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Controller, chip and method for eliminating current ripple in LED drive system

A technology of LED driving and system current, applied in the direction of electric light source, electrical components, circuit layout, etc., can solve problems such as inability to realize and eliminate ripple, and achieve the effect of improving work efficiency, eliminating current ripple, and eliminating low-frequency jitter.

Active Publication Date: 2018-11-09
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a controller, chip and method for eliminating current ripple in the LED drive system, which are used to solve the problem of LED dimming in the prior art. Unable to eliminate the problem of ripple in the whole process

Method used

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  • Controller, chip and method for eliminating current ripple in LED drive system
  • Controller, chip and method for eliminating current ripple in LED drive system
  • Controller, chip and method for eliminating current ripple in LED drive system

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Embodiment 1

[0045] This embodiment discloses a controller for eliminating current ripple in an LED driving system. The following uses a MOS tube as an example for illustration. In other implementations, the power tube may also be a triode or other types of power tubes. like image 3 As shown, the controller 100 is electrically connected to the output terminal of the LED load 200 and the first sampling resistor R0. The controller 100 is used to sample the voltage V at the output terminal of the LED load 200 DRAIN and the voltage V across the first sampling resistor R0 CS , and, according to the voltage V at the output terminal of the LED load 200 DRAIN and the voltage V across the first sampling resistor R0 CS generate the first voltage signal V DV1 ; Further, the controller 100 also according to the first voltage signal V DV1 and the first voltage signal V DV1 generate the corresponding control signal V GATE , through the control signal V GATE Control the conduction state of the p...

Embodiment 2

[0062] This embodiment discloses a method for eliminating current ripple in an LED drive system, which uses the controller disclosed in Embodiment 1:

[0063] First, the controller adopts the voltage V of the output terminal of the LED load 200 DRAIN and the voltage V across the first sampling resistor R0 CS , and according to the voltage V at the output of the LED load 200 DRAIN and the voltage V across the first sampling resistor R0 CS generate the first voltage signal V DV1 ; The controller then according to the first voltage signal V DV1 and the voltage across the first sampling resistor V CS Generate control signal V GATE , so as to control the conduction state of the power transistor M0 connected to the LED load 200, so that the first voltage signal V DV1 The magnitude of the voltage and the reference voltage V REF are equal, the elimination of the current ripple of the LED load 200 is realized.

[0064] Specifically, the sampling module 110 samples the output te...

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Abstract

The present invention provides a controller, chip and method for eliminating current ripple in an LED drive system. The controller is electrically connected to the output terminal of the LED load and the first sampling resistor, and the controller is configured to sample the output terminal of the LED load. voltage and the voltage at both ends of the first sampling resistor, and generate a first voltage signal according to the voltage at the output terminal of the LED load and the voltage at both ends of the first sampling resistor; the controller generates a first voltage signal according to the first voltage signal and the The voltage generation control signal at both ends of the first sampling resistor is used to control the conduction state of the power tube electrically connected to the LED load, so that the voltage of the first voltage signal is equal to the reference voltage, and the current of the LED load is eliminated. ripple. The present invention eliminates LED current ripple in the whole process of dimming, and avoids LED flicker caused by low-frequency jitter.

Description

technical field [0001] The invention relates to the field of constant current drive control, in particular to a controller, chip and method for eliminating current ripple in an LED drive system. Background technique [0002] With the full application of LEDs in the field of lighting, high-efficiency APFC (Active Power Factor Correction, active power factor correction) drivers, thyristor dimming or high PF (Power Factor, power factor) linear drivers have been widely used . The front stage uses APFC driver, thyristor dimming or high PF linear driver, and its output current will contain 100hz / 120hz power frequency ripple components. Due to the existence of these ripple components, the brightness of the LED light source also fluctuates accordingly. With the development of the lighting industry, people have put forward higher requirements for the quality of LED light sources. No flicker and no jitter have become new requirements for high-performance LED lighting drivers. Theref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08F21V23/00H05B44/00
CPCF21V23/003H05B45/00
Inventor 杭中健朱伟巨
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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