US3768000A - Stepped sinusoidal-like waveform generating inverter circuit - Google Patents
Stepped sinusoidal-like waveform generating inverter circuit Download PDFInfo
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- US3768000A US3768000A US00204237A US3768000DA US3768000A US 3768000 A US3768000 A US 3768000A US 00204237 A US00204237 A US 00204237A US 3768000D A US3768000D A US 3768000DA US 3768000 A US3768000 A US 3768000A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
- H02M7/53803—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current
- H02M7/53806—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current in a push-pull configuration of the parallel type
Definitions
- An inverter circuit for generating a stepped sinusoidallike output has a transformer with a center tapped primary winding, a source of DC. voltage connected between the center tap point and ground or other reference point, and a pair of switch means respectively connected between the opposite ends of the primary winding and the common reference point, which switch means are rendered conductive sequentially and during spaced intervals during which an output is desired.
- Primary winding shunting switch means is connectable across all or half of the primary winding to short circuit that part of the winding carrying current to produce a substantially zero output between each pair of said spaced intervals.
- the primary winding shunting switch means most advantageously is a transistor or the like whose load terminals are connected between the center tap point of the primary winding and the juncture of a pair of diodes respectively connected to the opposite ends of the primary winding.
- TURN-OFF DRIVE 5 nan/vs i J I MINOR CIRCUIT TURN-OFF v DRIVE MEANS ZNvEN TOR STEPPED SINUSOIDAL-LIKE WAVEFORM GENERATING INVERTER CIRCUIT
- This invention relates to apparatus for generating relatively low frequency sinusoidal-like signals from a source of direct current, using relatively compact, light-in-weight components, and has its most important application in direct current powered single phase sinewave power supplies capable of delivering substantial amounts of power for various applications, such as power supplies for satellites and aircraft, where size, weight and/or cost limitations are important considersti m-
- the generation of low frequency sinewave current of substantial magnitude generally requires extremely bulky equipment, whether it be an electromechanical device, such as motor generator equipment, or electronic circuits.
- Electronic circuits commonly generate sinewave currentfrom the output of a direct current energized square wave generator or inverter circuit whose output appearing across the output of a transformer is filtered to provide a substantially sinusoidal waveform.
- a relatively recent development in electronic sinewave generator circuits produce an approximation of a'sinewave signal by the superpositioning of a number of square topped pulses of varying width and polarity to provide a stepped waveform whose general outline resembles a sinewave.
- US. Pat. No. 3,579,081 discloses, as examples of a basic invention also utilized in the present invention, several low frequency sinusoidal sinewave generator circuits each comprising a major and one or more minor bridge circuits each comprising two circuit branches including a pair of current control devices or switches like transistors connected in series circuit relation across a source of DC. voltage. Each pair of switches in each circuit branch are rendered alternately conductive so only one of these devices is conducting at a time. Different complementary alternating voltage outputs, which suddenly vary between various finite values and zero at different instants of time, are obtained across the output terminals of each of the bridge circuits located at the junctures between the pairs of switches in the circuit branches. The voltage outputs have a finitevalue about equal to the output of the DC.
- the present invention provides stepped sinusoidallike waveforms preferably-utilizing at least a pair of center-tapped transformer inverter circuits which provide different component square topped voltage waveforms which suddenly vary between various finite values and zero at different instants of time and each of which circuits requires three rather than four switches and has load current flowing only through one of the switches at a given time.
- This has the advantage of eliminating the voltage drop across one switch to increase the efficiencybf the circuit as well as reducing the cost and increasing the reliability thereof.
- the use of a cententa'pped transformer inverter circuit produces voltage conditions where the main inverter switches must withstand twice the applied DC. voltage, and so this circuit has its most advantageous application in lower voltage application than the bridge referred too.
- a pair of main transistor switches or the like are connected across the opposite ends of a center-tapped primary winding of a transformer and a common reference point.
- a source of DC voltage is connected between the center tap of the primary winding and the common reference point.
- a short circuit is directly provided across a winding of the transformer most advantageously across the half of the primary winding conducting current at a given instant of time.
- a transistor switch or the like is connected between the center tap of the primary winding and the juncture of a pair of diodes respectively connected to the opposite ends of the primary winding so as to complete paths of current flow in the associated halves, of the primary winding.
- Each diode and the load terminals of the latter transistor effectively short circuits the associated half of the primary winding which thereby reflects a short circuit of zero impedance condition across the terminals of the secondary winding.
- Properly timed control signals are fed to the control electrodes of the various transistors or other switch devices referred to to produce the desired plus, minus or zero output conditions across the transformer secondary winding.
- transformer coupled drive amplifiers In high power capacity inverter circuits, it is usually desirable to use transformer coupled drive amplifiers. Any feature which reduces the number of transformers in the drive amplifiers will desirably materially reduce the cost, weight and size of an inverter system.
- another feature of the invention is the utilization of a common drive transformer for two or more of the inverter switches of the same inverter circuit and/or for the two inverter circuits of the stepped sinusoidal like waveform generator circuit, even when the switches controlled by the common drive transformer have different conduction patterns.
- a still further feature of the invention provides more perfect zero output intervals which, in the absence of such feature, is not achieved because of a transformer coupled voltage drop appearing across the primary winding shunting transistor switch and diodes.
- FIG. 1 is a simplified diagram of a center-tapped transformer inverter circuit designed in accordance with the present invention
- FIG. 2 shows the output from tthe inverter circuit of FIG. 1; 7
- FIG. 3 shows two center-tapped transformer inverter circuits each providing complementary pulsed output waveforms andconnected together to provide a more nearly sinusoidal-like resultant output
- FIG. 4 is an exemplary circuit diagram for the circuit shown in FIG. 3;
- FIG. shows various voltages present at various designated points in FIG. 4.
- FIG. 6 shows an improvement in' the center-tapped transformer inverter circuit shown in FIG. 4 which pro-
- This inverter circuit generally indicated by reference numeral 2
- This inverter circuit includes a transformer 4 having a center-tapped primary winding formed by two primary-halves 4a and 4b, and a secondary winding 4c across which an output like El shown in FIG. 2 appears-[Switches S1 and S2, which may be transistors,
- Switch means S3 which may include a control switch like a transistor and diodes to be described, is connected across the primary winding 4a. When the control switch involved is rendered conductive, a short circuit-forming path is formed no matter what the polarities of the voltages or currents in the circuit are at the time involved. This short circuit is then reflected across the secondary winding 40 to provide an effective near zero impedance across the secondary winding to effect a zero voltage output condition for the inverter circuit.
- a control circuit 7 having a number form, one or more other pulse waveforms can be added to the waveform E1 shown in FIG. 2 as, for example, the waveform E2 shown in FIG. 5, which for each half cycle of waveform E1 supplies additive pulses during the first and last 30 interval and during the middle interval of each half cycle. These pulses have an amplitude approximately one-third that of the amplitude of the waveform E1. (Other more complex waveforms may be added, such as those shown in said U.S. Pat. No. 3,579,08l).
- Waveform E0 in FIG; 5 represents the summation of the waveforms E1 and B2.
- a second center-tapped transformer inverter circuit 2 is provided in addition to the inverter circuit 2, as shown in FIG. 3.
- the inverter circuits 2 and 2 will sometimes be referred to as the major and minor inverter circuits).
- the inverter circuit 2 shown in FIG. 3 is substantially identical to the inverter circuit 2 (and corresponding parts thereof have been similarly identified in FIG. 3 except for the addition of a prime to the reference characters) except that the turnsratio of the primary and secoridary windings of the transformers 4 and 4"and the control signal waveforms produced by control circuits 7 and 7 are different.
- the secondary windings4c and 4c are connected in series acrossoutput'terminals8 a'nd"10 at which the output. waveform E0 inFIG. 5 appears. .0 i
- FIG. 4 shows a transistorized embodiment of the invention where certainportions .ofthe control, circuitry 7 and7' used to control the-primary windingshort circuiting switch means 83 and S3 are combined into a common control circuit.
- the various transistor switches S1, S2, 51- and S2 are NPN type transistors with the collectors 12c of the transistor switches 81 and S2 and the collectors 12c of the transistor switches S1 and S2 respectively connected to the outer ends of the associated primary winding halves 4a-4b and 4a'-4b'.
- the conduction of the transistors 14 or 14' will establish a current path for the current flowing in the associated winding half 4a or 4a, and to effectively short circuit the associated transformer secondary winding 40 and prevent the build-up of high voltages when the associated transistor switch S1 or S2 is rendered non-conductive.
- This current path includes the emitter and collector of the transistor 14 or 14' and the'diode 16 or 16.
- transistor 14 or 14' when current is flowing in the primary winding half 4b or 4b, the conduction of transistor 14 or 14' establishes a short cu forming P t a r s tb as i sd p mary winding half 4b or 4b and including the emitter and collector of the transistor 14 or 14 and the associated diode 18 or 18.
- a common source of D.C. voltage 6 is utilized for both major and minor inverter circuits 2 and 2. Accordingly, the
- the bases 12b of the transistor switches S1 and S2 of the major inverter circuit 2 are respectively connected to outputs 24a and 24b of a major circuit turn-on drive means 24 at which outputs the control signal waveforms 3a and 3b shown in FIG. 5 appear.
- Each of these waveforms provides a positive output during the intervals at which the associated transistors are to be rendered conductive which, in the example of the invention being described, is a centered 120 interval for one half cycle of each cycle of operation of the inverter circuit.
- the bases 12b of the transistor switches S1 and S2 of the minor inverter circuit 2' are respectively connected to control signal outputs 24a and 24b at which the control signals Ea and Eb'shown in FIG. 5 appear.
- Each of the waveforms Ba and Eb provide a 30 positive pulse for the first and last 30 intervals and a centered 60 positive pulse of the half cycle during which the associated transistor switch is to be rendered conductive. Such pulses will render the associated NPN transistors conductive duringthe period such positive pulses exist.
- the circuit of FIG. 4 which is assumed to be one requiring a relatively high power drive to the transistors 14-14 includes a unique control circuit which utilizes only one main drive transformer for both the major and minor inverter circuits. To avoid transformer core saturation, it is important that, cover a cycle of operation of the transformer involved, approximately the same amount of positive and negative ampere turns of flux generating power are produced within the transformer core.
- the turn-off drive circuit includes a drive transformer 26 with a center-tapped primary winding having primary windings halves 26a 26b, the juncture of which is connected to one of the terminals of a source of D.C. voltage, a positive terminal in the exemplary circuit being described, which may be the positive terminal of the D.C. voltage source 6.
- Transformer 26 has a center-tapped secondary winding with secondary winding halves 26c 26d. The center-tap point of the secondary winding is connected to the positive terminal of the D.C. voltage source 6 to which the emitter l4e-l4e of the transistors 14-14 are also connected.
- the outer ends of the secondary winding halves 26c 26d are respectively connected by conductors 27-27 to the basesll4b-l4b' of the PNP transistors 14-14 which require a negative voltage to render them conductive.
- the voltage appearing between the outer terminal of the secondary wind half 26c and the positive center tap point thereof control the conduction of the transistor 14, and the voltage appearing between the outer terminal of the secondary winding half 26d and the positive center tap point thereof controls the conduction of the transistor 14'.
- the outer terminals of the primary winding halves 26a 26b are respectively connected to the collectors 18c-30c of a pair of NPN transistors 28 30 forming part of an inverter circuit.
- the emitters 28e-30e of the transistors 28-30 are shown connected to a common ground point, and the bases 28b 30b thereof respectively are shown connected to the output terminals 32a-34a of major and minor circuit turn-off drive means which generate the control signal waveforms Ec-Ec' shown in FIG. 5, which respectively render NPN transistor switches 28-30 conductive during the positive 1 amplitude intervals of the waveforms Ec-Ec'.
- control signals Ec Ec' fed to the bases 28b-30b have their positive l amplitude levels at different instants of time and, over a full cycle, the sum of the l amplitude intervals thereof, is the same for the-two waveforms. Since conduction of transistor switches 28-30 effects current flow respectively in opposite directions through primary winding halves 26a-26b, the plus and minus ampere turns generated in the transformer 26 over an operating cycle are equal, providing a balanced operation of the transformer.
- the transistor 30 when the transistor 30 is rendered conductive and current flows through the bottom primary winding half, the bottom or outer terminal of the secondary winding half 26b will be negative with respect to the positive center tap point thereof and the outer or upper terminal of the secondary winding half 260 will be positive with respect to the center tap point thereof. Conduction of the transistor 30 will, therefore, only result in the conduction of the transistor 14 of the minor inverter circuit 2'.
- an additional secondary winding which is illustrated as center-tapped winding having secondary winding halves 26e-26f, is provided on the transformer 26, so that one or the other of these winding halves can be short circuited. This has the same effect as short circuiting the .primary winding.
- the juncture points of the secondary winding halves 26e-26f is grounded, and the outer terminals thereof are respecswitch'36, the same becomes conductive to effectively short circuit that secondary winding half 26e or 26f across which a voltage is induced of a polarity which effects conduction of the associated diode 38 or 40.
- FIG. 6 show a further improvement in the inverter circuits 2 2' shown in FIG. 4.
- the voltage drop occurring across these elements acts as a low voltage source of, for example, the order of magnitide of l k volts.
- This voltage source is stepped up by the inductive coupling between the associated primary winding half 4a-4a' or 4b-4b, and appears as an undesired voltage, for example, three or four times this amount across the associatedfsecon dary winding 40 or 40.
- fthis voltage is substantially eliminated by circuitry like that shown in FIG. 6
- a low power transformre 44 having a primary winding 44a and secondary winding 44b 44b.
- One of the corresponding terminals of primary winding 44a is shown grounded and the other terminal thereof isconnecte i to the output 48a of a circuit turnoff drive means 48 which is a circuit which generates, for example", the waveform Ee shown in FIG.
- the waveforms Be and Be comprises pulses alternating between apositive l and a negative I amplitude level during intervals which the primary circuit shorting transistors 14-14' areconductive.
- One of the corresponding ends of the secondary windings 44b-44b (the upper ends as illustrated)'of the transformer 44 are respectively connected to the cathode of the diode 16 or 16' and the outer or bottom end of the primary winding half 4b or 4b ofthe transformer 4 or 4'.
- the bottom ends of the secondary windings 44b-44b are respectively connected to the outer or upper endof the primary winding half 4a or 40' of the transformer 4 or 4' and the cathode-of diode 18 or 18'.
- the anodes of the diodes 16- 18 or l6-'18' are respectively connected to the collector l4c-14c' of the transistor 14 or 14'.
- the cathodes of the latter diodes instead of being connected to the outer ends of the primary winding halves 4a-4b or 4a'-4b' of the transformers 4 or 4' as in the case of the circuit of FIG. 4, are instead connected to the noncorresponding ends of the secondary windings 44b 44b.
- the phase of the voltage waveforms Be and He applied to the primary winding 44a-44b' of the transformerv 44 is such that the polarity of the voltages induced across the secondary windings 44b-44b cancel the voltage drop occurring across the conducting transistor 14 or 14' and the .then conducting diode 16 or 16', or 18 or 18'.
- the amplitude of the voltages induced in the secondary windings 44b-44b is such as substantially to'cancel out the voltage drops developed across the transistor 14 or 14' and the diodes 16-18 or 16"l8',so that there will be little or no resultant voltage coupled into the secondary windings 4c or 4c. (The polarities shown in FIG. 6 of the voltages involved correspond to the polarities of the voltages present during the conducting intervals of the diodes and transistor switches involved, which occur during different half cycles).
- a transformer is provided having a center-tapped primary winding constituted by primary winding halves 50a-50b to the juncture point of which'is connected the positive terminal of a source of D.C. voltage, like the D.C.
- a pair of NPN transistor switches 52-54 are provided having collectors 52c-54c connected to the opposite ends of the primary winding halves 50a-50b, and grounded emitters.
- the bases 52b-54b of the transistor switches 52-54 respectively are connected to the output terminals 56a-56b of turnon drive means 56, which terminals respectively have the control voltage waveforms Ea-Eb' or Ea'-Eb shown in FIG.
- a secondary windingcomprising secondary winding halves 50e-50f is provided onthe transformer 50, the juncture point of which is grounded and whose opposite ends are respectively connected through diodes 60-62 to the collector 58c of a NPN transistor 58 whose emitteris grounded and whose base is connected to the output terminal 64a of a turn-off drive means 64 which produces-a control voltage waveform having a positive l amplitude level, during those intervals when the transistors 52-54 are both non-conductive, namely during the l amplitude intervals of the waveforms Ec or E0 shown in FIG. 5.
- filter circuits would be connected to the output of the various generator circuits above described to provide a substantially ripple-free sinusoidal-like waveform.
- the switch means for effecting an effective short circuit across the secondary winding 4c of the output transformer 4 may be located across the secondary winding 40 as illustrated in FIG. 8.
- a PNP transistor 14" is shown with its emitter 14a connected to the juncture of the cathodes of diodes l6a-18a whose anodes are respectively connected across the upper and lower ends of the secondary winding 4c, and its collector Me is connected to the juncture of the anodes of diodes l8b-l6b whose anodes are respectivelyconnected across the upper and lower ends of the secondary winding 40.
- the base 14b" of the transistor 14" is connected to the output of the control circuit 7 which provides pulses during those intervals when it is desired to produce a zero output for the inverter circuit.
- a stepped alternating voltage generating circuit comprising: a transformer having a center tapped primary winding and at least one secondary winding: a source of DC. voltage having a pair of DC. output terminals, said DC. output terminals being connected between a center tap point on said primary winding and a reference point; first and second switch means respectively connected between the ends of said primary winding and said reference point; control means for alternately rendering said switch means conductive during spaced intervals to effect current flow sequentially in opposite directions through different halves of said primary winding to generate pulses alternating in polarity in said secondary winding spaced by intervals where the output is substantially zero; and means for ensuring the sudden and continued disappearance in the output across said secondary winding during said spaced intervals including third switch means connectable across a winding of said transformer, and control means for rendering the latter switch means conductive during said spaced intervals wherein said third switch means is a current control device having a pair of load terminals connected in series with the center top point of said primary winding, and there is associated with said third
- a stepped alternating voltage generating circuit comprising: a major and a minor inverter circuit, each inverter circuit comprising a transformer having a primary winding and at least one secondary winding, a pair of DC. voltage input terminals connected between a center tap point on said primary winding and a reference point, first and second switch means respectively connected between the ends of said primary winding and said reference point, first control means for alternately rendering said first and second switch means conductive during spaced intervals to effect current flow sequentially in opposite directions through different halves of said primary winding to generate pulses alternating in polarity in said secondary winding spaced by intervals where the output is substantially zero, and
- third switch means connectable across a winding of said transformer and second control means for rendering the latter switch means conductive during said spaced intervals; the control means ofsaid major and minor bridge circuits rendering the associated first, second and third switch means conductive in different but complementary conduction patterns so the summation of the outputs of the secondary windings of the associated transformers produces a stepped, sinusoidal-like waveform; and means connecting the secondary windings of the transformers of said major and minor bridge circuits in series voltage additive relation.
- each inverter circuit is a current control device having a pair of load terminals connected in series with the center tap point of said primary winding and a control terminal which effects conduction of the switch means when a drive signal of a given polarity is fed thereto by said second control means, and there is associated with each third switch means a pair of rectifier devices respectively coupled in the same sense between the load terminal of said current control device remote from said primary winding and the opposite ends of said primary winding, to form respective paths shunting the respective halves of the primary winding to bypass the current flowing therethrough.
- An inverter circuit for cyclically driving two separate current control devices conductive in a conduction sequence wherein one of the current control devices is to be rendered conductive at a different time and more frequently than the other of same over a given cycle, each of said current control devices having load terminals and a control terminal which effects the conduction through the load terminals when voltage of the same given polarity is applied thereto, said inverter circuit comprising: a transformer having a center tapped primary winding and at least one center tapped secondary winding, a pair of D.C.
- first and second switch means respectively connected between the ends of said primary winding and said reference point, means connecting the opposite ends of said center tapped secondpair of current control devices, and first and second control means for respectively controlling the conduction of said first and second switch means in accordance with the desired conduction patterns of said first and second current control devices, said first and second control means effecting cyclic conduction patterns of said first and second switch means wherein a summation of the conducting intervals of each of said first and second switch over a given cycle of operation is identical to provide balanced operation of the transformer.
- An inverter circuit comprising: a transformer having a center tapped primary winding and at least one secondary winding, a pair of D.C. input terminals connected between the center tapped primary winding and a reference point, first and second means respectively connected between the ends of said primary winding and said reference point, control means for rendering said first and second switch means conductive respectively over spaced intervals of time wherein only one or the other of said switch means is conductive over any given interval and that interval is spaced from an interval during which the other switch means is to be rendered conductive, the conduction of said first and second switch means respectively resulting in current flow in opposite direction in different halves of .the center tapped primary winding, means for terminating current flow through said primary winding between the.
- first and second switch means are conductive comprising a center tapped secondary winding of said transformer having a center tap point connected to said reference point and a pair of ary winding respectively to the control terminals of said rectifier means connected in the same sense to a common point, and third switch means connected between said common point and said reference point, and control means for rendering said third switch means conductive when termination in the current flow through both halves of said primary winding is desired, to establish a short circuit path through said third switch means and one of said rectifier means across one of the halves of said center tapped secondary winding.
- a stepped alternating voltage generating circuit comprising: a transformer having a center-tapped primary winding and at least one secondary winding, a pair of D.C. input terminals connected between a center tap point on said primary winding and a reference point, first and second switch means respectively connected between the ends of said primary winding and said reference point, control means for alternately rendering said first and second switch means conductive to effect current flow sequentially in opposite directions through different halves of said primary winding, to generate pulses alternating in polarity in said secondary winding and spaced by intervals where the output is substantially zero, and turn-off means for ensuring the sudden and continued disappearance in the output across said secondary winding during said spaced intervals including third switch means connectable across at least the half of said primary winding carrying current at any instant, control means for rendering the latter switch means conductive during said spaced intervals, the conduction of said latter switch means resulting in a voltage drop thereacross which when applied across the primary winding will effect an imperfect zero output across said secondary winding, and zero output aiding means including
- said third switch means is a current control device having a pair of load terminals connected in series with a center tap point of said primary winding and there is associated with said third switch means a pair'of rectifier means respectively coupled in the same sense to-the load terminal of said current control device remote from said primary winding; and said zero output aiding means comprises second transformer means having a primary winding and a pair of secondary windings respectively connected in an opposite sense between the opposite ends of said center tapped primary winding of the first mentioned transformer and said pair of rectifier means, and a source of alternating voltage connected to said primary winding of said second transformer means to produce in said respective secondary windings thereat voltages of a polarity which respectively cancel out the voltage drop across the associated rectifier means and said third switch means during the half cycle when the associated rectifier means is operative to shunt the associated primary winding half.
- a stepped alternating voltage generating circuit comprising: a transformer having a center-tapped primary winding and at least one secondary winding, a pair of DC. input terminals connected between a center tap point on said primary winding and a reference point, first and second switch means respectively connected between the ends of said primary winding and said reference point, control means for alternately rendering said first and second switch means conductive to effect current flow sequentially in opposite directions through different halves of said primary winding to generate pulses alternating in polarity in said secondary winding and spaced by intervals where the output is substantially zero, and turn-off means for ensuring the sudden and continued disappearance in the output across said secondary winding during said spaced intervals including third switch means having' a pair of load terminals connected in series with the center tap point of said primary winding, and a pair of rectifier means respectively coupled in the same sense to the load terminal of said third switch means remote from said primary winding, and means comprising second transformer means having a primary winding and a pair of secondary windings respectively connected in an opposite sense between the
Abstract
Description
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US20423771A | 1971-12-02 | 1971-12-02 |
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US3768000A true US3768000A (en) | 1973-10-23 |
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US00204237A Expired - Lifetime US3768000A (en) | 1971-12-02 | 1971-12-02 | Stepped sinusoidal-like waveform generating inverter circuit |
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GB (1) | GB1354443A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4204266A (en) * | 1978-07-28 | 1980-05-20 | Lorain Products Corporation | Inverter drive circuit |
EP0195950A2 (en) * | 1985-02-28 | 1986-10-01 | SELENIA SPAZIO S.p.A. | Device which synchronizes free running oscillator frequency by means of a feedback saturable transformer and square wave output voltage |
US4698742A (en) * | 1986-08-01 | 1987-10-06 | The United States Of America As Represented By The Secretary Of The Air Force | High-voltage milberger slip slide power conditioner |
US4780801A (en) * | 1987-01-15 | 1988-10-25 | M-Power, Inc. | Uninterruptible power supply apparatus |
US5008797A (en) * | 1989-12-20 | 1991-04-16 | Sundstrand Corporation | Power converter utilizing line replaceable units |
DE4225269A1 (en) * | 1992-07-31 | 1994-02-03 | Asea Brown Boveri | Network harmonic attenuation method and a network coupling |
US5684686A (en) * | 1994-01-12 | 1997-11-04 | Deltec Electronics Corporation | Boost-input backed-up uninterruptible power supply |
US20030158478A1 (en) * | 2002-02-19 | 2003-08-21 | Siemens Corporation | Multiple level transmitter and method of transmitting |
RU2797403C1 (en) * | 2022-07-19 | 2023-06-05 | Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования "Новосибирский Государственный Технический Университет" | Single-phase autonomous voltage inverter |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2162703B (en) * | 1984-08-01 | 1988-06-02 | Peter Alan Temple | Dc to ac inverters |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3031629A (en) * | 1960-08-16 | 1962-04-24 | Bell Telephone Labor Inc | Power supply system |
US3205424A (en) * | 1961-05-23 | 1965-09-07 | Gulton Ind Inc | Voltage phase controller employing synchronized square wave generators |
US3328664A (en) * | 1964-05-08 | 1967-06-27 | Allis Chalmers Mfg Co | Transistor reverse current protective circuit |
US3408553A (en) * | 1966-04-11 | 1968-10-29 | Bell Telephone Labor Inc | Driven inverter-regulator with magnetic amplifier in feedback loop |
US3416062A (en) * | 1963-11-12 | 1968-12-10 | Svenska Ackumulator Ab | Device for the conversion of a direct current into a sinusoidal alternating current |
US3432737A (en) * | 1966-04-22 | 1969-03-11 | Marconi Co Ltd | Regulated direct current supply circuit with energy return path |
-
1971
- 1971-12-02 US US00204237A patent/US3768000A/en not_active Expired - Lifetime
-
1972
- 1972-07-17 GB GB3327772A patent/GB1354443A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3031629A (en) * | 1960-08-16 | 1962-04-24 | Bell Telephone Labor Inc | Power supply system |
US3205424A (en) * | 1961-05-23 | 1965-09-07 | Gulton Ind Inc | Voltage phase controller employing synchronized square wave generators |
US3416062A (en) * | 1963-11-12 | 1968-12-10 | Svenska Ackumulator Ab | Device for the conversion of a direct current into a sinusoidal alternating current |
US3328664A (en) * | 1964-05-08 | 1967-06-27 | Allis Chalmers Mfg Co | Transistor reverse current protective circuit |
US3408553A (en) * | 1966-04-11 | 1968-10-29 | Bell Telephone Labor Inc | Driven inverter-regulator with magnetic amplifier in feedback loop |
US3432737A (en) * | 1966-04-22 | 1969-03-11 | Marconi Co Ltd | Regulated direct current supply circuit with energy return path |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4204266A (en) * | 1978-07-28 | 1980-05-20 | Lorain Products Corporation | Inverter drive circuit |
EP0195950A2 (en) * | 1985-02-28 | 1986-10-01 | SELENIA SPAZIO S.p.A. | Device which synchronizes free running oscillator frequency by means of a feedback saturable transformer and square wave output voltage |
EP0195950A3 (en) * | 1985-02-28 | 1988-01-13 | SELENIA SPAZIO S.p.A. | Device which synchronizes free running oscillator frequency by means of a feedback saturable transformer and square wave output voltage |
US4698742A (en) * | 1986-08-01 | 1987-10-06 | The United States Of America As Represented By The Secretary Of The Air Force | High-voltage milberger slip slide power conditioner |
US4780801A (en) * | 1987-01-15 | 1988-10-25 | M-Power, Inc. | Uninterruptible power supply apparatus |
US5008797A (en) * | 1989-12-20 | 1991-04-16 | Sundstrand Corporation | Power converter utilizing line replaceable units |
DE4225269A1 (en) * | 1992-07-31 | 1994-02-03 | Asea Brown Boveri | Network harmonic attenuation method and a network coupling |
US5684686A (en) * | 1994-01-12 | 1997-11-04 | Deltec Electronics Corporation | Boost-input backed-up uninterruptible power supply |
US20030158478A1 (en) * | 2002-02-19 | 2003-08-21 | Siemens Corporation | Multiple level transmitter and method of transmitting |
US6939300B2 (en) * | 2002-02-19 | 2005-09-06 | Siemens Medical Solutions Usa, Inc. | Multiple level transmitter and method of transmitting |
US20050243650A1 (en) * | 2002-02-19 | 2005-11-03 | Petersen David A | Multiple level transmitter and method of transmitting |
RU2797403C1 (en) * | 2022-07-19 | 2023-06-05 | Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования "Новосибирский Государственный Технический Университет" | Single-phase autonomous voltage inverter |
Also Published As
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GB1354443A (en) | 1974-06-05 |
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