Soft switched capacitively coupled DC-AC converter for high power

Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting Pub Date : 1993-10-02 DOI:10.1109/IAS.1993.298990

M. Ehsani, T.S. Wu

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引用次数: 6

Abstract

A capacitively coupled DC-AC power converter which is capable of zero current soft switching is presented. A form of amplitude modulation is introduced to provide a sinusoidal output waveform. Due to its favorable current stresses on the switches, this converter is suitable for high current high power inductive load applications. With this technique, switching losses can be reduced. The soft switching method is accomplished by the alternating voltage of the capacitor. The series inductive snubbers assure the zero current turn-on of the switches. Reduction of the switching losses implies that the switching frequency and the overall system efficiency can be increased for high-power gate-turn-off devices. Since this converter can operate at higher switching frequencies, the reactive component sizes can be decreased and the power density can be raised in high-power applications. The zero current soft switching method makes the capacitively coupled converter suitable for high-current, high-power inductive load applications, such as motor drives, without significantly increasing the conduction losses.<>

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高功率软开关电容耦合DC-AC变换器

提出了一种能够实现零电流软开关的电容耦合直流-交流功率变换器。一种形式的调幅被引入，以提供一个正弦输出波形。由于该变换器对开关具有良好的电流应力，因此适用于大电流、高功率的感性负载应用。使用这种技术，可以减少开关损耗。软开关方法是通过电容器的交变电压来实现的。系列电感缓冲器确保开关的零电流导通。降低开关损耗意味着可以提高大功率栅极关断器件的开关频率和整体系统效率。由于该变换器可以在更高的开关频率下工作，因此在大功率应用中可以减小无功元件的尺寸并提高功率密度。零电流软开关方法使电容耦合变换器适用于大电流、高功率电感负载应用，如电机驱动，而不会显著增加传导损耗。

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Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting

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