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LED power driving circuit

A technology of LED power supply and drive circuit, applied in the field of LED lighting, can solve the problems of high cost, complex circuit, large power consumption, etc., and achieve the effect of low cost, simple circuit and few components

Inactive Publication Date: 2011-05-11
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a relatively simple circuit, low cost Lower, less power consumption to achieve high power factor LED power drive circuit in low power circuits

Method used

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Embodiment Construction

[0042] Such as figure 1 As shown, the LED power drive circuit of the present invention includes a power supply unit 10 , a conversion unit 20 and a rectification and filtering unit 30 connected in sequence, and a control unit 40 connected to the conversion unit 20 and the rectification and filtering unit 30 .

[0043] The power supply unit 10 includes a protective circuit 11, a first rectifier circuit 12 and a first filter circuit 13 which are sequentially connected, wherein the protective circuit 11 is connected to the input terminal of the power supply to protect the LED power drive circuit from surge current and high voltage of the power grid. And / or the impact of high current, and suppress harmonics and noise, improve EMC effect, filter common mode interference and differential mode interference; rectification circuit 12 is used to convert the low frequency alternating current provided by the power supply network into direct current and load it on the conversion unit 20 Ab...

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Abstract

The invention relates to a light-emitting diode (LED) power driving circuit, which comprises a power supply unit, a converting unit, a rectifying and filtering unit and a control unit. The power supply unit converts low-frequency alternating current provided by a power supply network into direct current; the converting unit converts the direct current into high-frequency output pulse; the rectifying and filtering unit filters and rectifies the high-frequency output pulse to obtain stable direct current output needed by an LED lamp; and the control unit samples the direct current output to obtain a voltage sampling signal, and generates a control signal according to an error between the voltage sampling signal and reference voltage through a pulse frequency regulator with a multiplier, wherein the control signal is used for controlling the converting unit to regulate the high-frequency output pulse. Due to the adoption of the pulse frequency regulator with the multiplier, the LED power driving circuit makes an LED driver simple in circuit structure and low in cost; besides, high-power factor output is realized, and the circuit contributes to saving electric energy. Moreover, due to simple circuit and a few devices, the circuit contributes to improving the production efficiency and circuit reliability.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to a low-power output LED power drive circuit with high power factor. Background technique [0002] LED light sources are widely used in various fields such as urban greening lighting, indoor and outdoor lighting, etc. due to their high luminous efficiency, high efficiency and energy saving, long life, and low-voltage controllable characteristics. For the sake of safety, LED electronic drivers usually use isolation. According to the traditional circuit design, in order to obtain a higher power factor, for circuits above 25W, it can be realized by adding an active power factor correction circuit in the electronic driver; Power circuits, the above-mentioned method of using active power factor correction circuits in electronic drivers will make the circuits very complicated, the cost will increase, and the energy consumed by power devices will increase instead, which is not conducive to th...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M7/08H02M1/14
CPCH05B45/335H05B45/382
Inventor 周明杰陈清桥
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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