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Analysis of a PWM-resonant converter

机译:PWM谐振转换器的分析

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摘要

When a parallel resonant tank is excited by a bipolar current pulse train a sinusoidal voltage develops across the tank whose amplitude depends on the duty cycle of the pulse train. An isolated secondary can be derived by applying the tank voltage to an isolation transformer whose magnetizing inductance acts as the resonant inductor of the tank circuit. A dc output voltage is obtained after rectification and filtering of the sinusoidal secondary voltage and regulation is achieved by controlling the duty cycle of the pulse train. The sinusoidal nature of the voltage across the isolation transformer alleviates some of the noise problem associated with parasitic capacitances of an isolation transformer when operated with square voltage waveform. In this work the dc and small-signal analysis of the converter is given and an equivalent small-signal circuit model is derived. Experimental results which confirm the validity of the model are presented.
机译:当并联谐振槽被双极性电流脉冲序列激励时,在槽两端会产生一个正弦电压,其振幅取决于脉冲序列的占空比。可以通过将储能电压施加到隔离变压器来获得隔离的次级,该隔离变压器的励磁电感充当储能电路的谐振电感器。在对正弦二次电压进行整流和滤波后,可获得直流输出电压,并通过控制脉冲序列的占空比实现调节。隔离变压器两端电压的正弦特性缓解了与隔离变压器的寄生电容相关的一些噪声问题,这些噪声问题是在以方形电压波形工作时。在这项工作中,给出了转换器的直流和小信号分析,并推导了等效的小信号电路模型。实验结果证实了该模型的有效性。

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