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Single-stage ZVS PWM full-bridge converter

机译:单级ZVS PWM全桥转换器

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摘要

A new soft-switched ac-dc single-stage pulse width modulation (PWM) full-bridge converter is proposed. The converter operates with zero-voltage switching (ZVS), fixed switching frequency, and with a continuous input current that is sinusoidal and in phase with the input voltage. This is in contrast with other ac-dc single-stage PWM full-bridge converters that are either resonant converters operating with variable switching frequency control and high conduction losses, converters whose switches cannot operate with ZVS, or converters that cannot perform power factor correction (PFC) unless the input current is discontinuous. All converter switches operate with soft-switching due to a simple auxiliary circuit that is used for only a small fraction of the switching cycle. The operation of the converter is explained and analyzed, guidelines for the design of the converter are given, and its feasibility is shown with results obtained from an experimental prototype.
机译:提出了一种新型的软开关交流直流单级脉宽调制(PWM)全桥转换器。转换器以零电压开关(ZVS),固定开关频率以及正弦且与输入电压同相的连续输入电流工作。这与其他ac-dc单级PWM全桥转换器形成对比,后者是具有可变开关频率控制和高导通损耗的谐振转换器,其开关无法与ZVS一起运行的转换器,或者无法执行功率因数校正的转换器( PFC),除非输入电流不连续。由于简单的辅助电路仅在开关周期的一小部分中使用,因此所有转换器开关均采用软开关操作。解释和分析了转换器的操作,给出了转换器的设计指南,并通过实验原型获得的结果显示了其可行性。

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