CN102685966B - A kind of constant-current circuit and light fixture - Google Patents
A kind of constant-current circuit and light fixture Download PDFInfo
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- CN102685966B CN102685966B CN201110057302.9A CN201110057302A CN102685966B CN 102685966 B CN102685966 B CN 102685966B CN 201110057302 A CN201110057302 A CN 201110057302A CN 102685966 B CN102685966 B CN 102685966B
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- power supply
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Abstract
The present invention is applicable to field of lighting devices, particularly relates to a kind of constant-current circuit and light fixture.The sampling resistor that constant-current circuit comprises DC/DC conversion module, the current regulator be connected with the positive pole of load and is connected with the negative pole of load.In embodiments of the present invention, by changing the resistance of sampling resistor, load current size can be arbitrarily set as required.
Description
Technical field
The invention belongs to field of lighting devices, particularly relate to a kind of constant-current circuit and light fixture.
Background technology
Fig. 1 is the structure of existing constant-current circuit, and constant-current circuit comprises DC/DC conversion module and constant flow module, and stabilized input voltage a value, then is made by constant flow module the current constant flowing through load by DC/DC conversion module.
But the shortcoming that this constant-current circuit exists is the specification that its reference constant current is limited by constant flow module, and size of current can not arbitrarily be arranged as required.
Summary of the invention
The object of the present invention is to provide a kind of constant-current circuit, be intended to solve present constant-current circuit and there is the problem that size of current can not arbitrarily arrange as required.
The present invention is achieved in that a kind of constant-current circuit, and described constant-current circuit comprises:
DC/DC conversion module, the current regulator be connected with the positive pole of load and the sampling resistor be connected with the negative pole of load;
The input termination DC power supply of described DC/DC conversion module, exports termination current regulator, and sampling resistor described in feedback termination, for the load current of sampling according to described sampling resistor, controls described current regulator regulating load electric current.
Another object of the present invention is to provide a kind of light fixture, and described light fixture comprises constant-current circuit, and described constant-current circuit comprises:
DC/DC conversion module, the current regulator be connected with the positive pole of load and the sampling resistor be connected with the negative pole of load;
The input termination DC power supply of described DC/DC conversion module, exports termination current regulator, and sampling resistor described in feedback termination, for the load current of sampling according to described sampling resistor, controls described current regulator regulating load electric current.
In the present invention, the sampling resistor that constant-current circuit comprises DC/DC conversion module, the current regulator be connected with the positive pole of load and is connected with the negative pole of load, by changing the resistance of sampling resistor, can arbitrarily arrange load current size as required.
Accompanying drawing explanation
Fig. 1 is the module map of the constant-current circuit that the embodiment of the present invention provides;
Fig. 2 is the exemplary circuit figure of the constant-current circuit that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows the modular structure of the constant-current circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows.
The sampling resistor R2 that constant-current circuit comprises DC/DC conversion module 100, the current regulator 200 be connected with the positive pole of load and is connected with the negative pole of load;
The input termination DC power supply of DC/DC conversion module 100, exports termination current regulator 200, and feedback termination sampling resistor R2, for the load current of sampling according to sampling resistor R2, controls current regulator 200 regulating load electric current.
Fig. 2 shows the exemplary circuit structure of the constant-current circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows.
As one embodiment of the present invention, DC/DC conversion module 100 comprises:
DC/DC conversion chip U1, current-limiting resistance R1 and sequential electric capacity C1;
The driving tube collector terminal DRV COLL of DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the load peak current test side IPK of DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the power end VCC of DC/DC conversion chip U1 connects DC power supply, the switching tube collector terminal SW COLL of DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the timing capacitor end TIM CAP of DC/DC conversion chip U1 is by sequential electric capacity C1 ground connection, the ground end GND ground connection of DC/DC conversion chip U1, the switching tube emitter terminal SW EM of DC/DC conversion chip U1 connects current regulator 200, the comparator inverting input IN of DC/DC conversion chip U1 connects the negative pole of load and the link of sampling resistor R2.As one embodiment of the present invention, DC/DC conversion chip U1 can adopt 34063 model chip.
As one embodiment of the present invention, current regulator 200 comprises:
Inductance L 1, sustained diode 1 and electrochemical capacitor C2;
The switching tube emitter terminal SW EM of one termination DC/DC conversion chip U1 of inductance L 1, the positive pole of another terminating load of inductance L 1, the negative electrode of sustained diode 1 meets the switching tube emitter terminal SW EM of DC/DC conversion chip U1, the plus earth of sustained diode 1, electrochemical capacitor C2 is connected between load positive pole and ground.
As one embodiment of the present invention, DC power supply is rectifier U2, the ac input end AC of rectifier U2 connects AC power, the positive output end V+ of rectifier U2 meets DC/DC conversion chip U1, the positive output end V+ of rectifier U2 passes through electric capacity C3 ground connection, the negative output terminal V-ground connection of rectifier U2 simultaneously.
Sampling resistor R2 samples load current, load current is converted to the comparator inverting input IN that voltage signal is input to DC/DC conversion chip U1, compare with the benchmark of inside, regulated the energy storage of inductance L 1 by the duty ratio changing switching tube emitter terminal SW EM output signal according to the result compared, indirect regulation flows through the electric current of load, by changing the resistance of sampling resistor R2, load current size can be arbitrarily set as required.
The light fixture that another embodiment of the present invention also provides one to comprise above-mentioned constant-current circuit.
In embodiments of the present invention, the sampling resistor that constant-current circuit comprises DC/DC conversion module, the current regulator be connected with the positive pole of load and is connected with the negative pole of load, by changing the resistance of sampling resistor, load current size can be arbitrarily set as required.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a constant-current circuit, is characterized in that, described constant-current circuit comprises:
DC/DC conversion module, the current regulator be connected with the positive pole of load and the sampling resistor be connected with the negative pole of load, change the resistance of sampling resistor, arrange load current;
The input termination DC power supply of described DC/DC conversion module, exports termination current regulator, and sampling resistor described in feedback termination, for the load current of sampling according to described sampling resistor, controls described current regulator regulating load electric current;
DC power supply is rectifier U2, and the ac input end AC of rectifier U2 connects AC power, and the positive output end V+ of rectifier U2 connects DC/DC conversion module, and the positive output end V+ of rectifier U2 passes through electric capacity C3 ground connection, the negative output terminal V-ground connection of rectifier U2 simultaneously;
Described DC/DC conversion module comprises:
DC/DC conversion chip U1, current-limiting resistance R1 and sequential electric capacity C1, DC/DC conversion chip U1 can adopt 34063 model chip;
The driving tube collector terminal of described DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the load peak current test side of described DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the power supply termination DC power supply of described DC/DC conversion chip U1, the switching tube collector terminal of described DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the timing capacitor end of described DC/DC conversion chip U1 is by sequential electric capacity C1 ground connection, the ground end ground connection of described DC/DC conversion chip U1, the switching tube emitter termination current regulator of described DC/DC conversion chip U1, the negative pole of comparator anti-phase input termination load of described DC/DC conversion chip U1 and the link of sampling resistor,
Sampling resistor sampling load current, load current is converted to the comparator inverting input IN that voltage signal is input to DC/DC conversion chip U1, compare with the benchmark of inside, regulated the energy storage of current regulator by the duty ratio changing switching tube emitter terminal SW EM output signal according to the result compared, indirect regulation flows through the electric current of load, by changing the resistance of sampling resistor, load current size can be arbitrarily set as required.
2. constant-current circuit as claimed in claim 1, it is characterized in that, described current regulator comprises:
Inductance L 1, sustained diode 1 and electrochemical capacitor C2;
The switching tube emitter terminal of one termination DC/DC conversion chip U1 of described inductance L 1, the positive pole of another terminating load of described inductance L 1, the negative electrode of described sustained diode 1 connects the switching tube emitter terminal of DC/DC conversion chip U1, the plus earth of described sustained diode 1, described electrochemical capacitor C2 is connected between load positive pole and ground.
3. a light fixture, is characterized in that, described light fixture comprises constant-current circuit, and described constant-current circuit comprises:
DC/DC conversion module, the current regulator be connected with the positive pole of load and the sampling resistor be connected with the negative pole of load, change the resistance of sampling resistor, arrange load current;
The input termination DC power supply of described DC/DC conversion module, exports termination current regulator, and sampling resistor described in feedback termination, for the load current of sampling according to described sampling resistor, controls described current regulator regulating load electric current;
DC power supply is rectifier U2, and the ac input end AC of rectifier U2 connects AC power, and the positive output end V+ of rectifier U2 connects DC/DC conversion module, and the positive output end V+ of rectifier U2 passes through electric capacity C3 ground connection, the negative output terminal V-ground connection of rectifier U2 simultaneously;
Described DC/DC conversion module comprises:
DC/DC conversion chip U1, current-limiting resistance R1 and sequential electric capacity C1, DC/DC conversion chip U1 can adopt 34063 model chip;
The driving tube collector terminal of described DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the load peak current test side of described DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the power supply termination DC power supply of described DC/DC conversion chip U1, the switching tube collector terminal of described DC/DC conversion chip U1 connects DC power supply by current-limiting resistance R1, the timing capacitor end of described DC/DC conversion chip U1 is by sequential electric capacity C1 ground connection, the ground end ground connection of described DC/DC conversion chip U1, the switching tube emitter termination current regulator of described DC/DC conversion chip U1, the negative pole of comparator anti-phase input termination load of described DC/DC conversion chip U1 and the link of sampling resistor,
Sampling resistor sampling load current, load current is converted to the comparator inverting input IN that voltage signal is input to DC/DC conversion chip U1, compare with the benchmark of inside, regulated the energy storage of current regulator by the duty ratio changing switching tube emitter terminal SW EM output signal according to the result compared, indirect regulation flows through the electric current of load, by changing the resistance of sampling resistor, load current size can be arbitrarily set as required.
4. light fixture as claimed in claim 3, it is characterized in that, described current regulator comprises:
Inductance L 1, sustained diode 1 and electrochemical capacitor C2;
The switching tube emitter terminal of one termination DC/DC conversion chip U1 of described inductance L 1, the positive pole of another terminating load of described inductance L 1, the negative electrode of described sustained diode 1 connects the switching tube emitter terminal of DC/DC conversion chip U1, the plus earth of described sustained diode 1, described electrochemical capacitor C2 is connected between load positive pole and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110057302.9A CN102685966B (en) | 2011-03-10 | 2011-03-10 | A kind of constant-current circuit and light fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110057302.9A CN102685966B (en) | 2011-03-10 | 2011-03-10 | A kind of constant-current circuit and light fixture |
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| Publication Number | Publication Date |
|---|---|
| CN102685966A CN102685966A (en) | 2012-09-19 |
| CN102685966B true CN102685966B (en) | 2015-10-28 |
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| CN201110057302.9A Expired - Fee Related CN102685966B (en) | 2011-03-10 | 2011-03-10 | A kind of constant-current circuit and light fixture |
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| CN103887867A (en) * | 2014-03-28 | 2014-06-25 | 国网节能服务有限公司 | Method for providing electric power for electricity consumption facilities through expressway wind energy |
| CN111491421A (en) * | 2020-04-21 | 2020-08-04 | 深圳海令科技有限公司 | Festive lantern actuating system based on P L C-BUS technique |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200997705Y (en) * | 2007-01-09 | 2007-12-26 | 张建平 | High-brightness LED illuminating system |
| CN201114894Y (en) * | 2007-06-13 | 2008-09-10 | 王元成 | A LED driving circuit |
| CN201528453U (en) * | 2009-11-20 | 2010-07-14 | 鞠娣 | LED constant current source capable of half-power controlling |
| CN101827480A (en) * | 2010-04-30 | 2010-09-08 | 海洋王照明科技股份有限公司 | LED drive control circuit |
| CN101861005A (en) * | 2010-04-01 | 2010-10-13 | 海洋王照明科技股份有限公司 | LED drive circuit and portable lamp |
-
2011
- 2011-03-10 CN CN201110057302.9A patent/CN102685966B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200997705Y (en) * | 2007-01-09 | 2007-12-26 | 张建平 | High-brightness LED illuminating system |
| CN201114894Y (en) * | 2007-06-13 | 2008-09-10 | 王元成 | A LED driving circuit |
| CN201528453U (en) * | 2009-11-20 | 2010-07-14 | 鞠娣 | LED constant current source capable of half-power controlling |
| CN101861005A (en) * | 2010-04-01 | 2010-10-13 | 海洋王照明科技股份有限公司 | LED drive circuit and portable lamp |
| CN101827480A (en) * | 2010-04-30 | 2010-09-08 | 海洋王照明科技股份有限公司 | LED drive control circuit |
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| CN102685966A (en) | 2012-09-19 |
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