CN100489926C - Light-source drive circuit, Luminescence device and balanced transformer with current feedback - Google Patents
Light-source drive circuit, Luminescence device and balanced transformer with current feedback Download PDFInfo
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- CN100489926C CN100489926C CNB200710091414XA CN200710091414A CN100489926C CN 100489926 C CN100489926 C CN 100489926C CN B200710091414X A CNB200710091414X A CN B200710091414XA CN 200710091414 A CN200710091414 A CN 200710091414A CN 100489926 C CN100489926 C CN 100489926C
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Abstract
The invention provides a light source driving circuit, a lighting device with current feedback and a balance transformer, where the lighting device comprises multiple light sources, power supply converting circuit, multiple load driving coils and feedback generating coil, where the power supply converting circuit generates drive signal to the load driving coils to generate the same drive current to drive each light source. Besides, the feedback generating coil induces the currents flowing through the load driving coils to generate feedback signal. And the invention can make the brightness of the light source reach the ideal set value.
Description
Technical field
The present invention is relevant for a kind of light-emitting device, and is particularly to a kind of light-emitting device with feedback function.
Background technology
Be the epoch of a 3C at present, epoch of computing machine (Computer), communication (Communication) and consumption electronic products (Consumer electronics) just.In the middle of such life, many a feast for the eyes information equipments are arranged on the market, for example digitization tools such as mobile phone, digital camera, digital code camera, notebook computer and desktop computer develop towards direction more convenient, multi-functional and attractive in appearance invariably.
In most information equipment, all be with flat-panel screens as main communication interface, by the Presentation Function of flat-panel screens, the user is more convenient in the operation of product.LCD is because of having power saving, high image quality, the high and low consumed power of space utilization efficient, advantageous characteristic such as radiationless, replaces cathode-ray tube display gradually and becomes the main flow in market.
Because display panels does not have luminous function, therefore, below display panels, must dispose backlight module, in order to high-quality and stable brilliant demonstration of light source feed flow to be provided.In addition, the design quality of backlight can directly have influence on the liquid crystal display quality, and wherein the fluorescent tube brightness of backlight quality and backlight module inside and uniformity coefficient have absolute correlativity.
A kind of drive unit of many fluorescent tubes is disclosed among the U.S. Patent number US6534934 B1.In this patent, the principle of work of the drive unit of many fluorescent tubes is flow equalizing circuits of forming by passive device, reaches the purpose of lamp tube current equalizing.Yet this flow equalizing circuit may produce the unmatched problem of multiple passive device characteristic error amount, and its feedback system is for directly to extract feedback signal in certain single fluorescent tube low-pressure side.Therefore, this feedback system also can't be fed back at many groups fluorescent tube simultaneously, will cause the lamp current amount of feedback extraction point and the fluorescent tube of other groups to produce error, and causes producing between fluorescent tube uneven flow phenomenon, produces problems such as backlight uniformity coefficient deficiency.In addition, all flow structure and feedback system will significantly promote the design cost of transverter, and quite expend the usable floor area of printed circuit board (PCB).
A kind of drive unit of many fluorescent tubes is disclosed among the U.S. Patent number US6717372 B2 in addition.In this patent, the drive unit of many fluorescent tubes is flow equalizing circuits of being formed by the magnetic ferromagnetic element, to reach the purpose of lamp tube current equalizing.Similarly, in this patent, do not feed back the ability of lamp current, also as the existing problem of US6534934 B1 patent yet.
Summary of the invention
Because problems of the prior art the object of the present invention is to provide a kind of balanced type transformer, can produce feedback current.
Another object of the present invention is to provide a kind of back lighting device, utilize lower hardware cost and can have the control of feedback function.
Another object of the present invention is to provide a kind of light source driving circuit, can a plurality of light sources of driven in synchronism.
The present invention proposes a kind of light source driving circuit, is suitable for a plurality of light sources of driven in synchronism.Light source driving circuit provided by the present invention comprises power-switching circuit, a plurality of load driving coil and feedback generation coil; Wherein, power-switching circuit transmits drive signal to a plurality of load driving coils, and a plurality of load driving coil is according to this drive signal, correspondingly respectively drives a plurality of light sources.The feedback generation coil, in order to induced flow through the electric current of a plurality of load driving coils and produce feedback signal to power-switching circuit.In addition, a plurality of load driving coils are for being total to core construction.
According to embodiments of the invention, the number of turns of above-mentioned a plurality of load driving coils is identical.
According to embodiments of the invention, above-mentioned feedback generation coil and a plurality of load driving coil are for being total to core construction.
According to embodiments of the invention, the number of above-mentioned a plurality of load driving coils is an even number.
According to embodiments of the invention, above-mentioned a plurality of load driving coils are identical with the number of turns of feedback generation coil.
According to embodiments of the invention, the number of turns of above-mentioned a plurality of load driving coils and feedback generation coil is different.
According to embodiments of the invention, above-mentioned power-switching circuit comprises power circuit and transformer.Power circuit is suitable for electric connection of power supply, and transformer has side and secondary side, and wherein a side is coupled to power circuit, and the secondary side is output drive signal then.
The present invention proposes a kind of light-emitting device, comprises a plurality of first light sources, first power-switching circuit, a plurality of first load driving coil and the first feedback generation coil; Wherein, first power-switching circuit is in order to produce a plurality of first light sources of first drive, a plurality of first load driving coils are for being total to core construction, and first termination of each first load driving coil is received first drive signal, its second end then respectively correspondence couple a plurality of first light sources one of them.The electric current of the coil-induced a plurality of first load driving coils of flowing through of first feedback generation and produce feedback signal to power-switching circuit.
According to embodiments of the invention, the above-mentioned first feedback generation coil and a plurality of first load driving coil are for being total to core construction.
According to embodiments of the invention, the number of turns of above-mentioned a plurality of load driving coils is different.
According to embodiments of the invention, the number of above-mentioned a plurality of load driving coils is an even number.
According to embodiments of the invention, the number of turns of above-mentioned a plurality of load driving coils and feedback generation coil is different.
According to embodiments of the invention, above-mentioned power-switching circuit comprises power circuit and transformer.Power circuit is suitable for electric connection of power supply, and transformer has side and secondary side, and wherein a side is coupled to power circuit, and the secondary side is output drive signal then.
According to embodiments of the invention, above-mentioned light-emitting device also comprises feedback circuit and control module; Wherein, the feedback circuit receiving feedback signals, and control module is according to the output of feedback circuit, in order to control first power-switching circuit and to adjust first drive signal.
According to embodiments of the invention, above-mentioned light-emitting device also comprises the second source change-over circuit, is suitable for electric connection of power supply, and produces second drive signal according to the output of control module.
According to embodiments of the invention, above-mentioned light-emitting device also comprises a plurality of secondary light sources, a plurality of second load driving coil and the second feedback generation coil; Wherein, a plurality of second load driving coils are core construction altogether, and first termination of a plurality of second load driving coils is received second drive signal, its second end then respectively correspondence couple a plurality of secondary light sources one of them.The second feedback generation coil and a plurality of second load driving coil are for being total to core construction, wherein first end of first end of the second feedback generation coil and the first feedback generation coil is coupled to feedback circuit jointly, and second end of second end of the first feedback generation coil and the second feedback generation coil couples each other, so that feedback signal is delivered to feedback circuit.
According to embodiments of the invention, the number of the above-mentioned second load driving coil is an even number.
According to embodiments of the invention, above-mentioned light-emitting device also comprises a plurality of the 3rd load driving coils and the 3rd feedback generation coil; Wherein, a plurality of the 3rd load driving coils are for being total to core construction, first termination of a plurality of the 3rd load driving coils is received second drive signal, its second end then respectively correspondence couple a plurality of first light sources one of them, and be disposed at the two ends of a plurality of light sources respectively with a plurality of first load driving coils.The 3rd feedback generation coil and a plurality of the 3rd load driving coil are for being total to core construction, wherein first end of the 3rd feedback generation coil is coupled to second end of the first feedback generation coil, second end of the 3rd feedback generation coil then is coupled to feedback circuit jointly with first end of the first feedback generation coil, so that feedback signal is delivered to feedback circuit.
According to embodiments of the invention, the number of above-mentioned the 3rd load driving coil is an even number.
According to embodiments of the invention, above-mentioned a plurality of the 3rd load driving coils export the signal of a plurality of first light sources to, and the signal that exports a plurality of first light sources to a plurality of first load driving coils is anti-phase.
The present invention also provides a kind of balanced type transformer, in order to adjust the load current of driving circuit.Balanced type transformer of the present invention comprises first coil, second coil and tertiary coil; Wherein, first termination of first coil is received drive signal, and second end is coupled to first load, and first termination of second coil is received drive signal, second end is coupled to second load, and tertiary coil produces feedback signal to driving circuit in order to the electric current of responding to first coil and second coil and being passed through.
According to embodiments of the invention, above-mentioned first coil, second coil and tertiary coil are structure unshakable in one's determination altogether.
According to embodiments of the invention, the number of turns of above-mentioned first coil, second coil is identical.
According to embodiments of the invention, the number of turns of above-mentioned first coil, second coil and tertiary coil is identical.
According to embodiments of the invention, the number of turns of above-mentioned first coil, second coil and tertiary coil is different.
Balanced type transformer of the present invention has feedback function, and by design altogether unshakable in one's determination, make electromagnetism on the iron circuit logical interact and a plurality of loading coil between the coupling of magnetic interlinkage so that the load current equal and opposite in direction of each loading coil of flowing through.In addition, the balanced type transformer comprises the feedback generation coil, and by the through-flow moving energy of responding to other coils of electromagnetism, and the output feedback current is adjusted to the desired electrical flow valuve by control module with the feedback current value, makes the brightness of light source reach ideal set value.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
Description of drawings
Fig. 1 is a kind of circuit diagram with driving circuit of FEEDBACK CONTROL according to the preferred embodiments of the present invention.
Fig. 2 is for having the circuit diagram of the driving circuit of FEEDBACK CONTROL according to another kind of the present invention.
Fig. 3 is the circuit diagram according to the light-emitting device of the preferred embodiments of the present invention.
Fig. 4 is the circuit diagram according to another light-emitting device of the present invention.
Fig. 5 is the circuit diagram according to another light-emitting device of the present invention.
Wherein, description of reference numerals is as follows:
100,200,318,412,422,512,522: the balanced type transformer
101,103,105,201,203,307,309: coil
110,112,210: load
300,400,500: light-emitting device
302,406,408,508: light source
305,410,420,510,520: light source driving circuit
310,414,424,514,524: power-switching circuit
312,416,426,516,526: power circuit
314,418,428,518,528: transformer
322,434,534: feedback circuit
324,430,530: control module
I1a, I1b, I2a～I2n, I3a～I3n, I4a～I4h, I5a～I5h, Iin1, Iin2, Iin3, If1, If2, If3, If4: electric current
N1, N2, N3, N4, N5, N6: node
Embodiment
Fig. 1 is a kind of circuit diagram with driving circuit of FEEDBACK CONTROL according to the preferred embodiments of the present invention.Please refer to Fig. 1, the driving circuit that present embodiment provided comprises balanced type transformer 100.Balanced type transformer 100 can be according to drive signal I
In1Come a plurality of loads of driven in synchronism, for example load 110 and 112.In the present embodiment, drive signal I
In1For example be the form of electric current, can by power-switching circuit (such as Fig. 3 314) generation.
In the time will driving load 110 and 112, but input drive signal I
In1To node N1, and drive signal I
In1Can flow to coil 101 and 103 via node N1.Because coil 101 is identical with the number of turns of coil with 103 magnetizing inductance value, and has magnetic interlinkage coupled characteristic between coil 101 and 103, so the load current I of flow through load 110 and 112
1aAnd I
1bSize is identical, i.e. I
1a=I
1bState during for balance.At this moment, there is electromagnetism through-flow moving in the iron core of transformer 100, makes the logical meeting of electromagnetism produce induced potentials and export feedback current I at coil 105
F1
In addition, the induced potential size responded to of coil 105 is relevant with the number of turns of coil 105.Therefore, the user can adjust the size of induced potential according to its demand by the number of turns that increases or reduce coil 105.
Fig. 2 is for having the circuit diagram of the driving circuit of FEEDBACK CONTROL according to another kind of the present invention.Please refer to Fig. 2, the driving circuit that present embodiment provided comprises balanced type transformer 200.Balanced type transformer 200 can be according to drive signal I
In2Come a plurality of loads 210 of driven in synchronism.In the present embodiment, drive signal I
In2For example be the form of electric current, can by power-switching circuit (such as Fig. 3 310) generation.
Because for meeting the magnetic circuit principle, therefore, the number of coil 201 is necessary for even number to balanced type transformer 200 when design.In the present embodiment, be one group with two coils, and the air gap of each group coil is identical, and the magnetizing inductance value of each coil is identical with wire circle.In addition, present embodiment does not also limit the number of turns ratio of coil 201 and 203.
Please merge and see figures.1.and.2, balanced type transformer 100 and balanced type transformer 200 have identical functions, the relation of coupling and the element function of the coil 203 that balanced type transformer 200 comprises contrast to coil 105, and the relation of coupling of node N5 and N6 contrasts to node N2 and N3.
As input drive signal I
In2When flowing through a plurality of coil 201, because the magnetizing inductance value of each coil is identical with wire circle, and has magnetic interlinkage coupled characteristic between a plurality of coil 201, so drive signal I
In2Mean allocation is in each load, the load current I of the load 210 of promptly flowing through
2a～I
2nSize is identical.At this moment, have electromagnetism through-flow moving in the iron core of transformer 200, this electromagnetism is logical can to produce induced potential at coil 203, and output feedback current I
F2In addition, the coil number of the balanced type transformer 200 of present embodiment can illustrate by following formula:
W＝N+1 (1)
Lamp?number＝N (2)
Wherein, W is the coil number that balanced type voltage device 200 comprises, and N is the coil number that balancing transformer 200 is coupled to load 210, and Lamp number is for driving the number of load 210 simultaneously.In the present embodiment, N is the integer greater than 1.
It below is the explanation of the preferred embodiment of above-mentioned driving circuit.Fig. 3 is the circuit diagram according to the light-emitting device of the preferred embodiments of the present invention.Please refer to Fig. 3, light-emitting device 300 comprises a plurality of light sources 302 and light source driving circuit 305.Light source driving circuit 305 is in order to driving each light source, and light source 302 for example is a fluorescent tube.
Light source driving circuit 305 comprises power-switching circuit 310 and balanced type transformer 318.Balanced type transformer 318 can realize that it comprises a plurality of load driving coils 309 and feedback generation coil 307 with Fig. 2.Please merge with reference to Fig. 2 and Fig. 3, balanced type transformer 318 has identical functions with balanced type transformer 200, the relation of coupling and the element function of the feedback generation coil 307 that balanced type transformer 318 comprises contrast to coil 203, the relation of coupling and the element function of a plurality of load driving coils 309 contrast to coil 201, and the number of turns of each load driving coil is all identical.
In the present embodiment, a plurality of load driving coils 309 are to be total to core construction, and the number of load driving coil 309 is an even number.In addition, the present invention does not also limit the number of turns of a plurality of loading coils 309 and feedback generation coil 307.
When wanting driving light source 302, power-switching circuit 310 can produce drive signal I
In3, and by a plurality of load driving coils 309 each light source of driving.But feedback generation coil 307 induced flows are through the load current I of a plurality of load driving coils 309
3a～I
3n, and produce feedback current I
F3Because the magnetizing inductance value of each loading coil is identical with wire circle, and has magnetic interlinkage coupled characteristic between a plurality of loading coil 309, so load current I
3a=I
3b=...=I
3nThus, the drive current of each light source size can equate, makes each light source produce identical brightness.
Power-switching circuit 310 comprises power circuit 312 and transformer 314.The power circuit 312 of present embodiment is suitable for electric connection of power supply, and transformer 314 has side and secondary side, wherein a side is coupled to power circuit 312, make power supply can transmit electric energy to transformer 314, the secondary side output drive signal by transformer 314 is to balanced type transformer 318.
Please continue with reference to Fig. 3, the light-emitting device 300 of present embodiment also can comprise feedback circuit 322 and control module 324.Feedback circuit 322 is coupled to the two ends of feedback generation coil 307, in order to receive feedback current I
F3Feedback circuit 322 can be with feedback current I
F3Be sent to control module 324, and control module 324 can be with this feedback current I
F3Compare with the desired electrical flow valuve.If this feedback current I
F3Be higher than the desired electrical flow valuve, then turn down feedback current I
F3Size of current.Relative, if this feedback current I
F3Be lower than the desired electrical flow valuve, then need heighten feedback current I
F3Size of current, and adjusted electric current is sent to power-switching circuit 310.Thus, power-switching circuit 310 can produce new drive signal according to adjusted electric current and come driving light source 302, makes the brightness of light source 302 reach ideal set value.
Fig. 4 is the circuit diagram according to another light-emitting device of the present invention.Please refer to Fig. 4, light-emitting device 400 comprises a plurality of light sources 406 and 408, light source driving circuit 410 and 420, control module 430 and feedback circuit 434.Specifically, present embodiment utilizes two light source driving circuits 410 and 420 to drive two groups of light sources 406 and 408.
Please merge with reference to Fig. 3 and Fig. 4, light source driving circuit 410 and 420 and light source driving circuit 305 have identical functions, the relation of coupling of light source driving circuit 410 and 420 power-switching circuits that comprised 414 and 424 contrasts to power-switching circuit 310 with the element function, and balanced type transformer 418 and 428 the relation of coupling contrast to balanced type transformer 318 with the element function.The relation of coupling of power-switching circuit 414 and 424 power circuits that comprised 416 and 426 contrasts to power circuit 312 with the element function, and transformer 418 and 428 the relation of coupling contrast to transformer 314 with the element function.In addition, the relation of coupling of control module 430 and feedback circuit 434 contrasts respectively to control module 324 and feedback circuit 322 with the element function.
In the present embodiment, by light source driving circuit 410 and 420 in order to drive eight light sources.Yet, it will be understood by those skilled in the art that balanced type transformer 412 and 422 can distinguish driving N group light source; As shown in Figure 2, wherein N is a integer greater than 1.According to the explanation of Fig. 3, load current I
4a～I
4hSize of current can be identical, i.e. I
4aI
4b=...=I
4h
Please continue with reference to Fig. 4, in the present embodiment, the feedback generation coil of balanced type transformer 412 and 422 be connected according to its polarity dots, and be coupled to feedback circuit 434, form the loop of feedback signal.When arbitrary balanced type transformer produces feedback current I
F4The time, then can be through loop thus with feedback current I
F4Be sent to feedback circuit 434.Feedback circuit 434 can be with feedback current I
F4Be sent to control module 430, by control module 430 with this feedback current I
F4Be adjusted to the desired electrical flow valuve.Control module 430 can be sent to power-switching circuit 414 and 424 respectively with adjusted electric current.Thus, power-switching circuit 414 and 424 can produce new drive signal respectively according to adjusted electric current and come driving light source 406 and 408, makes the brightness of light source 406 and 408 reach ideal set value.
Fig. 5 is the circuit diagram according to another light-emitting device of the present invention.Please refer to Fig. 5, light-emitting device 500 comprises a plurality of light sources 508, light source driving circuit 510 and 520, control module 530 and feedback circuit 534.
Please merge with reference to Fig. 4 and Fig. 5, light source driving circuit 510 and 520 and light source driving circuit 410 and 420 have identical functions, the relation of coupling of light source driving circuit 510 and 520 power-switching circuits that comprised 514 and 524 contrasts to power-switching circuit 414 and 424 with the element function, and balanced type transformer 512 and 522 the relation of coupling contrast to balanced type transformer 412 and 422 with the element function.The relation of coupling of power-switching circuit 414 and 424 power circuits that comprised 516 and 526 contrasts to power circuit 416 and 426 with the element function, and transformer 518 and 528 the relation of coupling contrast to transformer 418 and 428 with the element function.In addition, the relation of coupling of control module 530 and feedback circuit 534 contrasts respectively to control module 430 and feedback circuit 434 with the element function.
It should be noted that a plurality of light sources 508 are disposed between two balanced type transformers 512 and 522, and the load current I that provided of balanced type transformer 512
5a～I
5dThe load current I that is provided with balanced type transformer 522
5e～I
5hFor anti-phase.In addition, structure by present embodiment, not only can guarantee the load current equal and opposite in direction of each light source, and the mutual collocation by tickler can reach the purpose of integrating the analog feedback current signal, make both-end light source driving circuit 510 and 520 s' output energy even.
In sum, balanced type transformer of the present invention has feedback function, and by design altogether unshakable in one's determination, make electromagnetism on the iron circuit logical interact and a plurality of loading coil between the coupling of magnetic interlinkage so that the load current equal and opposite in direction of each loading coil of flowing through.In addition, the balanced type transformer comprises the feedback generation coil, answers the energy of other coils by the through-flow innervation of electromagnetism, and exports feedback current, by control module the feedback current value is adjusted to the desired electrical flow valuve, makes the brightness of light source reach ideal set value.
Though the present invention with preferred embodiment openly as above; right its is not in order to restriction the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little change and modification, so protection scope of the present invention is as the criterion when looking the scope that the accompanying Claim book defined.
Claims (25)
1. a light source driving circuit is suitable for a plurality of light sources of driven in synchronism, and this light source driving circuit comprises:
Power-switching circuit is in order to produce drive signal;
A plurality of load driving coils in order to receiving this drive signal, and correspondingly respectively drive described light source, and described load driving coil is core construction altogether; And
The feedback generation coil, in order to induced flow through the electric current of described load driving coil and produce feedback signal to this power-switching circuit.
2. light source driving circuit as claimed in claim 1, the number of turns of wherein said load driving coil is identical.
3. light source driving circuit as claimed in claim 1, wherein this feedback generation coil and described load driving coil are for being total to core construction.
4. light source driving circuit as claimed in claim 1, the number of wherein said load driving coil are even number.
5. light source driving circuit as claimed in claim 1, wherein said load driving coil is identical with the number of turns of this feedback generation coil.
6. light source driving circuit as claimed in claim 1, the number of turns of wherein said load driving coil and this feedback generation coil is different.
7. light source driving circuit as claimed in claim 1, wherein said light source are fluorescent tube.
8. light source driving circuit as claimed in claim 1, wherein this power-switching circuit comprises:
Power circuit is suitable for being electrically connected to power supply; And
Transformer has side and secondary side, and wherein this side couples this power circuit, and this secondary side is then exported this drive signal.
9. light-emitting device comprises:
A plurality of first light sources;
First power-switching circuit is in order to produce first drive signal to drive described first light source;
A plurality of first load driving coils are core construction altogether, and first termination of each first load driving coil is received this first drive signal, its second end respectively correspondence couple described first light source one of them;
The first feedback generation coil, induced flow are through the electric current of the described first load driving coil and produce feedback signal to this power-switching circuit;
Feedback circuit receives this feedback signal; And
Control module is controlled this first power-switching circuit according to the output of this feedback circuit and is adjusted this first drive signal.
10. light-emitting device as claimed in claim 9, wherein this first feedback generation coil and the described first load driving coil are for being total to core construction.
11. light-emitting device as claimed in claim 9, the number of turns of the wherein said first load driving coil is different.
12. light-emitting device as claimed in claim 9, the number of the wherein said first load driving coil are even number.
13. light-emitting device as claimed in claim 9, the number of turns of the wherein said first load driving coil and this first feedback generation coil is different.
14. light-emitting device as claimed in claim 9, wherein said first light source is a fluorescent tube.
15. light-emitting device as claimed in claim 9, wherein this first power-switching circuit comprises:
Power circuit is suitable for the electrical connection source; And
Transformer has side and secondary side, and wherein this side couples this power circuit, and this secondary side is then exported this first drive signal.
16. light-emitting device as claimed in claim 9 also comprises the second source change-over circuit, is suitable for being electrically connected this power supply, and produces second drive signal according to the output of this control module.
17. light-emitting device as claimed in claim 9 also comprises:
A plurality of secondary light sources;
A plurality of second load driving coils are core construction altogether, and first termination of each second load driving coil is received this second drive signal, its second end respectively correspondence couple described secondary light source one of them; And
The second feedback generation coil, with the described second load driving coil is to be total to core construction, wherein first end of first end of this second feedback generation coil and this first feedback generation coil is coupled to this feedback circuit jointly, second end of second end of this first feedback generation coil and this second feedback generation coil couples each other, so that this feedback signal is delivered to this feedback circuit.
18. light-emitting device as claimed in claim 17, the number of the wherein said second load driving coil are even number.
19. light-emitting device as claimed in claim 17 also comprises:
A plurality of the 3rd load driving coils, for being total to core construction, first termination of each the 3rd load driving coil is received this second drive signal, its second end respectively correspondence couple described first light source one of them, and be disposed at the two ends of described light source respectively with the described first load driving coil; And
The 3rd feedback generation coil, with described the 3rd load driving coil is to be total to core construction, wherein first end of the 3rd feedback generation coil is coupled to second end of this first feedback generation coil, second end of the 3rd feedback generation coil then is coupled to this feedback circuit jointly with first end of this first feedback generation coil, so that this feedback signal is delivered to this feedback circuit.
20. light-emitting device as claimed in claim 19, the number of wherein said the 3rd load driving coil are even number.
21. light-emitting device as claimed in claim 19, wherein said the 3rd load driving coil export the signal of described first light source to and signal that the described first load driving coil exports described first light source to is anti-phase.
22. a balanced type transformer in order to adjust the load current of driving circuit, comprising:
First coil, its first termination is received drive signal, and second end is coupled to first load;
Second coil, its first termination is received this drive signal, and second end is coupled to second load; And
Tertiary coil produces feedback signal to this driving circuit in order to respond to the electric current that this first coil and second coil passed through,
Wherein this first coil, this second coil and this tertiary coil are structure unshakable in one's determination altogether.
23. balanced type transformer as claimed in claim 22, wherein this first coil is identical with the number of turns of this second coil.
24. balanced type transformer as claimed in claim 22, wherein the number of turns of this first coil, this second coil and this tertiary coil is identical.
25. balanced type transformer as claimed in claim 22, wherein the number of turns of this first coil, this second coil and this tertiary coil is different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710091414XA CN100489926C (en) | 2007-03-28 | 2007-03-28 | Light-source drive circuit, Luminescence device and balanced transformer with current feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710091414XA CN100489926C (en) | 2007-03-28 | 2007-03-28 | Light-source drive circuit, Luminescence device and balanced transformer with current feedback |
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| CN101034522A CN101034522A (en) | 2007-09-12 |
| CN100489926C true CN100489926C (en) | 2009-05-20 |
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| CN107373927A (en) * | 2017-07-20 | 2017-11-24 | 京东方科技集团股份有限公司 | A kind of Intelligent decorative chain and its data processing method |
| CN115731846A (en) * | 2021-09-02 | 2023-03-03 | 深圳市洲明科技股份有限公司 | Light emitting diode display panel, driving system thereof and display device |
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