CN203015238U - Off-line LED driving power supply - Google Patents
Off-line LED driving power supply Download PDFInfo
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- CN203015238U CN203015238U CN 201320028453 CN201320028453U CN203015238U CN 203015238 U CN203015238 U CN 203015238U CN 201320028453 CN201320028453 CN 201320028453 CN 201320028453 U CN201320028453 U CN 201320028453U CN 203015238 U CN203015238 U CN 203015238U
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Abstract
The utility model discloses an off-line LED driving power supply, comprising a power supply input terminal, an EMI filtering unit, a rectification filtering unit, a voltage transformation unit, and an output unit, which are sequentially connected. The output unit is respectively connected with a voltage signal acquisition unit and a current signal acquisition unit. The voltage signal acquisition unit and the current signal acquisition unit are respectively connected to a PFC control unit. The PFC control unit is connected to the voltage transformation unit through a switch unit. The voltage transformation unit and the rectification filtering unit are also respectively connected to the PFC control unit. The voltage signal acquisition unit is connected with the PFC control unit through an optical coupler, and the current signal acquisition unit is connected with the PFC control unit through another optical coupler. A voltage sampling signal amplification circuit is arranged between the voltage transformation unit and the PFC control unit. The off-line LED driving power supply is capable of accurately adjusting working voltage and current of an LED and has a high power factor.
Description
Technical field
The utility model relates to a kind of LED driving power, is specifically related to a kind of off-line type LED driving power.
Background technology
LED has the advantages such as environmental protection, energy-conservation, the life-span is long and is regarded as the 21 century lighting source, has now begun to replace conventional light source and has widely applied on various lightings.But, because determining its driving power, the LED self character can 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 required driving requirement of LED work, thereby bring into play to greatest extent the performance of LED, reduce failure rate.
Yet the driveability of existing various LED driving powers is unsatisfactory, has affected applying of LED.At first existing LED driving power carries out voltage transformation to the voltage of power input input, providing late-class circuit required voltage, and then is connected with LED through directly the passing through a current-limiting resistance after 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, even can cause LED to damage when input voltage fluctuation is larger; Secondly, this kind LED driving power can't be adjusted causing that due 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 off-line type LED driving power, and it can carry out accurate adjustment to operating voltage and the electric current of LED, and power factor is high.
For achieving the above object, the technical solution of the utility model is a kind of off-line type LED driving power of design, comprises the power input, rectification filtering unit, voltage transformation module, the output unit that connect successively; Output unit is connected with respectively voltage signal acquisition unit and current signal collecting unit; Voltage signal acquisition unit and current signal collecting unit are connected to respectively the PFC control unit; The PFC control unit connects voltage transformation module by switch element; Voltage transformation module and rectification filtering unit also are connected to respectively the PFC control unit.
Preferably, also be provided with the EMI filter unit between described power input and rectification filtering unit.
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 is connected 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 gather respectively the signal of output unit and produce 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.The accurate adjustment of realization to LED operating voltage and electric current makes load LED work more stable, 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 adjust control signal according to sampled signal, thereby adjust the output of voltage transformation module, further accurate adjustment LED operating current and raising power factor.
Advantage of the present utility model and beneficial effect are: a kind of off-line type LED driving power is provided, and it can carry out accurate adjustment to operating voltage and the electric current of LED, and power factor is high.
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 off-line type 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 respectively voltage signal acquisition unit 61 and current signal collecting unit 62; Voltage signal acquisition unit 61 and current signal collecting unit 62 are connected to respectively PFC control unit 7; 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 respectively PFC control unit 7.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 changed and delivered to voltage after 4 pairs of rectifying and wave-filterings of described voltage transformation module;
The output of described output unit 5 is connected 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 gather respectively the signal of output unit 5 and produce 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.The accurate adjustment of realization to LED operating voltage and electric current makes load LED work more stable, 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 adjust control signal according to sampled signal, thereby adjust the output of voltage transformation module 4, further accurate adjustment LED operating current and raising power factor.
The above is only 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 (5)
1. an off-line type LED driving power, is characterized in that, comprises the power input, rectification filtering unit, voltage transformation module, the output unit that connect successively; Output unit is connected with respectively voltage signal acquisition unit and current signal collecting unit; Voltage signal acquisition unit and current signal collecting unit are connected to respectively the PFC control unit; The PFC control unit connects voltage transformation module by switch element; Voltage transformation module and rectification filtering unit also are connected to respectively the PFC control unit.
2. off-line type LED driving power according to claim 1, is characterized in that, also is provided with the EMI filter unit between described power input and rectification filtering unit.
3. off-line type 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.
4. off-line type 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.
5. off-line type 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 201320028453 CN203015238U (en) | 2013-01-04 | 2013-01-04 | Off-line LED driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320028453 CN203015238U (en) | 2013-01-04 | 2013-01-04 | Off-line LED driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203015238U true CN203015238U (en) | 2013-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320028453 Expired - Fee Related CN203015238U (en) | 2013-01-04 | 2013-01-04 | Off-line LED driving power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN203015238U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507239A (en) * | 2015-01-06 | 2015-04-08 | 宁波江北华瑞电子有限公司 | General energy-saving LED (light-emitting diode) drive power supply device |
-
2013
- 2013-01-04 CN CN 201320028453 patent/CN203015238U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507239A (en) * | 2015-01-06 | 2015-04-08 | 宁波江北华瑞电子有限公司 | General energy-saving LED (light-emitting diode) drive power supply device |
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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: 20130619 Termination date: 20150104 |
|
| EXPY | Termination of patent right or utility model |