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Current ripple elimination control circuit

A technology for controlling circuit and current ripple, applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve problems such as injury and health damage, achieve the effects of reducing power consumption, avoiding flicker, and reducing output current ripple

Active Publication Date: 2015-07-01
乐雷光电(中国)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid the flickering (stroboscopic) of lighting light from causing damage and harm to people's health, it is a technical problem to be solved to design an LED drive circuit with lower output ripple.

Method used

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Examples

Experimental program
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Embodiment Construction

[0017] figure 1 It shows the control circuit for eliminating current ripple in the LED constant current driver of the present invention. The positive output terminal of the LED is +Vout, +Vout is connected to the positive input terminal of LED1, and the other end of LED1 is connected to the drain of the field effect transistor Q1; +Vout-resistor RTN is the negative output terminal after being rectified by the rectifier bridge; +Vout-Resistor RTN is connected to one end of the resistor Rs, the other end of the resistor Rs is connected to the source of the field effect transistor Q1, one end of the resistor R1, and the negative input end of the amplifier OP1, and the other end of the resistor R1 is connected to C1, The other end of C1 is connected to the output end of the amplifier OP1 and the gate of the field effect transistor Q1; the positive input end of the amplifier OP1 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to SGND;...

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Abstract

The invention discloses a monopole PFC (power factor correction) flyback supply current ripple elimination control circuit and belongs to the technical field of constant current drive. The current ripple elimination control circuit mainly comprises a constant current source circuit, an automatic adjustment feedback circuit, a Darlington circuit and an LED light emitting diode. The current ripple elimination control circuit is used for eliminating power frequency current ripples in an LED drive, so that flicker is eliminated.

Description

technical field [0001] The invention relates to the technical field of constant current driving, in particular to a control circuit for eliminating current ripple in a constant current driver of a light emitting diode. Background technique [0002] When designing a constant current driver for a light-emitting diode (LED) load, a single-stage PFC (Power Factor Correction) circuit is usually used. Drive the LEDs. [0003] At present, single-stage PFC flyback LED drive power has been widely used in LED drivers. However, since the single-stage PFC output low-frequency ripple cannot be reduced, it has become a fatal flaw of the single-stage PFC. Since this topology uses PFM (frequency modulation) mode to adjust feedback and has a high power factor, there is no large electrolytic capacitor behind the rectifier bridge, so the low-frequency ripple noise caused by the sine wave of the AC power grid is transmitted to the output terminal, causing the LED light to flicker (strobe) qu...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 陈显林彭解红
Owner 乐雷光电(中国)有限公司