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LED driver dimming feedback control circuit

A technology of LED drive and feedback control, applied in the field of LED, can solve the problems of audio noise dimming depth, flicker, unable to meet the dimming depth requirements, etc., and achieve the effect of improving output current and high efficiency

Active Publication Date: 2018-12-14
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a feedback control circuit for LED driver dimming, which is used to solve the problem in the prior art that the output current has the power frequency ripple of the AC mains, which is easy to cause The problem of flickering occurs, and the PWM control is demanding, and the audio noise is prone to occur during PWM dimming, or the dimming depth cannot meet the dimming depth requirement of 1%.

Method used

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  • LED driver dimming feedback control circuit

Examples

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Embodiment 1

[0071] see Figure 4 , this embodiment provides an LED driver dimming feedback control circuit, the LED driver dimming feedback control circuit includes: a voltage input module (not shown), at least one control chip 21, a first resistor R1, a second resistor R2 , a third resistor R3, a sampling resistor Rcs, a first capacitor C1, a second capacitor C2, a first load LED1 and an optocoupler module 23; the control chip 21 includes an internal voltage module 211, a constant current control module 212, and a voltage control module 213 and a dimming module 214; one end of the internal voltage module 211 is electrically connected to the voltage input module, and the other end is grounded through the first capacitor C1, which is suitable for generating the internal voltage of the chip and filtered by the first capacitor C1 Then output power supply to the outside; one end of the constant current control module 212 is electrically connected to the first load LED1 through the first load ...

Embodiment 2

[0088] see Figure 6 The present invention also provides an LED driver dimming feedback control circuit, said LED driver dimming feedback control circuit comprising: a voltage input module 22, at least one control chip 21, a main circuit 24, a first capacitor C1, and a second capacitor C2 and sampling resistor Rcs; the control chip 21 includes an internal voltage module 211, a constant current control module 212, a voltage control module 213, a main control module 215 and a dimming module 214; one end of the internal voltage module 211 is connected to the voltage input module 22, and the other end is grounded through the first capacitor C1, which is suitable for generating the internal voltage of the chip and outputting power supply after being filtered by the first capacitor C1; one end of the constant current control module 212 is connected to the The main circuit 24 is electrically connected, and the other end is grounded through the sampling resistor Rcs, which is suitable...

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Abstract

The present invention provides an LED drive dimming feedback control circuit, comprising: a voltage input module, at least one control chip, a first resistor, a second resistor, a third resistor, a sampling resistor, a first capacitor, a second capacitor, and a first load and optocoupler modules. The present invention provides the feedback control function of dimming by adding a control chip, which has the following beneficial effects: the output current has no power frequency ripple, and there will be no flickering of power frequency ripple; the dimming does not require a DC_DC module, and PWM dimming does not There is audio noise; the dimming depth can reach 1%; the efficiency of the entire control circuit is high; multiple control chips are connected in parallel to increase the output current, which is suitable for high output current applications.

Description

technical field [0001] The invention belongs to the technical field of LEDs, in particular to an LED driving dimming feedback control circuit. Background technique [0002] In the current dimming application of LED lighting, the usual LED dimming control circuit such as figure 1 As shown, it includes an AC power supply AC, a first-stage AC (alternating current)-DC (direct current) constant voltage output module 11 , a second-stage dimmable DC (direct current)-DC (direct current) module 12 and a load 13 connected in sequence. Both the first-stage AC-DC output constant voltage module 11 and the second-stage dimmable DC-DC module 12 have mature applications, but the cost is relatively high, and the second-stage dimmable DC-DC The module 12 will bring additional EMC (Electro magnetic compatibility, electromagnetic compatibility) and interference problems. [0003] Another LED dimming control circuit such as figure 2 shown, compared to figure 1 In the LED dimming control cir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10
Inventor 刘军吴泉清李建民盛欢
Owner CRM ICBG (WUXI) CO LTD
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