Non-strobe isolated LED constant-current driving circuit

A constant current drive, isolated technology, applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problems of endangering human health, visual nerve fatigue, shortening the service life of LED, etc.

Inactive Publication Date: 2014-10-08
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the instantaneous input power P in is the pulsating power in the form of sine square, and the output power P o Is the flat power, the voltage across the LED load can be regarded as a flat voltage, then the current I flowing through the LED load LED There is an AC component of 100Hz in

Method used

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  • Non-strobe isolated LED constant-current driving circuit
  • Non-strobe isolated LED constant-current driving circuit
  • Non-strobe isolated LED constant-current driving circuit

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Embodiment Construction

[0025] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] A flicker-free isolated lighting LED constant current drive circuit such as image 3 As shown, it includes: an AC input source, a rectifier bridge DB, a constant current drive module 1 , a filter capacitor C1 , an LED load and an LED stroboscopic elimination module 2 . Among them: both ends of the AC input source are connected to the AC side of the rectifier bridge DB, the positive pole of the DC side of the rectifier bridge DB is connected to the a terminal of the constant current drive module 1, and the negative pole of the DC side of the rectifier bridge DB is connected to the ground of the primary side; the constant current drive module The b terminal of 1 is connected to the positive terminal of the filter capacitor C1, the positive terminal o...

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Abstract

The invention discloses a non-strobe isolated LED constant-current driving circuit which comprises an alternating-current source, a rectifier bridge, a filtering capacitor, a constant-current driving unit and a strobe eliminating unit. The strobe eliminating unit comprises a reference voltage generation module, a voltage compensation module, a voltage clamping module, a sampling resistor, a switching tube, a sampling capacitor, an operational amplifier and a starting module. According to the LED constant-current driving circuit, currents of the LED driving circuit are controlled, the current of an LED load is made to be equal to a mean value of output currents of the constant-current driving unit, voltage of the switching tube is made to follow a voltage ripple component on the filtering capacitor, thus voltage on the LED load is direct voltage which almost has no ripple, the current on the LED load is a direct current which almost has no ripple, and therefore the purpose that an LED has no strobe is achieved.

Description

technical field [0001] The invention belongs to the technical field of LED constant current drive, and in particular relates to a flicker-free isolated LED constant current drive circuit. Background technique [0002] LED (Light Emitting Diode, Light Emitting Diode) is a typical current-mode device, and its ideal power supply mode is constant current power supply, which requires high stability of working current. The simple schematic diagram of the traditional strobe LED constant current drive circuit is as follows: figure 1 As shown, it includes an AC input source, a rectifier bridge, a constant current drive module 1, a filter capacitor C1 and an LED load, and the LED load and the filter capacitor C1 are directly connected in parallel. The constant current drive module 1 includes: a transformer, a control module 11 , a power tube M, and a resistor R. In order to meet the requirement of high power factor, the current output by the constant current drive module 1 contains ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 何乐年奚剑雄吴旭烽冷亚辉朱勤为黄飞明
Owner ZHEJIANG UNIV
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