) * 1989-09-15 1991-03-20 Desmond Bryan Leon Mills Dimmer switches
DE4002597A1 (en) * 1990-01-30 1991-08-01 Ako Werke Gmbh & Co Timer arrangement for stairs lighting
US5189412A (en) * 1990-05-11 1993-02-23 Hunter Fan Company Remote control for a ceiling fan
US5059871A (en) * 1990-07-09 1991-10-22 Lightolier Incorporated Programmable lighting control system linked by a local area network
WO1993020671A1 (en) * 1991-03-31 1993-10-14 Lutron Electronics Co., Inc. Lighting control device
CA2078295C (en) * 1991-08-05 1995-11-21 John Michael Putman Endoscope stabilizer
US5319283A (en) * 1991-08-05 1994-06-07 Novitas, Inc. Dimmer switch with gradual reduction in light intensity
US5597146A (en) * 1991-08-05 1997-01-28 Putman; J. Michael Rail-mounted stabilizer for surgical instrument
US5248919A (en) * 1992-03-31 1993-09-28 Lutron Electronics Co., Inc. Lighting control device
US5541584A (en) * 1992-05-15 1996-07-30 Hunter Fan Company Remote control for a ceiling fan
US5753983A (en) * 1992-06-16 1998-05-19 1012384 Ontario, Inc. Multi-function control switch for electrically operating devices
US5586048A (en) * 1992-06-16 1996-12-17 Vigilight Inc. Intelligent wall switch
IT1259010B (en) * 1992-07-24 1996-03-11 Relco Srl DEVICE FOR THE ADJUSTMENT OF LOADS SUPPLIED WITH ALTERNATING CURRENT
DE4231060A1 (en) * 1992-09-17 1994-03-24 Abb Patent Gmbh Electronic dimming method and dimmer for carrying out the method
US5336979A (en) * 1992-11-12 1994-08-09 Leviton Manufacturing Co., Inc. Microprocessor based touch dimmer system to control the brightness of one or more electric lamps using single or multi-key devices
WO1994015349A1 (en) * 1992-12-22 1994-07-07 Fuller Edward E Sr Electric lamp and time dependent illumination control
US5477111A (en) * 1994-03-28 1995-12-19 The Whitaker Corporation Triac drive for lighting and for inductive load control
US5955847A (en) * 1994-06-10 1999-09-21 Beacon Light Products, Inc. Method for dimming a fluorescent lamp
US5504398A (en) * 1994-06-10 1996-04-02 Beacon Light Products, Inc. Dimming controller for a fluorescent lamp
US5652481A (en) * 1994-06-10 1997-07-29 Beacon Light Products, Inc. Automatic state tranition controller for a fluorescent lamp
US5537010A (en) * 1994-06-10 1996-07-16 Beacon Light Products, Inc. Voltage-comparator, solid-state, current-switch starter for fluorescent lamp
US6297724B1 (en) 1994-09-09 2001-10-02 The Whitaker Corporation Lighting control subsystem for use in system architecture for automated building
US5445539A (en) * 1994-09-09 1995-08-29 The Whitaker Corporation Electrical wiring device for power control with low voltage input
US5550440A (en) * 1994-11-16 1996-08-27 Electronics Diversified, Inc. Sinusoidal inductorless dimmer applying variable frequency power signal in response to user command
US6356038B2 (en) 1994-12-14 2002-03-12 Richard A. Bishel Microcomputer-controlled AC power switch controller and DC power supply method and apparatus
US5736817A (en) * 1995-09-19 1998-04-07 Beacon Light Products, Inc. Preheating and starting circuit and method for a fluorescent lamp
US5909087A (en) * 1996-03-13 1999-06-01 Lutron Electronics Co. Inc. Lighting control with wireless remote control and programmability
DE19627732A1 (en) * 1996-07-10 1998-01-15 Abb Patent Gmbh Electronic actuator for controlling a load current
US5861720A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching power control circuit and method
US5861721A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching module
JP2880476B2 (en) * 1996-11-28 1999-04-12 株式会社タイムリーエレガンス Lighting device and picture frame to which the lighting device is attached
US5798581A (en) * 1996-12-17 1998-08-25 Lutron Electronics Co., Inc. Location independent dimmer switch for use in multiple location switch system, and switch system employing same
ES2144362B1 (en) * 1998-03-18 2001-01-01 Inurritegi Arrazola Juan Luis PERFECTED CONFIGURABLE ACCUMULATIVE TIMER.
WO1999060804A1 (en) * 1998-05-18 1999-11-25 Leviton Manufacturing Co., Inc. Network based electrical control system with distributed sensing and control
US6380696B1 (en) 1998-12-24 2002-04-30 Lutron Electronics Co., Inc. Multi-scene preset lighting controller
US6078159A (en) 1999-02-17 2000-06-20 The Chamberlain Group, Inc. Method and apparatus for programming a logic board from switching power
GB2351857A (en) 1999-07-01 2001-01-10 Kjd Electronics Lamp dimmer
US6505951B1 (en) 1999-10-08 2003-01-14 Mauricio H. Lorenzo, Jr. Wall-mountable, battery-operated light-emitting device
FR2808647A1 (en) * 2000-05-04 2001-11-09 Bernard Roux CONFIGURABLE ELECTRONIC LIGHTING CONTROL MODULE
US6608617B2 (en) 2000-05-09 2003-08-19 Marc O. Hoffknecht Lighting control interface
US6429598B1 (en) 2000-11-24 2002-08-06 R. John Haley Transformer and control units for ac control
KR100413216B1 (en) * 2001-04-06 2003-12-31 원 호 이 Apparatus for regulating intensity of illumination
US20040017158A1 (en) * 2002-07-26 2004-01-29 Svt Technologies Private Limited, Smart dimmer switch for maintaining constant luminance in a lighting environment
US6933686B1 (en) 2003-01-09 2005-08-23 Richard Anthony Bishel Programmable AC power switch
US7012518B2 (en) * 2003-04-18 2006-03-14 Cooper Wiring Devices, Inc. Dimmer control system with two-way master-remote communication
US6815625B1 (en) 2003-04-18 2004-11-09 Cooper Wiring Devices, Inc. Dimmer control switch unit
US6987449B2 (en) * 2003-04-18 2006-01-17 Cooper Wiring Devices, Inc. Dimmer control system with tandem power supplies
US7071634B2 (en) * 2004-01-07 2006-07-04 Lutron Electronics Co., Inc. Lighting control device having improved long fade off
US7683755B2 (en) * 2004-06-29 2010-03-23 Leviton Manufacturing Corporation, Inc. Control system for electrical devices
US7170018B2 (en) 2004-10-12 2007-01-30 Leviton Manufacturing Co., Inc. Dimmer switch
FR2878647B1 (en) * 2004-11-26 2007-02-23 Delta Dore METHOD FOR PROGRAMMING THE TIMING PERIOD OF A TIMER
US7375951B2 (en) * 2006-07-07 2008-05-20 Lutron Electronics Co., Inc. Load control device having a split enclosure
US20070121653A1 (en) * 2005-11-04 2007-05-31 Reckamp Steven R Protocol independent application layer for an automation network
US7694005B2 (en) 2005-11-04 2010-04-06 Intermatic Incorporated Remote device management in a home automation data transfer system
US20070256085A1 (en) * 2005-11-04 2007-11-01 Reckamp Steven R Device types and units for a home automation data transfer system
US7698448B2 (en) * 2005-11-04 2010-04-13 Intermatic Incorporated Proxy commands and devices for a home automation data transfer system
US7870232B2 (en) * 2005-11-04 2011-01-11 Intermatic Incorporated Messaging in a home automation data transfer system
US7640351B2 (en) * 2005-11-04 2009-12-29 Intermatic Incorporated Application updating in a home automation data transfer system
NZ543918A (en) * 2005-12-02 2007-04-27 Schneider Electric Nz Ltd Timer with multiple modes and time settings and able to fit a standard electrical switch plate
US7674003B2 (en) * 2006-04-20 2010-03-09 Streamlight, Inc. Flashlight having plural switches and a controller
US7549766B2 (en) * 2006-08-23 2009-06-23 Streamlight, Inc. Light including an electro-optical “photonic” selector switch
US7683504B2 (en) * 2006-09-13 2010-03-23 Lutron Electronics Co., Inc. Multiple location electronic timer system
US7579717B2 (en) * 2006-09-13 2009-08-25 Lutron Electronics Co., Inc. Wall-mountable timer for an electrical load
US10143065B2 (en) * 2006-11-10 2018-11-27 Michael M. Potempa Dimmer switch
US7573208B2 (en) * 2007-03-05 2009-08-11 Lutron Electronics Co., Inc. Method of programming a lighting preset from a radio-frequency remote control
US7652216B2 (en) * 2007-12-18 2010-01-26 Streamlight, Inc. Electrical switch, as for controlling a flashlight
US20100072917A1 (en) * 2008-09-23 2010-03-25 O'gorman Tony System for Control of Ballast Illumination in Step Dimming and Continuous Dimming Modes
US8508148B1 (en) * 2009-02-01 2013-08-13 MagicLux, LLC System for light and appliance remote control
DE102009016224A1 (en) * 2009-04-03 2010-10-07 Jürgen Kupper Intuitively operated electrical switch
EP2417832B1 (en) 2009-04-09 2015-02-25 Koninklijke Philips N.V. Intelligent lighting control system
US8294379B2 (en) * 2009-11-10 2012-10-23 Green Mark Technology Inc. Dimmable LED lamp and dimmable LED lighting apparatus
IT1399620B1 (en) * 2010-04-14 2013-04-26 Bevilacqua De LOW CONSUMPTION LAMP WITH LED-TYPE LIGHT SOURCES.
CN102384375B (en) * 2010-09-02 2015-04-08 上海擎阳电子科技有限公司 Micro-electronics integration module control type light-emitting diode (LED) lighting lamp
CN102404895B (en) * 2010-09-09 2014-02-19 陈家德 Illumination control system utilizing microcontroller and illumination control method
KR20130120407A (en) 2012-04-25 2013-11-04 서울반도체 주식회사 Light emitting diode dimming apparatus
US8829816B2 (en) * 2012-08-10 2014-09-09 Infineon Technologies Ag Linear walk arrangement
CN104782231A (en) * 2012-11-14 2015-07-15 皇家飞利浦有限公司 Phase-cut dimmer device and method of phase-cut dimming for a lighting unit controlled by a rocker-type user interface
US9093894B2 (en) 2012-12-17 2015-07-28 Greenmark Technology Inc. Multiple-level power control system
CN104020723B (en) * 2013-02-28 2016-11-02 黎辉 A kind of information source formula collective and distributive type pulse bus control system
US10057964B2 (en) 2015-07-02 2018-08-21 Hayward Industries, Inc. Lighting system for an environment and a control module for use therein
CN107333367B (en) * 2017-07-05 2023-09-26 深圳市晟碟半导体有限公司 Parameter adjusting system and method for induction lamp
US20200168411A1 (en) * 2018-11-26 2020-05-28 Michael M. Potempa Dimmer Switch
USD940369S1 (en) 2019-01-17 2022-01-04 Streamlight, Inc. Portable light having a movable head
USD907825S1 (en) 2019-01-15 2021-01-12 Streamlight, Inc. Portable light having a movable head
US11815868B2 (en) 2020-12-02 2023-11-14 Leviton Manufacturing Co., Inc. Load control with integral control interface

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1171914A (en) * 1966-10-21 1969-11-26 Thorn Electronics Ltd Lighting Control Apparatus.
US3766431A (en) * 1967-10-23 1973-10-16 Thorn Electrical Ind Ltd A lighting control system including an analogue to digital converter
US3706913A (en) * 1971-07-12 1972-12-19 James M Malatchi Plural channel light dimming system
US3706914A (en) * 1972-01-03 1972-12-19 George F Van Buren Lighting control system
US3805096A (en) * 1973-01-22 1974-04-16 W Hamilton Coded touch multifunction touch control switch circuitry
US3968401A (en) * 1974-11-27 1976-07-06 Strand Century Incorporated Apparatus for controlling the intensity of a light source
DE2856962A1 (en) * 1977-08-05 1980-11-27 L Wern TOUCH CONTROL SWITCH
US4240011A (en) * 1978-07-17 1980-12-16 Frank Dinges Keyboard operated controller
US4287468A (en) * 1978-08-28 1981-09-01 Robert Sherman Dimmer control system
US4284926A (en) * 1978-11-24 1981-08-18 Frank Dinges Decorative lighting control with a waveform generator
US4241295A (en) * 1979-02-21 1980-12-23 Williams Walter E Jr Digital lighting control system
JPS5665567A (en) * 1979-11-01 1981-06-03 Ricoh Co Ltd Control device for exposure lamp
US4511824A (en) * 1983-07-15 1985-04-16 Goddard Robert M Parallel access memory lighting system

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SE8601588L (en) 1986-11-10
NL8600894A (en) 1986-11-17
GB2173961B (en) 1989-02-08
BE904600A (en) 1986-08-18
CN86102632A (en) 1986-12-03
IT1190627B (en) 1988-02-16
JPS61243694A (en) 1986-10-29
US4649323A (en) 1987-03-10
NO861485L (en) 1986-10-20
DK173786A (en) 1986-10-18
DK173786D0 (en) 1986-04-16
SE8601588D0 (en) 1986-04-09
ZA862808B (en) 1986-12-30
DE3612264A1 (en) 1986-10-30
AU5600886A (en) 1986-10-23
IT8620105A0 (en) 1986-04-16
FR2580888A1 (en) 1986-10-24
GB8606167D0 (en) 1986-04-16
GB2173961A (en) 1986-10-22
IT8620105A1 (en) 1987-10-16

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