CN100563401C - The driving circuit system for fluorescent lamp tube of pulse-width modulation control - Google Patents
The driving circuit system for fluorescent lamp tube of pulse-width modulation control Download PDFInfo
- Publication number
- CN100563401C CN100563401C CNB2004100969308A CN200410096930A CN100563401C CN 100563401 C CN100563401 C CN 100563401C CN B2004100969308 A CNB2004100969308 A CN B2004100969308A CN 200410096930 A CN200410096930 A CN 200410096930A CN 100563401 C CN100563401 C CN 100563401C
- Authority
- CN
- China
- Prior art keywords
- signal
- power switch
- fluorescent tube
- controlling signal
- frequency
- 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 - Fee Related
Links
Images
Abstract
The invention relates to a kind of driving circuit system for fluorescent lamp tube of pulse-width modulation control, the driving circuit system for fluorescent lamp tube of this pulse-width modulation control comprises fixed frequency generator, pulse-width regulating device.This fixed frequency generator is responsible for receiving and according to the conducting detection signal of indication fluorescent tube conduction status, with decision output first frequency or second frequency, pulse-width regulating device then receives and the flow through feedback voltage of fluorescent tube electric current and first frequency or second frequency of indication is done computing, to export first controlling signal and second controlling signal.
Description
Technical field
The present invention relates to a kind of driving circuit system for fluorescent lamp tube of pulse-width modulation control, particularly relate to the driving circuit system for fluorescent lamp tube of the pulse-width modulation control of a kind of pulse width modulating control circuit, fluorescent tube drive system and method for operation thereof.
Background technology
(do not contain direct current (Direct Current, DC) the string ripple of composition), wherein, the stable operation voltage of fluorescent tube is close to constant to the frequency range of needed power supply about 30KHz～80KHz greatly during cathode fluorescent tube stable operation now.And the brightness of fluorescent tube all to be size of current by the fluorescent tube of flowing through determined, the voltage when starting fluorescent tube and then needing stable operation than usual exceeds 2～2.5 times.Starting resistor at the at present general employed cathode fluorescent tube of LCD is an example, its operating voltage all is that the size by fluorescent tube decides, for example the starting resistor as 14 cun, 15 cun cathode fluorescent tubes that LCD is used approximately is about 1400Vrms, when fluorescent tube operated in maximum rated current 7mA, its operating voltage was then greatly about about 650Vrms.Wherein, its employed fixed interchange output that pulse-width modulation control converter can convert the direct voltage input to symmetry of frequently operating is the common control mode of light modulation cathode fluorescent tube electric stabilizer.
See also shown in Figure 1ly, it is the circuit block diagram of the fluorescent tube drive system of existing known a kind of pulse-width modulation control.This fluorescent tube driving control system 100 comprises pulse signal producer 102, PWM controller 104, feedback voltage circuit for detecting 110, direct voltage source 112, the first power switch 108a, the second power switch 108b, transformer 114, stable electric capacity 116 and fluorescent tube 118.
In the prior art, PWM controller 104 is that the flow through feedback voltage 110a of fluorescent tube 118 electric currents of indication that a fixed frequency of being exported according to pulse signal producer 102 and the fluorescent tube current-sensing circuit 110 of flowing through are detected does computing, and output is used to control the first controlling signal 106a of the first power switch 108a and the second controlling signal 106b of the second power switch 108b then.Whether transformer 114 then decides the electric power that is supplied to fluorescent tube 118 by direct voltage source 112 through transformer 114 and stable electric capacity 116 according to the conducting of the first power switch 108a and the second power switch 108b.
Please consult shown in Figure 2ly simultaneously, it is the existing first known controlling signal and the waveform schematic diagram of second controlling signal.In the prior art, first controlling signal and second controlling signal are to be two same frequencys, maximal duty cycle be slightly less than 50 percent and phase difference be 180 the degree square waves.And transformer 114 is the conducting work periods of the different sizes of utilizing the first power switch 108a and the second power switch 108b and produces the power outputs of different sizes.
But operate with the existing known frequency of deciding, be used in the application of present fluorescent lamp control several shortcomings being arranged still, at present LCD (Liquid Crystal Display, LCD) in the application, the direct voltage source 112 that system supplied has only tens volts, and in Fig. 1, so only the cathode fluorescent tube converter by pulse-width modulation control mode adjustment output size needs the number of turns than high coil groups, just can provide enough high 2 to 3 times high pressure of operating than usual to light fluorescent tube.Yet the required number of turns of transformer is higher than more, is just representing the design of coil groups difficult more, so whole efficient can be more and more lower.
This shows that the driving circuit system for fluorescent lamp tube of above-mentioned existing pulse-width modulation control obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.The problem that exists for the driving circuit system for fluorescent lamp tube that solves pulse-width modulation control, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that the driving circuit system for fluorescent lamp tube of above-mentioned existing pulse-width modulation control exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, driving circuit system for fluorescent lamp tube in the hope of a kind of pulse-width modulation control of founding a kind of new structure, can improve the driving circuit system for fluorescent lamp tube of general existing pulse-width modulation control, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective of the driving circuit system for fluorescent lamp tube existence of existing pulse-width modulation control, and provide a kind of new pulse width modulating control circuit, technical problem to be solved is to make it by the whether conducting of detecting fluorescent tube, and can determine to produce two groups of different fixed frequencies, thereby be suitable for practicality more.
Another object of the present invention is to, a kind of fluorescent tube driving control system is provided, technical problem to be solved is to make it utilize two groups of different fixed frequencies, come the turn-on frequency of operand power switching circuit, to reduce the design difficulty of transformer, and then the raising whole efficiency, thereby be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of driving circuit system for fluorescent lamp tube according to the present invention's proposition, be to receive the also signal driving fluorescent lamp pipe of the indication one fluorescent tube operating conditions of foundation back coupling, this driving circuit system for fluorescent lamp tube comprises: a frequency generator, be to receive and according to the signal of an indication fluorescent tube conduction status, in order to decision output one first frequency and a second frequency one of them; One power switch control signal generator means, this power switch control signal generator means be receive and to an indication flow through the back coupling signal of fluorescent tube electric current and this first frequency and this second frequency one of them do computing, in order to export one first controlling signal and one second controlling signal; One protective circuit, this protective circuit are to receive and decide this first controlling signal of change and this second controlling signal according to the signal of this indication fluorescent tube conduction status; One power switch circuit is to receive this first controlling signal and this second controlling signal, and this power switch circuit comprises: one first power switch is to receive this first controlling signal, in order to control this first power switch conducting; And one second power switch, be to receive this second controlling signal, in order to control this second power switch conducting.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid a kind of driving circuit system for fluorescent lamp tube, this first power switch and this second power switch that wherein said first controlling signal and this second controlling signal are controlled all have an end points ground connection at least, and the work period of this first power switch and this second power switch conducting is all less than 50%.
Aforesaid a kind of driving circuit system for fluorescent lamp tube, the phase place of wherein said first controlling signal and this second controlling signal is an out of phase.
Aforesaid a kind of driving circuit system for fluorescent lamp tube, the back coupling signal of wherein said indication fluorescent tube conduction status are to be decided by this indication result that the back coupling signal of fluorescent tube electric current detected the fluorescent tube electric current that flows through.
Aforesaid a kind of driving circuit system for fluorescent lamp tube, the signal of wherein said indication fluorescent tube conduction status are to indicate the signal of the voltage that exports fluorescent tube to be determined by detecting.
The object of the invention to solve the technical problems also adopts following technical scheme to realize.The driving circuit system for fluorescent lamp tube of the tunable optical that proposes according to the present invention, it is the signal driving fluorescent lamp pipe that receives and indicate the fluorescent tube operating conditions according to one of back coupling, this driving circuit system for fluorescent lamp tube comprises: a frequency generator, be to receive and according to the signal of an indication fluorescent tube conduction status, in order to decision output one first frequency and a second frequency one of them; One power switch control signal generator means, this power switch control signal generator means be receive and to an indication flow through the back coupling signal of fluorescent tube electric current and this first frequency and this second frequency one of them do computing, in order to export one first controlling signal and one second controlling signal; One protective circuit, this protective circuit are to receive and decide this first controlling signal of change and this second controlling signal according to the signal of this indication fluorescent tube conduction status; One power switch circuit, this power switch circuit comprises: one first power switch is to receive this first controlling signal, in order to control this first power switch conducting; One second power switch is to receive this second controlling signal, in order to control this second power switch conducting; And a dimming function starting device, this dimming function starting device is to receive and according to the signal of this indication fluorescent tube conduction status, start dimming function in order to decision.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The driving circuit system for fluorescent lamp tube of aforesaid a kind of tunable optical, this first power switch and this second power switch that wherein said first controlling signal and this second controlling signal are controlled all have an end points ground connection at least, and the work period of this first power switch and this second power switch conducting is all less than 50%.
The driving circuit system for fluorescent lamp tube of aforesaid a kind of tunable optical, the phase place of wherein said first controlling signal and this second controlling signal is an out of phase.
The driving circuit system for fluorescent lamp tube of aforesaid a kind of tunable optical, the input signal of the dimming function of the driving circuit system for fluorescent lamp tube of wherein said tunable optical are the pulse signals that the driving clock pulse according to a LCD is produced.
The present invention also proposes a kind of drive circuit of fluorescent tube, and this drive circuit of fluorescent tube comprises: a frequency generator, receive and according to the signal of an indication fluorescent tube conduction status, in order to decision output one first frequency and a second frequency one of them; One power switch control signal generator means, this power switch control signal generator means receive and to an indication flow through the back coupling signal of fluorescent tube electric current and this first frequency and this second frequency one of them do computing, in order to export one first controlling signal and one second controlling signal; And a power switch circuit, having at least one switch, this power switch circuit couples a power supply and according to the electric power output with this power supply of this first controlling signal and this second controlling signal.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a kind of pulse width modulating control circuit, and it is to comprise fixed frequency generator, pulse-width regulating device.Above-mentioned fixed frequency generator is responsible for receiving and according to the conducting detection signal of indicating the fluorescent tube conduction status, is exported first frequency or second frequency with decision.Above-mentioned pulse-width regulating device is to receive and the flow through feedback voltage of fluorescent tube electric current and first frequency or second frequency of indication done computing, to export first controlling signal and second controlling signal.
Described according to preferred embodiment of the present invention, the first above-mentioned controlling signal and the phase place of second controlling signal are phase difference 180 degree.
The present invention proposes a kind of fluorescent tube driving control system, and it is to comprise direct voltage source, fluorescent tube, circuit for detecting, pulse width modulating control circuit, transformer unit and power switch circuit.Above-mentioned circuit for detecting is the operating conditions of detecting fluorescent tube, with the conducting detection signal and the feedback voltage of indicating the fluorescent tube electric current of flowing through of output indication fluorescent tube conduction status.Above-mentioned pulse width modulating control circuit is to comprise fixed frequency generator and pulse-width regulating device.Wherein, the fixed frequency generator is to receive and according to the conducting detection signal, with decision output first frequency or second frequency, pulse-width regulating device then receives and feedback voltage and first frequency or this second frequency is done computing, to export first controlling signal and second controlling signal.Above-mentioned transformer unit is responsible for alternating current is supplied to fluorescent tube.Above-mentioned power switch circuit is to receive and according to first controlling signal and second controlling signal, and determines by the size of direct voltage source through the alternating current that transformer unit produced.
Above-mentioned power switch circuit comprises two power switchs at least, and these two power switchs all have an end points ground connection at least.
Preferred embodiment of the present invention also comprises the dimming function start control circuit, and be to decide according to the conducting detection signal opportunity of dimming function starting.
Preferred embodiment of the present invention more comprises protective circuit, and protective circuit is to decide change first controlling signal and second controlling signal to reach defencive function according to the conducting detection signal.
Comprehensive above explanation, The present invention be directed to the needs on the fluorescent tube characteristic, use two groups of fixed frequency driving fluorescent lamp pipes, can reach and utilize the purpose of lighting fluorescent tube and driving fluorescent lamp pipe than the transformer of low number of turns ratio, reduce transformer difficulty in design, to improve whole efficiency.
Via as can be known above-mentioned, the invention relates to a kind of driving circuit system for fluorescent lamp tube of pulse-width modulation control, the driving circuit system for fluorescent lamp tube of this pulse-width modulation control comprises fixed frequency generator, pulse-width regulating device.This fixed frequency generator is responsible for receiving and according to the conducting detection signal of indication fluorescent tube conduction status, with decision output first frequency or second frequency, pulse-width regulating device then receives and the flow through feedback voltage of fluorescent tube electric current and first frequency or second frequency of indication is done computing, to export first controlling signal and second controlling signal.
In sum, the pulse width modulating control circuit of special construction of the present invention, it is by the whether conducting of detecting fluorescent tube, produces the purpose of two groups of different fixed frequencies with decision.The fluorescent tube driving control system of special construction of the present invention, it is to utilize two groups of different fixed frequencies, comes the turn-on frequency of operand power switching circuit, with the design difficulty of reduction transformer, and then improves whole efficiency.It has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and the driving circuit system for fluorescent lamp tube of more existing pulse-width modulation control has the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by a preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the circuit block diagram that has the fluorescent tube drive system of known a kind of pulse-width modulation control now.
Fig. 2 is the existing first known controlling signal and the waveform schematic diagram of second controlling signal.
Fig. 3 is the circuit block diagram according to the driving circuit system for fluorescent lamp tube of a kind of pulse-width modulation control of a preferred embodiment of the present invention.
Fig. 4 is the flow chart of steps according to the method for operation of a kind of fluorescent tube driving control system of a preferred embodiment of the present invention.
100,300: fluorescent tube driving control system 102: pulse signal producer
104: PWM controller 106a, 308a: first controlling signal
106b, 308b: the second controlling signal 108a, 310a: first power switch
108b, 310b: second power switch 110: the fluorescent tube current-sensing circuit of flowing through
112,312: direct voltage source 114: transformer
116: stable electric capacity 118,324: fluorescent tube
302: pulse width modulating control circuit 304: the fixed frequency generator
306: pulse-width regulating device 310: power switch circuit
314: fluorescent tube current-sensing circuit 314a flows through: feedback voltage
316: fluorescent tube conducting circuit for detecting 318: transformer unit
320: transformer 322: storage unit
326: circuit for detecting 328: the light modulation signal
330: dimming control switch 332: protective circuit
334: protection signal 336: transformer output voltage detection signal
110a: the feedback voltage of the fluorescent tube electric current of flowing through
316a: whether the indication fluorescent tube conducting detection signal of conducting
S402～s410: each steps flow chart
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of driving circuit system for fluorescent lamp tube, structure, feature and the effect thereof of a kind of pulse-width modulation control that foundation the present invention is proposed, describe in detail as after.
The present invention be directed to the needs on the fluorescent tube characteristic, come the driving fluorescent lamp pipe, can reach the transformer that utilizes low number of turns ratio and light the also mode of driving fluorescent lamp pipe, reduce the difficulty of design of transformer, improve whole efficiency with two groups of fixed frequencies.
See also shown in Figure 3ly, it is the circuit block diagram according to the driving circuit system for fluorescent lamp tube of a kind of pulse-width modulation control of a preferred embodiment of the present invention.In Fig. 3, this system 300 comprises pulse width modulating control circuit 302, circuit for detecting 326, power switch circuit 310, transformer unit 318 and fluorescent tube 324.Wherein, as be familiar with this skill person and can know easily, fluorescent tube 324 can be a cathode fluorescent tube, but not as limit.
In the present embodiment, circuit for detecting 326 comprises flow through fluorescent tube current-sensing circuit 314 and fluorescent tube conduction status circuit for detecting 316.Wherein, the fluorescent tube current-sensing circuit 314 of flowing through is electrically coupled to fluorescent tube 324, and is according to flowing through the electric current of fluorescent tube 324 and reset voltage 314a.Fluorescent tube conduction status circuit for detecting 312 is electrically coupled to fluorescent tube 324, and is to export the whether conducting detection signal 316a of conducting of indication fluorescent tube according to the electric current of fluorescent tube 324 of flowing through.
Pulse width modulating control circuit 302 comprises fixed frequency generator 304 and pulse-width regulating device 306.Wherein, fixed frequency generator 304 is electrically coupled to fluorescent tube conduction status circuit for detecting 316, and is to receive and according to conducting detection signal 316a, with decision output first frequency or second frequency.306 of pulse-width regulating devices are electrically coupled to fixed frequency generator 304, and are to receive and feedback voltage 314a and first frequency or second frequency are done computing, to export the first controlling signal 308a and the second controlling signal 308b.
In preferred embodiment of the present invention, the phase place of the first controlling signal 308a and this second controlling signal 308b is phase difference 180 degree.
In preferred embodiment of the present invention, the first power switch 310a and the second power switch 310b comprise that MOS type field effect electric crystal or two-carrier connect the face electric crystal, but all not as limit.
And two power switch 310a, 310b has an end points ground connection at least, two power switch 310a and not conducting simultaneously of 310b, and also the work period of its conducting is all less than 50%.
In preferred embodiment of the present invention, storage unit 322 can for example be an electric capacity, but not as limit.
The conducting detection signal 316a of indication fluorescent tube conduction status can also be used to controlling the starting opportunity of dimming function among the present invention, in the present embodiment, under the situation of this conducting detection signal 316a indication fluorescent tube conducting, dimming control switch 330 is shut (turn on) dim signal 328 and is begun to import pulse-width regulating device 306, to change its first controlling signal 308a and second controlling signal 308b output, utilizing the benefit of this conducting detection signal 316a starting dimming function is to guarantee that fluorescent tube has enough starting electric power and time.
In the application of reality, dim signal 328 can be that galvanic current is pressed input, or low frequency, for example can be the pulse signal between 100Hz～1.5KHz.In the occasion that LCD (LCD) is used, produced by the clock signal computing that drives LCD.
And under a lot of actual application, the conducting detection signal 316a of indication fluorescent tube conduction status can also be used to being protected as the foundation of system exception.Protective circuit 332 in the present embodiment can indicate the situation of fluorescent tube 324 not conductings to surpass one default period at the conducting detection signal 316a of indication fluorescent tube conduction status after; for example continue one second time; output protection signal 334 changes the first controlling signal 310a and the second controlling signal 310b of pulse-width regulating device 306 outputs, makes power switch circuit 310 stop conductings.
In addition, in the part of protective circuit 332, can also increase detection signal (dotted line) 336 the foundations of indication transformer 320 output voltages as the indicating lamp tube conduction status.When surpassing preset value, transformer output also exports the abnormal signal 316a of not conducting of indication fluorescent tube.
Please then consult Fig. 3 and shown in Figure 4, this Fig. 4 is the flow chart of steps according to the method for operation of a kind of fluorescent tube driving control system of a preferred embodiment of the present invention.
In this embodiment, be after startup, promptly to begin to detect fluorescent tube 324 operating conditions (s402) by circuit for detecting 326, and according to the fluorescent tube operating conditions output indication fluorescent tube conducting detection signal 316a of conducting whether, and the flow through feedback voltage 314a (s404) of fluorescent tube electric current of output indication.
Then, fixed frequency generator 304 is that first frequency or second frequency are to pulse-width regulating device 306 (s406) according to conducting detection signal 316a decision output promptly.Secondly, 306 of pulse-width regulating devices are done computing to feedback voltage 314a and first frequency or second frequency, and export first controlling signal and second controlling signal (s408).
Follow, 320 in transformer makes cycle of the first power switch 310a and power two switch 310b conductings according to the first controlling signal 308a and the second controlling signal 308b again, and decision is supplied to the size (s410) of fluorescent tube 324 electric power.
In preferred embodiment of the present invention, fluorescent tube 324 need drive by the voltage higher 2～3 times than general normal running when starting, therefore, when starting, fixed frequency generator 304 is to export a higher frequency, with the coupling efficiency of raising transformer, and then the mode of raising output voltage.And when fluorescent tube 324 during in usual operation, fixed frequency generator 304 is the lower frequencies of output one, in order to avoid high-frequency signal causes loss by spuious parasitic capacitance.
Comprehensive above explanation, fluorescent tube driving control system of the present invention is at the needs on the fluorescent tube characteristic, use two groups of fixed frequency driving fluorescent lamp pipes, not only can reach and utilize the transformer of low number of turns ratio to light fluorescent tube, and the purpose of driving fluorescent lamp pipe, also can reduce transformer difficulty in design, to improve whole efficiency.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (14)
1, a kind of driving circuit system for fluorescent lamp tube is to receive the also signal driving fluorescent lamp pipe of the indication one fluorescent tube operating conditions of foundation back coupling, it is characterized in that this driving circuit system for fluorescent lamp tube comprises:
One frequency generator is to receive and according to the signal of an indication fluorescent tube conduction status, in order to decision output one first frequency and a second frequency one of them;
One power switch control signal generator means, this power switch control signal generator means be receive and to an indication flow through the back coupling signal of fluorescent tube electric current and this first frequency and this second frequency one of them do computing, in order to export one first controlling signal and one second controlling signal;
One protective circuit, this protective circuit are to receive and decide this first controlling signal of change and this second controlling signal according to the signal of this indication fluorescent tube conduction status;
One power switch circuit is to receive this first controlling signal and this second controlling signal, and this power switch circuit comprises:
One first power switch is to receive this first controlling signal, in order to control this first power switch conducting; And
One second power switch is to receive this second controlling signal, in order to control this second power switch conducting.
2, a kind of driving circuit system for fluorescent lamp tube according to claim 1, it is characterized in that this first power switch and this second power switch that wherein said first controlling signal and this second controlling signal are controlled all have an end points ground connection at least, and the work period of this first power switch and this second power switch conducting is all less than 50%.
3, a kind of driving circuit system for fluorescent lamp tube according to claim 1, the phase place that it is characterized in that wherein said first controlling signal and this second controlling signal is an out of phase.
4, a kind of driving circuit system for fluorescent lamp tube according to claim 1, the back coupling signal that it is characterized in that wherein said indication fluorescent tube conduction status are to be decided by this indication result that the back coupling signal of fluorescent tube electric current detected the fluorescent tube electric current that flows through.
5, a kind of driving circuit system for fluorescent lamp tube according to claim 1, the signal that it is characterized in that wherein said indication fluorescent tube conduction status are to indicate the signal of the voltage that exports fluorescent tube to be determined by detecting.
6, a kind of driving circuit system for fluorescent lamp tube of tunable optical is to receive the signal driving fluorescent lamp pipe of also indicating the fluorescent tube operating conditions according to one of back coupling, it is characterized in that this driving circuit system for fluorescent lamp tube comprises:
One frequency generator is to receive and according to the signal of an indication fluorescent tube conduction status, in order to decision output one first frequency and a second frequency one of them;
One power switch control signal generator means, this power switch control signal generator means be receive and to an indication flow through the back coupling signal of fluorescent tube electric current and this first frequency and this second frequency one of them do computing, in order to export one first controlling signal and one second controlling signal;
One protective circuit, this protective circuit are to receive and decide this first controlling signal of change and this second controlling signal according to the signal of this indication fluorescent tube conduction status;
One power switch circuit, this power switch circuit comprises:
One first power switch is to receive this first controlling signal, in order to control this first power switch conducting;
One second power switch is to receive this second controlling signal, in order to control this second power switch conducting; And
One dimming function starting device, this dimming function starting device are to receive and according to the signal of this indication fluorescent tube conduction status, start dimming function in order to decision.
7, the driving circuit system for fluorescent lamp tube of a kind of tunable optical according to claim 6, it is characterized in that this first power switch and this second power switch that wherein said first controlling signal and this second controlling signal are controlled all have an end points ground connection at least, and the work period of this first power switch and this second power switch conducting is all less than 50%.
8, the driving circuit system for fluorescent lamp tube of a kind of tunable optical according to claim 6, the phase place that it is characterized in that wherein said first controlling signal and this second controlling signal is an out of phase.
9, the driving circuit system for fluorescent lamp tube of a kind of tunable optical according to claim 6, the input signal of dimming function that it is characterized in that the driving circuit system for fluorescent lamp tube of wherein said tunable optical are the pulse signals that the driving clock pulse according to a LCD is produced.
10. drive circuit of fluorescent tube is characterized in that it comprises:
One frequency generator receives and according to the signal of an indication fluorescent tube conduction status, in order to decision output one first frequency and a second frequency one of them;
One power switch control signal generator means, this power switch control signal generator means receive and to an indication flow through the back coupling signal of fluorescent tube electric current and this first frequency and this second frequency one of them do computing, in order to export one first controlling signal and one second controlling signal; And
One power switch circuit has at least one switch, and this power switch circuit couples a power supply and according to this first controlling signal and this second controlling signal the electric power of this power supply exported.
11. drive circuit of fluorescent tube according to claim 10 is characterized in that it more comprises a protective circuit, this protective circuit receives and closes this frequency generator according to the signal of this indication fluorescent tube conduction status.
12. drive circuit of fluorescent tube according to claim 10 is characterized in that wherein said power switch circuit is the semibridge system power switch circuit.
13. drive circuit of fluorescent tube according to claim 10, the signal that it is characterized in that wherein said indication fluorescent tube conduction status are to be decided by this indication result that the back coupling signal of fluorescent tube electric current detected the fluorescent tube electric current that flows through.
14. drive circuit of fluorescent tube according to claim 10 is characterized in that it more comprises a dimming function starting device, this dimming function starting device receives and indicates the signal of fluorescent tube conduction status according to this, in order to decision starting dimming function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100969308A CN100563401C (en) | 2004-12-06 | 2004-12-06 | The driving circuit system for fluorescent lamp tube of pulse-width modulation control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100969308A CN100563401C (en) | 2004-12-06 | 2004-12-06 | The driving circuit system for fluorescent lamp tube of pulse-width modulation control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1787711A CN1787711A (en) | 2006-06-14 |
| CN100563401C true CN100563401C (en) | 2009-11-25 |
Family
ID=36784960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100969308A Expired - Fee Related CN100563401C (en) | 2004-12-06 | 2004-12-06 | The driving circuit system for fluorescent lamp tube of pulse-width modulation control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100563401C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128080B (en) * | 2006-08-14 | 2011-06-15 | 佳世达科技股份有限公司 | Power supply system for cold cathode tube and light tube start method |
| CN102752902B (en) * | 2011-04-22 | 2014-10-15 | 登丰微电子股份有限公司 | Light-emitting diode (LED) driving circuit |
| TWI481313B (en) * | 2013-03-11 | 2015-04-11 | Inergy Technology Inc | Driver of ballast capable of detecting zero voltage switching |
| CN108601186A (en) * | 2018-06-26 | 2018-09-28 | 深圳市同洁科技有限公司 | A kind of lamp tube drive circuit |
-
2004
- 2004-12-06 CN CNB2004100969308A patent/CN100563401C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1787711A (en) | 2006-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102065600B (en) | LED dimming driving system | |
| CN101848577B (en) | LED driving system and driving method | |
| CN1882213B (en) | Multi-phase input dimming ballast with flyback converter and method therefor | |
| CN103298221B (en) | Dimming circuit and method of LED (Light Emitting Diode) lighting lamp | |
| WO2003098326A3 (en) | Backlight assembly having external electrode fluorescent lamp, method of driving thereof and liquid crystal display having the same | |
| CN201349354Y (en) | Analogy and digital dimming backlight source drive device | |
| CN102752940A (en) | High-efficiency LED (light-emitting diode) drive circuit and drive method thereof | |
| CN102196643B (en) | Linear constant-current controller, chip and driving device | |
| CN101578003B (en) | High-power LED driver | |
| CN102833916B (en) | DC (direct current) dimming type LED (Light Emitting Diode) drive circuit | |
| CN102938953A (en) | Average linear LED (Light Emitting Diode) drive circuit | |
| CN101502179A (en) | Discharge lamp lighting apparatus | |
| CN201349353Y (en) | Double-dimming backlight source drive device | |
| CN102395233A (en) | Switching light modulation LED driving circuit and LED lamp set | |
| CN101882881B (en) | Capacitance reducing method and associated devices | |
| CN101553071A (en) | Discharge lamp system and control method thereof | |
| CN103025021B (en) | Step-down light emitting diode (LED) drive circuit based on electrical inductance discharge time modulation | |
| CN202889703U (en) | DC light-modulation type LED drive circuit | |
| CN100563401C (en) | The driving circuit system for fluorescent lamp tube of pulse-width modulation control | |
| CN1387394A (en) | Drive system of fluorescent lamp and fluorescent lamp system using it | |
| CN109714859B (en) | Intelligent switch control circuit | |
| CN203788514U (en) | Discharge control module, silicon controlled rectifier light dimming LED drive circuit and system | |
| CN102646396B (en) | LED backlight drive circuit, liquid crystal display device and drive circuit | |
| CN203289708U (en) | A multi-loop current-limiting power supply circuit | |
| CN102892247A (en) | Method and circuit for improving crest factor of gas discharge lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091125 Termination date: 20181206 |