LED current sharing circuit

A technology of LED drive and circuit, applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problems of reducing the life and reliability of LED lamps, LED light decay, aging acceleration, etc., to improve the reliability of LED lighting, improve Effect of output light quality and cost reduction

Inactive Publication Date: 2016-05-25
WUHU RUIXIN ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an LED current sharing circuit, which solves the problem that when multiple LED branches are connected in parallel to the same voltage source, the current in each LED branch is not completely equal due to the difference in the conduction voltage. , LED lamps with large current branches are prone to light decay, accelerated aging or even extinguished, which reduces the life and reliability of LED lamps

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  • LED current sharing circuit

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specific Embodiment approach

[0017] A specific embodiment of the present invention: an LED current sharing circuit, wherein the current sharing circuit includes a plurality of LED branches, an LED driving circuit, an input port connected to the LED driving circuit, and an output port connected to the LED driving circuit Port and controller, controller and current equalizing switch Q, the plurality of LED branches are connected in parallel to the output port, so that the voltage U on the LED branch 0 The voltage is the same as that of the LED drive circuit, each LED branch is provided with a current equalizing switch Q, and the output end is also connected with a controller.

[0018] Wherein, the capacitive impedance of each LED branch is greater than the sum of the equivalent internal resistances of all LEDs in the branch, and the capacitive impedance of each LED branch is the sum of the equivalent internal resistances of all LEDs in the branch. 3 times, the current sharing duty cycle of the at least one ...

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Abstract

The invention discloses an LED current sharing circuit. The LED current sharing circuit is characterized by comprising multiple LED branches, an LED driving circuit, an input port, an output port, a controller and current sharing switches Q, wherein the input port is connected with the LED driving circuit, the output port and the controller are connected with the LED driving circuit, the LED branches are connected in parallel to the output port, the voltage U0 of the LED branches is the same with that of the LED driving circuit, each LED branch is provided with the corresponding current sharing switches Q, and the output end of each LED branch is connected with the controller. The LED current sharing circuit of the invention can be used to solve the problem that the service life and reliability of LED lamps are reduced due to the fact that the LED lamps in the heavy-current branches tend to light decay, accelerated aging and even quenching when the LED branches are connected in parallel to the same voltage source and the currents in the LED branches are unequal due to the difference of conduction voltage.

Description

technical field [0001] The invention relates to an LED circuit, in particular to an LED current equalizing circuit. Background technique [0002] LED light sources have the characteristics of high luminous efficiency and long life, so they are widely used in household, commercial and industrial fields. At present, most LED light sources on the market have a single-chip package power of 1-3W, which is because it is difficult to solve the heat dissipation problem of high-power single-chip package. Therefore, in most lighting occasions, such as LCD backlight, street lamps and general lighting, etc., it is necessary to use multiple LED light sources at the same time to meet the lighting intensity requirements, and when multiple LED light sources work at the same time, the brightness must be uniform. The output light spectrum and luminous efficiency of the LED are directly related to the driving current of the LED. In order to meet the requirement of uniform brightness, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 朱成华崔俊国
Owner WUHU RUIXIN ELECTRONICS TECH CO LTD
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