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三相电压型ZCTPWM变换器的效率分析与实验研究

DOI: 10.13334/j.0258-8013.pcsee.2014.18.001, PP. 2863-2872

Keywords: 零电流开关,软开关,二极管反向恢复,结电容,开关损耗,功率器件

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Abstract:

对一种应用于三相电压型脉宽调制(pulsewidthmodulation,PWM)变流器的零电流开关(zerocurrenttransition,ZCT)软开关技术进行深入理论分析,通过数学推导和实验验证指出,由于功率器件二极管反向恢复和结电容的影响,理想的软开关过程很难实现,特别是在大功率应用场合。研究表明,虽然采用此ZCT软开关技术可减小主开关管的部分开关损耗,但却引入了多个二极管的反向恢复,总体效率能否提高与功率器件二极管反向恢复电荷和结电容大小有关。

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