CN203072219U - LED driving power supply - Google Patents
LED driving power supply Download PDFInfo
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- CN203072219U CN203072219U CN 201320028440 CN201320028440U CN203072219U CN 203072219 U CN203072219 U CN 203072219U CN 201320028440 CN201320028440 CN 201320028440 CN 201320028440 U CN201320028440 U CN 201320028440U CN 203072219 U CN203072219 U CN 203072219U
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Abstract
The utility model discloses a LED driving power supply. The power supply comprises a power supply input terminal, an EMI filtering unit, a rectifier filtering unit, a voltage conversion unit and an output unit which are successively connected with each other. The output unit is connected with a voltage signal acquisition unit and a current signal acquisition unit respectively. The voltage signal acquisition unit and the current signal acquisition unit are connected to a PFC control unit respectively. The PFC control unit is connected with the voltage conversion unit through a switch unit. The voltage conversion unit and the rectifier filtering unit are connected to the PFC control unit respectively. The output unit is connected with a voltage stabilization protection unit. The voltage signal acquisition unit and the PFC control unit are connected through an optical coupler. The current signal acquisition unit and the PFC control unit are connected through the optical coupler. A voltage sampling signal amplifying circuit is arranged between the voltage conversion unit and the PFC control unit. The LED driving power supply can carry out precise adjustment on a working voltage and a current of the LED and a power factor is high.
Description
Technical field
The utility model relates to a kind of LED driving power, is specifically related to a kind of LED driving power.
Background technology
LED has advantages such as environmental protection, energy-conservation, life-span be long and is regarded as the 21 century lighting source, has now begun to replace conventional light source and has widely applied at various lightings.But, because the LED self character determines its driving power not adopt same power supply with ordinary incandescent lamp, thereby in order to avoid voltage fluctuation causes electric current to increase LED is damaged, thereby must design new power supply fully to satisfy the LED required driving requirement of working, thereby bring into play the performance of LED to greatest extent, reduce failure rate.
Yet the driveability of existing various LED driving powers is unsatisfactory, has influenced applying of LED.Existing LED driving power, at first the voltage to the power input input carries out voltage transformation, providing late-class circuit required voltage, and then links to each other with LED through directly passing through a current-limiting resistance behind the rectifying and wave-filtering.But this kind LED driving power can't be adjusted the operating current fluctuation at the LED two ends that cause because of external voltage fluctuation, when input voltage fluctuation is big even can cause LED to damage; Secondly, this kind LED driving power can't be adjusted causing that owing to reasons such as temperature the operating current that flows through LED changes; In addition, the same phasic property of the voltage and current of this kind LED driving power is relatively poor, and power factor is very low.
The utility model content
The purpose of this utility model is to provide a kind of LED driving power, and it can accurately be adjusted operating voltage and the electric current of LED, and the power factor height.
For achieving the above object, the technical solution of the utility model is a kind of LED driving power of design, comprises the power input, EMI filter unit, rectification filtering unit, voltage transformation module, the output unit that connect successively; Output unit is connected with voltage signal acquisition unit and current signal collecting unit respectively; Voltage signal acquisition unit and current signal collecting unit are connected to the PFC control unit respectively; The PFC control unit connects voltage transformation module by switch element; Voltage transformation module and rectification filtering unit also are connected to the PFC control unit respectively; Output unit is connected with protective circuit of voltage regulation.
Preferably, described voltage signal acquisition unit is connected by optical coupler with the PFC control unit.
Preferably, described current signal collecting unit is connected by optical coupler with the PFC control unit.
Preferably, be provided with the voltage sampling signal amplifying circuit between described voltage transformation module and PFC control unit.
Output unit is changed and delivered to the voltage of described voltage transformation module after to rectifying and wave-filtering;
The output of described output unit links to each other with load LED;
Described switch element is controlled the voltage transitions of described voltage transformation module according to its turn-on and turn-off;
Described PFC control unit produces a control signal and controls periodically turn-on and turn-off of described switch element;
Voltage signal acquisition unit and current signal collecting unit are gathered the signal of output unit respectively and are produced and feed back signal to the PFC control unit; Described PFC control unit is adjusted control signal according to described feedback signal, controls periodically turn-on and turn-off of described switch element, with the cycle of adjustment switch element turn-on and turn-off, thus the output of adjustment voltage transformation module.Realization makes load LED work more stable to the accurate adjustment of LED operating voltage and electric current, and power factor is also higher.In addition, the PFC control unit is also sampled to output, switch element, the voltage transformation module of rectification filtering unit, and according to sampled signal adjustment control signal, thereby LED operating current and raising power factor are further accurately adjusted in the output of adjustment voltage transformation module.
Advantage of the present utility model and beneficial effect are: a kind of LED driving power is provided, and it can accurately be adjusted operating voltage and the electric current of LED, and the power factor height.
Description of drawings
Fig. 1 is schematic diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection range of the present utility model with this.
The concrete technical scheme of implementing of the utility model is:
A kind of LED driving power comprises the power input 1, EMI filter unit 2, rectification filtering unit 3, voltage transformation module 4, the output unit 5 that connect successively; Output unit 5 is connected with voltage signal acquisition unit 61 and current signal collecting unit 62 respectively; Voltage signal acquisition unit 61 and current signal collecting unit 62 are connected to PFC control unit 7 respectively; PFC control unit 7 connects voltage transformation module 4 by switch element 8; Voltage transformation module 4 and rectification filtering unit 3 also are connected to PFC control unit 7 respectively.Described voltage signal acquisition unit 61 is connected by optical coupler 9 with PFC control unit 7.Described current signal collecting unit 62 is connected by optical coupler 9 with PFC control unit 7.7 of described voltage transformation module 4 and PFC control units are provided with voltage sampling signal amplifying circuit 10; Output unit 5 is connected with protective circuit of voltage regulation 11.
The output of described output unit 5 links to each other with load LED;
Described switch element 8 is controlled the voltage transitions of described voltage transformation module 4 according to its turn-on and turn-off;
Described PFC control unit 7 produces a control signal and controls periodically turn-on and turn-off of described switch element 8;
Voltage signal acquisition unit 61 and current signal collecting unit 62 are gathered the signal of output unit 5 respectively and are produced and feed back signal to PFC control unit 7; Described PFC control unit 7 is adjusted control signal according to described feedback signal, controls periodically turn-on and turn-off of described switch element 8, with the cycle of adjustment switch element 8 turn-on and turn-off, thus the output of adjustment voltage transformation module 4.Realization makes load LED work more stable to the accurate adjustment of LED operating voltage and electric current, and power factor is also higher.In addition, PFC control unit 7 is also sampled to output, switch element 8, the voltage transformation module 4 of rectification filtering unit 3, and according to sampled signal adjustment control signal, thereby LED operating current and raising power factor are further accurately adjusted in the output of adjustment voltage transformation module 4.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (4)
1. a LED driving power is characterized in that, comprises the power input, EMI filter unit, rectification filtering unit, voltage transformation module, the output unit that connect successively; Output unit is connected with voltage signal acquisition unit and current signal collecting unit respectively; Voltage signal acquisition unit and current signal collecting unit are connected to the PFC control unit respectively; The PFC control unit connects voltage transformation module by switch element; Voltage transformation module and rectification filtering unit also are connected to the PFC control unit respectively; Output unit is connected with protective circuit of voltage regulation.
2. LED driving power according to claim 1 is characterized in that, described voltage signal acquisition unit is connected by optical coupler with the PFC control unit.
3. LED driving power according to claim 1 is characterized in that, described current signal collecting unit is connected by optical coupler with the PFC control unit.
4. LED driving power according to claim 1 is characterized in that, is provided with the voltage sampling signal amplifying circuit between described voltage transformation module and PFC control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320028440 CN203072219U (en) | 2013-01-04 | 2013-01-04 | LED driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320028440 CN203072219U (en) | 2013-01-04 | 2013-01-04 | LED driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203072219U true CN203072219U (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320028440 Expired - Fee Related CN203072219U (en) | 2013-01-04 | 2013-01-04 | LED driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203072219U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
-
2013
- 2013-01-04 CN CN 201320028440 patent/CN203072219U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20150104 |
|
| EXPY | Termination of patent right or utility model |