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Controller, chip and method for eliminating current ripple of LED driving system

A technology of LED drive and system current, applied in the direction of electric light source, electrical components, circuit layout, etc., can solve the problems of eliminating ripple and inability to achieve, and achieve the effect of eliminating current ripple

Active Publication Date: 2017-05-10
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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. It is impossible to eliminate the ripple in the whole process, and the problem of overvoltage protection of the drain of the MOS tube

Method used

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  • Controller, chip and method for eliminating current ripple of LED driving system
  • Controller, chip and method for eliminating current ripple of LED driving system
  • Controller, chip and method for eliminating current ripple of LED driving system

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Embodiment 1

[0048] This embodiment discloses a controller 100 for eliminating the current ripple of the LED driving system. The following uses a MOS transistor as the first power transistor for illustration. In other implementations, the first power transistor can also be a triode or Other types of power tubes. Such as image 3 As shown, the controller 100 is electrically connected to the output terminal of the LED load 200, the first sampling resistor R0 and the first power transistor M1. The controller 100 is used to sample the voltage V at the output terminal of the LED load 200 DRAIN , the voltage V across the first sampling resistor R0 CS and the drain voltage of the first power transistor M1, and the drain voltage of the first power transistor M1 is the same as the voltage at the output terminal of the LED load 200, that is, the drain voltage of the first power transistor M1 is V DRAIN . Further, the controller 100 according to the voltage V of the output terminal of the LED loa...

Embodiment 2

[0077] This embodiment discloses a method for eliminating current ripple in an LED drive system, which uses the controller disclosed in Embodiment 1:

[0078] First, use the controller to sample the voltage V at the output terminal of the LED load 200 DRAIN , the voltage V across the first sampling resistor R0 CS and the drain voltage V of the first power transistor M1 DRAIN , 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 ; According to the drain voltage V of the first power transistor M1 DRAIN generate the second voltage signal V DV2 ; Then, the controller again 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...

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Abstract

The invention provides a controller, chip and method for eliminating current ripple of an LED driving system. The controller is electrically connected with a negative electrode of an LED load, a first sampling resistor and a first power tube and is configured to sample a voltage of the negative electrode of the LED load, voltages of two ends of the first sampling resistor and a drain voltage of the first power tube and generate a first voltage signal and a second signal, the controller is used for generating a control signal to control a switch-on state of the first power tube according to the first voltage signal and the voltages of the two ends of the first sampling resistor so that the voltage size of the first voltage signal is equal to a reference voltage and the current ripple of the LED load is eliminated, and the controller is used for adjusting the control signal so that the drain voltage is maintained stable according to the second voltage signal when the drain voltage exceeds a voltage threshold value. By the controller, the LED current ripple is eliminated during the full process of dimming, LED flicker caused by low-frequency shaking is prevented, and overvoltage protection of the first power tube is achieved.

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 Applications(China)
IPC IPC(8): H05B33/08F21V23/00H05B44/00
CPCF21V23/003H05B45/00Y02B20/30
Inventor 朱伟巨杭中健
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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