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Controller, chip and method of a dual-led drive system

An LED driver and controller technology, which is applied to light sources, electrical components, lighting devices, etc., can solve problems such as inability to ripple, and inability to achieve high-quality dimming of LEDs.

Active Publication Date: 2018-10-26
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 above-mentioned shortcomings of the prior art, the object of the present invention is to provide a controller, chip and method for a dual-LED drive system, which are used to solve the problem of the inability to eliminate the full-range fringe in the process of LED dimming in the prior art. The wave problem and the problem of not being able to achieve high-quality dimming of LEDs

Method used

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  • Controller, chip and method of a dual-led drive system
  • Controller, chip and method of a dual-led drive system
  • Controller, chip and method of a dual-led drive system

Examples

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Embodiment 1

[0051] This embodiment discloses a controller 200 for a dual-LED drive system. The following uses MOS tubes as an example to describe the first power tube and the second power tube. In other implementations, the first power tube and the second power tube The tube can also use a triode or other types of power tubes. Such as image 3 As shown, the controller 200 is electrically connected to the output terminal of the first LED load LEDs1, the first sampling resistor R0, the first power transistor M1, the output terminal of the second LED load LEDs2, the second power transistor M2 and the second sampling resistor R6. The controller 200 is used for sampling the voltage V of the output terminal of the first LED load LEDs1 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 first LED load LEDs1, that is, ...

Embodiment 2

[0087] This embodiment discloses a control method for a dual LED drive system, which uses the controller disclosed in Embodiment 1:

[0088] First, use the controller to adopt the voltage V of the output terminal of the first LED load LEDs1 DRAIN and the voltage V across the first sampling resistor R0 CS , and according to the voltage V at the output of the first LED load LEDs1 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 V across the first sampling resistor R0 CS generate the first control signal V GATE1 , so as to control the conduction state of the first power transistor M1 connected to the first LED load LEDs1, so that the first voltage signal V DV1 The magnitude of the voltage and the first reference voltage V REF1 are equal, the elimination of the current ripple of the LED load 200 is realized. And, the controller also acco...

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Abstract

The present invention provides a controller, chip and method for a dual LED drive system. The controller is electrically connected to the output terminal of the first LED load, the first sampling resistor, the second sampling resistor and the output terminal of the second LED load. The controller is controlled by It is configured to sample the voltage at the output end of the first LED load and the voltage at both ends of the first sampling resistor, and generate a first voltage signal accordingly; generate a first control signal according to the first voltage signal and the voltage at both ends of the first sampling resistor for controlling The conduction state of the first power tube makes the voltage of the first voltage signal equal to the first reference voltage, eliminating the current ripple of the LED load; and, the controller also generates and controls the second power according to the driving current and the second reference voltage The second control signal of the conduction state of the tube, and then adjust the current flowing through the second LED load, so as to realize the precise and smooth switching of the current between the dual LED loads, and the soft adjustment of the light brightness of the dual LED loads.

Description

technical field [0001] The invention relates to the field of constant current drive control, in particular to a controller, chip and method for a dual LED drive system for eliminating current ripple in an LED drive system and smooth switching of current between dual LED loads. 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 ji...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/40H05B45/10
Inventor 杭中健朱伟巨
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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