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A led drive circuit with constant current and current sharing characteristics

A technology of LED driving and LED string, applied in the direction of electric light source, electrical components, electroluminescent light source, etc., can solve the problems of high driving voltage, heavy load branch damage, difference of LED string current, etc., and achieve a simple topology structure. Effect

Inactive Publication Date: 2020-04-10
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the differences in the characteristic parameters of LED lamps, the requirements of LED driving voltage on safety regulations, and the reliability of work, although the series connection of individual LEDs can ensure that their forward currents are equal, but too many LEDs in series will reduce the driving voltage. Too high, lower reliability
At present, in high-power applications, LED strings and parallel-connected structures are often used. Since each LED lamp has a different characteristic curve, even if the voltage applied to the LED strings is the same, the current in each LED string will has a difference
This will make each LED string in different working conditions, which will reduce the life of the heavy-duty branch at least, and cause damage to the heavy-duty branch

Method used

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  • A led drive circuit with constant current and current sharing characteristics
  • A led drive circuit with constant current and current sharing characteristics
  • A led drive circuit with constant current and current sharing characteristics

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 As shown, an LED drive circuit with constant current and current sharing characteristics is composed of a DC power supply, a constant current network, a current sharing network and an LED load, specifically including a first switch tube Q1, a second switch tube Q2, and a third switch tube. Tube Q3, fourth switching tube Q4, first resonant inductor L1, second resonant inductor L2, first capacitor C1, second capacitor C2, third capacitor C3, fourth capacitor C4 and LED lamp load circuit. DC power supply, generally the output voltage of the previous stage PFC circuit.

[0017] The LED lamp load circuit includes a first LED lamp string LED11, ... LED1n, a second LED lamp string LED21, ... LED2n, a third LED lamp string LED31, ... LED3n, a fourth LED lamp string LED41, ... LED4n, a first rectifier Diode D1, second rectifier diode D2...

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Abstract

The invention discloses an LED drive circuit with constant current and current equalization characteristics, comprising a constant current network, a current equalization network and an LED lamp load circuit, the constant current network is composed of a full-bridge resonant network with constant current characteristics, and the current equalization network Realize the current sharing work of four LED lamps through capacitive current sharing. The LED drive circuit proposed by the present invention can provide constant current and current sharing output for four LED lamp loads with the same or different numbers. The circuit not only has inherent automatic Constant current and current sharing characteristics, also has the characteristics of simple topology, small number of components and easy implementation.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to an LED driving circuit with constant current and current sharing characteristics. Background technique [0002] As a lighting source, LED has the characteristics of high luminous efficiency, long life, fast response and good environmental protection, and has begun to replace traditional light sources in many lighting fields. Due to the low power and low brightness of a single LED lamp bead, the lighting scheme using a single LED as a lighting source cannot meet the requirements in lighting occasions that require large areas and high illuminance. In order to solve this problem, LEDs are often connected in parallel, series and hybrid. Considering the differences in the characteristic parameters of LED lamps, the requirements of LED driving voltage on safety regulations, and the reliability of work, although the series connection of individual LEDs can ensure that their forward...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/345H05B44/00
CPCH05B45/00
Inventor 林国庆陈山秦林梅珍
Owner FUZHOU UNIV