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Single-switch multi-output converters as second stage of LED driver

机译:单开关多输出转换器作为LED驱动器的第二阶段

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摘要

Single-switch multi-output light emitting diode (LED) drivers derived from Cuk, Sepic and Zeta converter are proposed and analysed. The proposed multi-output LED drivers can achieve balanced output current of each LED string by charge balance of storage capacitor without auxiliary current balancing circuit. Therefore, if only the output current of one LED string is controlled to the required level, the output currents of other LED strings will be regulated to the same level naturally, which will greatly simplify the control loop, especially when the number of LED string is numerous. The proposed LED drivers use only one active switch, which decreases the volume of circuit and simplifies the control loop. Finally, a 76W prototype is built to verify the studied results.
机译:提出并分析了从CUK,SEPIC和Zeta转换器衍生的单开关多输出发光二极管(LED)驱动器。所提出的多输出LED驱动器可以通过在没有辅助电流平衡电路的情况下通过电荷平衡实现每个LED串的平衡输出电流。因此,如果仅将一个LED串的输出电流控制到所需的电平,则其他LED字符串的输出电流将自然地调节到相同的电平,这将大大简化控制回路,尤其是当LED串的数量是时很多的。所提出的LED驱动器仅使用一个有源开关,这会降低电路的体积并简化控制回路。最后,建立了76W原型以验证研究结果。

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