CN202206602U - LED drive power supply - Google Patents
LED drive power supply Download PDFInfo
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- CN202206602U CN202206602U CN201120276236XU CN201120276236U CN202206602U CN 202206602 U CN202206602 U CN 202206602U CN 201120276236X U CN201120276236X U CN 201120276236XU CN 201120276236 U CN201120276236 U CN 201120276236U CN 202206602 U CN202206602 U CN 202206602U
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Abstract
The utility model provides an LED drive power supply, comprising a power supply input end, a rectification filtering unit, a voltage transformation unit, an output unit, a switch unit, a PFC control unit and a constant voltage constant current control unit, wherein the constant voltage constant current control unit comprises a constant voltage unit and a constant current unit, the constant voltage unit and the constant current unit respectively collect the signal of the output unit, generate a feedback signal and output the feedback signal to the PFC control unit, and the PFC control unit adjusts a control signal according to the feedback signal, and controls the periodic switching on and off of the switch unit to adjust the switching on and off period of the switch unit, thereby adjusting the output of the voltage transformation unit, realizing the accurate adjustment of the output, and increasing the power factor.
Description
Technical field
The utility model relates to the driving power field, relates in particular 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 begun to replace conventional light source at present and on various lightings, has widely applied.But; Because its driving power of LED self character decision can not adopt same power supply with ordinary incandescent lamp; Thereby LED is damaged in order to avoid voltage fluctuation causes electric current to increase; Thereby must design new power supply fully satisfying the LED required driving requirement of working, thus 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.Fig. 1 is existing LED driving power work principle figure.It at first carries out voltage transformation to the voltage of input input, 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.
Summary of the invention
The purpose of the utility model be to provide a kind of can be to the operating voltage of LED and the LED driving power that electric current is accurately adjusted and power factor is high.
The purpose of the utility model realizes through following technical scheme.
A kind of LED driving power comprises: a power input; One rectification filtering unit that links to each other with power input; One voltage transformation module that links to each other with rectification filtering unit; Output unit is changed and delivered to the voltage of said voltage transformation module after to rectifying and wave-filtering: the output unit that links to each other with voltage transformation module; The output of said output unit and load LED link to each other: the switch element that is connected with voltage transformation module, and said switch element is controlled the voltage transitions of said voltage transformation module according to its conducting and shutoff; The one PFC control unit that is connected with switch element, said PFC control unit produce a control signal and control said switch element periodically conducting and shutoff; Also comprise: one decides current control unit with output unit with the constant voltage that the PFC control unit is connected; Said constant voltage is decided current control unit and is comprised a constant voltage unit and a constant current unit, and said constant voltage unit and constant current unit are gathered the signal of output unit respectively and produced and feed back signal to the PFC control unit; Said PFC control unit is controlled said switch element periodically conducting and shutoff according to said feedback signal adjustment control signal, with the cycle of adjustment switch element conducting and shutoff, thus the output of adjustment voltage transformation module.
Preferably, said constant voltage unit comprises a voltage comparator and a voltage stabilizing portion as a reference source, and said voltage stabilizing portion is voltage-stabiliser tube or voltage stabilizing chip.
Preferably, said constant current unit comprises a current comparator, and the benchmark of said current comparator is taken from the voltage stabilizing portion of said constant voltage unit.
Preferably, said PFC control unit also links to each other with the output of rectification filtering unit, and it is gathered the signal of said rectification filtering unit output and adjusts control signal according to the signal that collects.
Preferably, said voltage transformation module is also supplied power to the PFC control unit through connecting a Voltage stabilizing module.
Preferably, said constant voltage is decided current control unit and is connected through optical coupler with the PFC control unit.
The utility model compared with prior art; The utility model LED driving power is decided current control unit and PFC control unit through switch element, voltage transformation module, constant voltage are set, and utilize constant voltage to decide voltage signal and current signal that constant voltage unit and constant current unit in the current control unit are gathered output unit respectively, and generation feeds back signal to the PFC control unit; Said PFC control unit is according to said feedback signal adjustment control signal; With adjustment switch element conducting and shutoff, thereby the output of adjustment voltage transformation module realizes the accurate adjustment to LED operating voltage and electric current; Make load LED work more stable, 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 the output of adjustment voltage transformation module is further accurately adjusted the LED operating current and is improved power factor.
Description of drawings
Fig. 1 is the fundamental diagram of prior art LED driving power.
Fig. 2 is the principle assumption diagram of the utility model LED driving power.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 2, the utility model LED driving power comprises that external power input, EMI filter unit, rectification filtering unit, voltage transformation module, output unit, switch element, constant voltage decide current control unit and PFC control unit.Wherein, The input of EMI filter unit links to each other with the external power input; Be mainly used in the noise that suppresses electric network noise and self produce, eliminate electrical network to the influence of LED driving power and LED driving power to the influence of electrical network, improve the antijamming capability of LED driving power and the reliability of system.The output of EMI filter unit links to each other with the input of rectification filtering unit, exports after converting direct current and filtering to behind the signal rectification that rectification filtering unit transmits the EMI filter unit.
Voltage transformation module links to each other with rectification filtering unit, switch element and output unit; It receives the signal of rectification filtering unit output; Under the control of switch element, carry out voltage transitions, and the voltage after will changing outputs to output unit, export LED to by output unit again and drive its work.Voltage transformation module also links to each other with the PFC control unit, for the PFC control unit provides working power.
Switch element links to each other with PFC control unit and voltage transformation module, and it receives control signal control and the periodically conducting and the shutoff of PFC control unit output, and thereby the voltage transitions of control voltage transformation module.Said switch element can be triode or FET.
Constant voltage is decided current control unit and is linked to each other with the PFC control unit with output unit, and it is gathered the voltage and current signal of output unit and produce one and feeds back signal to the PFC control unit, through the PFC control unit output is accurately adjusted.Said constant voltage is decided current control unit and is comprised a constant voltage unit and a constant current unit; Said constant voltage unit is gathered the voltage signal of output unit and is relatively produced a feedback signal in the back with a reference voltage, and said constant current unit is gathered the current signal of output unit and relatively produced a feedback signal in the back with a reference current.
The PFC control unit links to each other with the constant voltage constant current unit with switch element, and main control is used.The output of PFC control unit produces a control signal and controls said switch element periodically conducting and shutoff; And the feedback signal adjustment control signal that can decide current control unit according to constant voltage; With the cycle of adjustment switch element conducting and shutoff; Thereby the output of adjustment voltage transformation module realizes the accurate adjustment to the LED operating current.Owing to added constant voltage unit and constant current unit at output unit; Both can adjust also and can adjust the voltage of output to the electric current of output; Carry out feedback adjustment compared to simple employing constant current unit and have better adjustment effect, even under the situation that a certain parallel branch LED opens circuit, also can well realize accurate adjustment output.In order further to strengthen accurate control to the LED driving power; 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 the output of adjustment voltage transformation module reaches further accurately adjustment LED operating current and the purpose that improves power factor.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (6)
1. a LED driving power comprises: a power input; One rectification filtering unit that links to each other with power input; One voltage transformation module that links to each other with rectification filtering unit; One output unit that links to each other with voltage transformation module, the output of said output unit links to each other with load LED; One switch element that is connected with voltage transformation module; The one PFC control unit that is connected with switch element; It is characterized in that: also comprise: one decides current control unit with output unit with the constant voltage that the PFC control unit is connected, and said constant voltage is decided current control unit and comprised a constant voltage unit and a constant current unit.
2. LED driving power as claimed in claim 1 is characterized in that: said constant voltage unit comprises a voltage comparator and a voltage stabilizing portion as a reference source, and said voltage stabilizing portion is voltage-stabiliser tube or voltage stabilizing chip.
3. LED driving power as claimed in claim 2 is characterized in that: said constant current unit comprises a current comparator, and the benchmark of said current comparator is taken from the voltage stabilizing portion of said constant voltage unit.
4. LED driving power as claimed in claim 1 is characterized in that: said PFC control unit also links to each other with the output of rectification filtering unit, and it is gathered the signal of said rectification filtering unit output and adjusts control signal according to the signal that collects.
5. like the described LED driving power of claim l, it is characterized in that: said voltage transformation module is also supplied power to the PFC control unit through connecting a Voltage stabilizing module.
6. LED driving power as claimed in claim 1 is characterized in that: said constant voltage is decided current control unit and is connected through optical coupler with the PFC control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120276236XU CN202206602U (en) | 2011-08-01 | 2011-08-01 | LED drive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120276236XU CN202206602U (en) | 2011-08-01 | 2011-08-01 | LED drive power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202206602U true CN202206602U (en) | 2012-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120276236XU Expired - Fee Related CN202206602U (en) | 2011-08-01 | 2011-08-01 | LED drive power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202206602U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107682974A (en) * | 2017-11-09 | 2018-02-09 | 广西焕耘电子商务有限公司 | Light gradient control system |
| WO2019056320A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
-
2011
- 2011-08-01 CN CN201120276236XU patent/CN202206602U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019056320A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| US10819246B2 (en) | 2017-09-22 | 2020-10-27 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply circuit based on feedback signal, power supply device and control method |
| CN107682974A (en) * | 2017-11-09 | 2018-02-09 | 广西焕耘电子商务有限公司 | Light gradient control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20130801 |