Drive circuit for high-power LED light source

A technology of LED light source and driving circuit, which is applied in the direction of light source, electric light source, electric lamp circuit layout, etc., can solve the problems of poor reliability, high cost, and large electromagnetic interference, and achieve the effect of cost reduction, high reliability, and good EMI performance

Inactive Publication Date: 2014-04-09
嘉兴市牛哈达教育科技有限公司
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  • Abstract
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Problems solved by technology

[0009] Aiming at the defects of high cost, poor reliability and high electromagnetic interference in the existing high-power LED light source, the ...

Method used

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  • Drive circuit for high-power LED light source
  • Drive circuit for high-power LED light source

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Embodiment Construction

[0025] Combine below figure 2 The present invention will be further described with specific embodiments.

[0026] A drive circuit for high-power LED light sources, as attached figure 2 As shown, it includes a PFC circuit, and also includes a multi-string transformer LLC conversion circuit, and the multi-string transformer LLC conversion circuit is connected with the PFC circuit for constant current driving of the LED array.

[0027] The multi-string transformer LLC conversion circuit includes an isolated half-bridge composed of a first switch tube S1, a second switch tube S2, a first capacitor C1, and a second capacitor C2, and two identical isolation transformers T1 and T2. The primary sides of the first transformer T1 and the second transformer T2 are connected in series and connected to both ends of the diagonal line of the isolated half-bridge. After the secondary side of the first transformer T1 is connected in series with the eighth capacitor Cs1, the two ends of the ...

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Abstract

The present invention relates to the technical field of the light source driving, and more particularly relates to and discloses a drive circuit for a high-power LED light source, including the PFC circuit, further comprising a multi-string conversion circuit LLC transformer, the transformer of multi-string conversion circuit PFC circuit LLC connection for the constant current driver for LED array. The multi-string conversion circuit includes an isolation transformer LLC half-bridge, a number of the same isolation transformers, isolation transformers more than the original series and connected with the side of the half-bridge, each isolation transformer secondary side connection and two anti-LED string. A high-power LED light source driving circuit through the use of multi-string transformer LLC control, constant current drive multiple LED strings, the output section no longer have many DC/DC converter, which greatly reduces the number of components, but can also reduce the size of the printed circuit board, with low cost, high efficiency, high reliability, good resistance to electromagnetic interference and so on.

Description

technical field [0001] The invention relates to the technical field of light source driving, in particular to a driving circuit for a high-power LED light source. Background technique [0002] Now, LED technology has been gradually promoted as a new technology to replace inefficient incandescent and fluorescent lamps. In general LED lighting applications, high-power LED lighting (>100W) shows great advantages in terms of energy saving and longevity compared with traditional lighting such as high-pressure sodium lamps and CFL energy-saving lamps. The market positioning of high-power professional LED lighting is mainly road lighting and other commercial lighting. [0003] For each LED lamp bead, if the same brightness is to be achieved, the applied driving current should be constant and not be affected by other factors of the driving system. Usually, for a power supply with a power specification greater than 65 watts, the LED array has several groups of LEDs connected ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 张福明
Owner 嘉兴市牛哈达教育科技有限公司
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