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Isolated high-power factor flyback type primary-side constant-current control device of LED driver

A technology of LED driver and high power factor, which is applied in the direction of lighting device, lamp circuit layout, light source, etc., can solve the problems of optocoupler aging, large number of circuit components, etc., and achieve circuit reliability, reduce electromagnetic interference, and reduce the number of components Effect

Inactive Publication Date: 2010-12-22
ZHUHAI HUASAI ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This solution also has the problem of optocoupler aging. In addition, the sampling control circuit on the secondary side makes the number of circuit components more

Method used

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  • Isolated high-power factor flyback type primary-side constant-current control device of LED driver
  • Isolated high-power factor flyback type primary-side constant-current control device of LED driver
  • Isolated high-power factor flyback type primary-side constant-current control device of LED driver

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Embodiment Construction

[0040] The content of the present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0041] refer to Figure 4 The primary side constant current control device of the isolated high power factor flyback LED driver includes a peak sampling and holding module 21, a secondary side current simulation module 22, a half sine wave reference module 23, an average current loop 24, and a half sine wave generation module 25, A multiplication module 26 , a comparison module 27 , an inductor current zero-crossing detection module 28 , a driving pulse generation module 29 and a driving module 30 .

[0042] The application object of the present invention is the main circuit of the flyback LED driver, including the input rectifier bridge B 1 , input capacitance C in , transformer T, absorption network, primary side switch tube Q 1 , primary current sampling network, output rectifier (choose diode D 1 ) and the output capacitor ...

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Abstract

The invention discloses an isolated high-power factor flyback type primary-side constant-current control device of an LED driver. The output end of a peak value sampling and keeping module in the primary-side constant-current control device is connected with the input end of an auxiliary-side current simulating module, the output end of the auxiliary-side current simulating module is connected with one input end of an average current ring, the other input end of the average current ring is connected with a half-sinusoid reference module, the output end of the average current ring is connectedwith one input end of a multiplication module, the other input end of the multiplication module is connected with a half-sinusoid generating module, the output end of the multiplication module is connected with one input end of a comparison module, the output end of the comparison module is connected with one input end of a driving pulse generating module, an inductive current zero-passage detecting module is connected with the other input end of the driving pulse generating module, and the output end of the driving pulse generating module is connected with a driving module. The primary-side constant-current control device can realize high-power factor control and output constant-current control without an optical coupling circuit and an auxiliary-side feedback circuit.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to an isolated high power factor flyback LED driver primary side constant current control device. Background technique [0002] The light characteristics of LEDs are usually described as a function of current rather than voltage. A small change in the forward voltage drop of an LED will cause a large change in the LED current, thereby causing a large change in brightness. Therefore, using a constant voltage source to drive cannot guarantee the consistency of the LED brightness, and affects the reliability, life and light decay of the LED. Therefore, LEDs are usually driven by a constant current source. [0003] For the sake of safety, many LED lamps require the LED driver to have an isolation function, that is, to realize electrical isolation between the output and the grid input. Therefore, the current LED drive power mostly uses optocouplers to perform feedback co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 谢小高
Owner ZHUHAI HUASAI ELECTRONICS TECH CO LTD
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