CN1512831A - Cold cathode fluorescent lamp driver - Google Patents
Cold cathode fluorescent lamp driver Download PDFInfo
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- CN1512831A CN1512831A CNA021517800A CN02151780A CN1512831A CN 1512831 A CN1512831 A CN 1512831A CN A021517800 A CNA021517800 A CN A021517800A CN 02151780 A CN02151780 A CN 02151780A CN 1512831 A CN1512831 A CN 1512831A
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- king light
- control circuit
- lamp
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- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
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Abstract
A cold-cathod fluorescence lamp driving device includes a master lamp driving circuit, an at least primary lamp driving circuit, a master lamp, an at least primary lamp, at least two photo sensors, a master lamp feedback control circuit and an at least primary lamp feedback control circuit, among which, the said primary and each sub lamp is corresponding to one photosensor to detect its brightness, the photosensor corresponding to the master lamp outputs current to the said master and each sub lamp feedback control circuits and compares current with that output by the photosensor corresponding to each sub lamp, so as to regulate the driving current to reach the aim of equal brightness drive.
Description
[technical field]
The present invention relates to a kind of driving device of cold-cathod fluorescent lamp, refer in particular to a kind of drive unit that a plurality of cold-cathode fluorescence lamps are powered.
[background technology]
The circuit structure of driving device of cold-cathod fluorescent lamp of the prior art is broadly divided into three sub-frameworks: first oneself resonance step-up circuit, be responsible for lighting of cold-cathode fluorescence lamp; It two is control circuit for pulse-width modulation and pre-compensating circuit, is responsible for the adjustment of drive current; It three is feedback control circuits, is responsible for the stable and overvoltage protection of briliancy of cold-cathode fluorescence lamp.
In the prior art; driving device of cold-cathod fluorescent lamp provides cold-cathode fluorescence lamp to drive required high voltage by self-resonance step-up circuit; and utilize control circuit for pulse-width modulation to adjust the work period of pre-compensating circuit; form adjustable drive current output; input as self-resonance step-up circuit; adjust the cold-cathode fluorescent lamp current; search cold-cathode fluorescent lamp current linear dimensions at last; utilize the effect of feedback control circuit, reach the function of stablizing cold-cathode fluorescence lamp operating current and overvoltage protection.
A kind of driving device of cold-cathod fluorescent lamp 1 of prior art as shown in Figure 1, it comprises voltage source 11, pre-compensating circuit 12, LC parallel resonance transforming circuit 13, cold-cathode fluorescence lamp 14, resistance 15, electric capacity 16, feedback control circuit 17 and control circuit for pulse-width modulation 18.
This voltage source 11 is connected to pre-compensating circuit 12, for whole drive circuit provides voltage, this pre-compensating circuit 12 inputs to LC parallel resonance transforming circuit 13 after the electric current of voltage source 11 inputs is adjusted, but this moment, voltage still was low-voltage, boost to can directly lighting the high voltage of cold-cathode fluorescence lamp 14 through LC parallel resonance transforming circuit 13, resistance 15, electric capacity 16 and cold-cathode fluorescence lamp 14 common formation current supply circuits, the electric current of this current supply circuit feeds back to this feedback control circuit 17 through a tributary circuit, this feedback control circuit 17 responds the size variation of current supply circuit electric currents and produces the different output current value, and the duty ratio by this output current value control control circuit for pulse-width modulation 18 output voltage signals, this control circuit for pulse-width modulation 18 is connected to pre-compensating circuit 12, and adjust work period of pre-compensating circuit 12 by the voltage signal of different duty of output, and then change the drive current size, reach the purpose of stablizing cold-cathode fluorescence lamp 14 operating currents.
But in the prior art at the required light source of module backlight, often utilize double joint or many cathode fluorescent tubes, when it lights many fluorescent tubes simultaneously, often have and do not wait bright phenomenon, be head it off, the practice of prior art is that to choose specific fluorescent tube be the king light pipe, by searching to its drive current, mode with feedback compensation, control all the other every lamp tube current respectively, make it follow the lamp tube current change that is chosen to be the king light pipe, and reach the consistency of the drive current of all fluorescent tubes, this kind way can reach the purpose of bright driving such as approximate, but because the nuance on every fluorescent tube electro-optical characteristic is (generally under the same current drive condition, homotype fluorescent tube briliancy difference is in 2%), therefore the drive current with indivedual fluorescent tubes is controlled to the same situation, only can be similar to the purpose that reaches bright drivings such as fluorescent tube.And with the prolongation of service time, the degree of aging of fluorescent tube is different, and its electro-optical characteristic also can change, thereby the aggravation fluorescent tube does not wait bright phenomenon.
[summary of the invention]
Drive and do not wait bright problem for overcoming in the prior art a plurality of cold-cathode fluorescence lamps, the invention provides a kind of bright device driven such as multiple cold-cathode fluorescent lamps that realizes.
The technical scheme of technical solution problem of the present invention is: a kind of driving device of cold-cathod fluorescent lamp is provided, it comprises a king light tube drive circuit, at least lamp tube drive circuit, one king light pipe, at least fluorescent tube, at least two light-sensitive elements, one king light pipe feedback control circuit and at least fluorescent tube feedback control circuit, wherein, this king light pipe and equal corresponding one light-sensitive element that is used for detecting its briliancy of fluorescent tube each time, the electric current of the light-sensitive element of this king light pipe correspondence output branches to this king light pipe feedback control circuit and fluorescent tube feedback control circuit each time, and right with the current ratio of the light-sensitive element output of fluorescent tube correspondence each time, reach briliancy drivings such as each fluorescent tube.
Compare with prior art, the advantage of driving device of cold-cathod fluorescent lamp of the present invention is that it is applied in the multiple cold-cathode fluorescent lamps system, utilize light-sensitive element to detect the briliancy of each cold-cathode fluorescence lamp, choose one of them as the king light pipe, the brightness value of all the other each fluorescent tubes is followed the change of king light pipe briliancy, thereby make the briliancy of each cold-cathode fluorescence lamp remain unanimity, and briliancy difference appear in variation in time.
[description of drawings]
Fig. 1 is the schematic diagram of prior art driving device of cold-cathod fluorescent lamp.
Fig. 2 is the structured flowchart of driving device of cold-cathod fluorescent lamp of the present invention.
Fig. 3 is the schematic diagram of king light tube drive device of the present invention.
Fig. 4 is the schematic diagram of of the present invention lamp tube driver.
[embodiment]
Please refer to Fig. 2, be the structured flowchart of driving device of cold-cathod fluorescent lamp 2 of the present invention, it comprises time lamp tube drive circuit 21, king light tube drive circuit 22, inferior fluorescent tube 23, king light pipe 24, light-sensitive element 25, king light pipe feedback control circuit 26 and inferior fluorescent tube feedback control circuit 27.
This time lamp tube drive circuit 21 is responsible for time fluorescent tube 23 operating current is provided, this king light tube drive circuit 22 is responsible for king light pipe 24 operating current is provided, this king light pipe 24 and each time all corresponding light-sensitive element 25 of fluorescent tube 23 be used for detecting its briliancy, each fluorescent tube 23,24 luminous brightness value receive by light-sensitive element 25 and detect, and be converted into corresponding current signal, import corresponding feedback control circuit respectively.Wherein, the king light pipe feedback control circuit 26 main control king light tube drive circuits 22 of being responsible for, stable with the operating current of guaranteeing king light pipe 24, inferior fluorescent tube feedback control circuit 27 receives by the inferior fluorescent tube 23 of light-sensitive element 25 inputs and the briliancy current signal of king light pipe 24, and compare, according to the briliancy current signal difference of inferior fluorescent tube 23 and king light pipe 24, the corresponding signal of adjusting of output, inferior lamp tube drive circuit 21 is adjusted, consistent to guarantee time fluorescent tube 23 with the briliancy of king light pipe 24.In the present invention, this light-sensitive element 25 can be various types of photo-electric conversion elements, as photo resistance, photodiode etc.
Please cooperate with reference to Fig. 3, it is the schematic diagram of king light tube drive device of the present invention, this king light tube drive device comprises king light pipe 24, light-sensitive element 25, king light pipe feedback control circuit 26 and king light tube drive circuit 22, and this king light tube drive circuit 22 comprises voltage source 220, pre-compensating circuit 221, control circuit for pulse-width modulation 222, LC parallel resonance transforming circuit 223, resistance 224 and electric capacity 225.
This voltage source 220 is connected to pre-compensating circuit 221, for the king light tube drive device provides voltage, this pre-compensating circuit 221 inputs to LC parallel resonance transforming circuit 223 after the electric current of voltage source 220 inputs is adjusted, but this moment, voltage still was low-voltage, boost to can directly lighting the high voltage of king light pipe 24 through LC parallel resonance transforming circuit 223, resistance 224, electric capacity 225 and king light pipe 24 constitute current supply circuit together jointly, this light-sensitive element 25 receives king light pipe 24 issued lights, and its brightness value is converted into corresponding king light pipe briliancy current signal 251, this king light pipe briliancy current signal 251 inputs to this king light pipe feedback control circuit 26, the size variation of this king light pipe feedback control circuit 26 these king light pipe briliancy current signals 251 of response and the different output current value that produces, and the duty ratio by this output current value control control circuit for pulse-width modulation 222 output voltage signals, this control circuit for pulse-width modulation 222 is connected to pre-compensating circuit 221, and adjust work period of pre-compensating circuit 221 by the voltage signal of different duty of output, and then change the drive current size, reach the purpose of stablizing king light pipe 24 operating currents.This king light pipe briliancy current signal 251 also is connected to each time fluorescent tube feedback control circuit 27, to control the glorious degrees of each time fluorescent tube 23, itself and king light pipe 24 briliancy is consistent.
Please refer to Fig. 2 and Fig. 4, it is the schematic diagram of of the present invention lamp tube driver, this time lamp tube driver comprises time fluorescent tube 23, light-sensitive element 25, inferior fluorescent tube feedback control circuit 27 and time lamp tube drive circuit 21, and this time lamp tube drive circuit 21 comprises voltage source 210, pre-compensating circuit 211, control circuit for pulse-width modulation 212, LC parallel resonance transforming circuit 213, resistance 214 and electric capacity 215.The operation principle of this time lamp tube driver and king light tube drive device are roughly the same, but secondly fluorescent tube feedback control circuit 27 is except that the briliancy current signal that receives the inferior fluorescent tube of being imported by light-sensitive element 25 23, also receive the briliancy current signal 251 of king light pipe 24, and compare, according to briliancy current signal difference between the two, the corresponding signal of adjusting of output is adjusted pre-compensating circuit 211, and is consistent with the briliancy of king light pipe 24 to guarantee time fluorescent tube 23.
Claims (8)
1. driving device of cold-cathod fluorescent lamp, it comprises: a king light tube drive circuit, at least lamp tube drive circuit, one king light pipe, at least fluorescent tube, one king light pipe feedback control circuit and at least fluorescent tube feedback control circuit, it is characterized in that: this driving device of cold-cathod fluorescent lamp also comprises at least two light-sensitive elements, this king light pipe and equal corresponding one light-sensitive element that is used for detecting its briliancy of fluorescent tube each time, the electric current of the light-sensitive element of this king light pipe correspondence output branches to this king light pipe feedback control circuit and fluorescent tube feedback control circuit each time, and right with the current ratio of the light-sensitive element output of fluorescent tube correspondence each time, reach briliancy drivings such as each fluorescent tube.
2. driving device of cold-cathod fluorescent lamp as claimed in claim 1 is characterized in that this light-sensitive element is photo resistance or photodiode.
3. driving device of cold-cathod fluorescent lamp as claimed in claim 1 is characterized in that this king light tube drive circuit comprises that one provides this king light pipe to light required high-tension resonance step-up circuit.
4. driving device of cold-cathod fluorescent lamp as claimed in claim 3 is characterized in that this king light tube drive circuit comprises that one regulates the pre-compensating circuit of drive current, and this pre-compensating circuit is connected to this resonance step-up circuit.
5. driving device of cold-cathod fluorescent lamp as claimed in claim 4, it is characterized in that this king light tube drive circuit comprises a control circuit for pulse-width modulation, this control circuit for pulse-width modulation connects this king light pipe feedback control circuit and this pre-compensating circuit, it receives the control signal of this king light pipe feedback control circuit input, and controls the work period of this pre-compensating circuit thus.
6. driving device of cold-cathod fluorescent lamp as claimed in claim 1 is characterized in that this king light tube drive circuit comprises that one provides this king light pipe to light required high-tension resonance step-up circuit.
7. driving device of cold-cathod fluorescent lamp as claimed in claim 6 is characterized in that this king light tube drive circuit comprises that one regulates the pre-compensating circuit of drive current, and this pre-compensating circuit is connected to this resonance step-up circuit.
8. driving device of cold-cathod fluorescent lamp as claimed in claim 7, it is characterized in that this time lamp tube drive circuit comprises a control circuit for pulse-width modulation, this control circuit for pulse-width modulation connects this time fluorescent tube feedback control circuit and this pre-compensating circuit, it receives the control signal of this time fluorescent tube feedback control circuit input, and controls the work period of this pre-compensating circuit thus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021517800A CN100455155C (en) | 2002-12-28 | 2002-12-28 | Cold cathode fluorescent lamp driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021517800A CN100455155C (en) | 2002-12-28 | 2002-12-28 | Cold cathode fluorescent lamp driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1512831A true CN1512831A (en) | 2004-07-14 |
| CN100455155C CN100455155C (en) | 2009-01-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021517800A Expired - Fee Related CN100455155C (en) | 2002-12-28 | 2002-12-28 | Cold cathode fluorescent lamp driver |
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| Country | Link |
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| CN (1) | CN100455155C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101868111A (en) * | 2009-04-15 | 2010-10-20 | 达瑞光电股份有限公司 | Luminous module capable of compensating current |
| CN101064983B (en) * | 2006-04-27 | 2010-12-15 | 马士科技有限公司 | Compact light-operated florescent lamp and light-operated circuit thereof |
| CN1794894B (en) * | 2004-12-25 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Driving device of cold-cathode fluorescent lamp |
| CN102869177A (en) * | 2012-09-10 | 2013-01-09 | 南昌大学 | Light intensity full-automatic stepless adjustment system of large-power high-voltage gas discharge lamp |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676961A (en) * | 1992-08-26 | 1994-03-18 | Matsushita Electric Works Ltd | Variable color lighting system |
| WO1999023456A1 (en) * | 1997-10-30 | 1999-05-14 | Baker Electronics, Inc. | Consistent brightness backlight system |
| US6104146A (en) * | 1999-02-12 | 2000-08-15 | Micro International Limited | Balanced power supply circuit for multiple cold-cathode fluorescent lamps |
-
2002
- 2002-12-28 CN CNB021517800A patent/CN100455155C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1794894B (en) * | 2004-12-25 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Driving device of cold-cathode fluorescent lamp |
| CN101064983B (en) * | 2006-04-27 | 2010-12-15 | 马士科技有限公司 | Compact light-operated florescent lamp and light-operated circuit thereof |
| CN101868111A (en) * | 2009-04-15 | 2010-10-20 | 达瑞光电股份有限公司 | Luminous module capable of compensating current |
| CN102869177A (en) * | 2012-09-10 | 2013-01-09 | 南昌大学 | Light intensity full-automatic stepless adjustment system of large-power high-voltage gas discharge lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100455155C (en) | 2009-01-21 |
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