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Controller, chip and method for eliminating current ripples of LED (Light-Emitting Diode) driving system

A technology of LED drive and system current, which is applied in the direction of electric light source, electrical components, circuit layout, etc., can solve the problems of eliminating ripple and cannot be realized, and achieve the effect of eliminating current ripple, improving work efficiency and increasing time constant

Active Publication Date: 2017-06-20
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 ripples of LED (Light-Emitting Diode) driving 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. Such as 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 th...

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 invention provides a controller, a chip and a method for eliminating current ripples of an LED (Light-Emitting Diode) driving system. The controller is electrically connected with an output end of an LED load and a first sampling resistor; the controller is configured to sample a voltage at an output end of the LED load and voltages at two ends of the first sampling resistor, and generate a first voltage signal according the voltage at the output end of the LED load and the voltages at the two ends of the first sampling resistors; the controller is used for generating a control signal according to the first voltage signal and voltages at the two ends of the first sampling resistor to control a conducting state of a power tube which is electrically connected with the LED load, so that the voltage magnitude of the first voltage signals is equal to that of a reference voltage, and the current ripples of the LED load are eliminated. Through adoption of the controller, the chip and the method, the LED current ripples are eliminated in a whole dimming process, and LED flickering caused by low-frequency jittering is avoided.

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
CPCF21V23/003H05B45/00
Inventor 杭中健朱伟巨
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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