提出并实现了一种推挽式PWM电压型逆变器用无源吸收电路；设有独立的放电回路让缓冲电容器上的能量部分地回馈到直流电源中，高频放电能量不会叠加在输出电压上；缓冲电容器的电压被钳位，使得推挽电路特有的倍压不会在吸收电路上造成额外的损耗。给出吸收电路参数的设计准则和计算实例，在200VDC 和30kW 级的中压中功率逆变装置中发挥了推挽拓扑的优点。理论分析和实验验证了所提方法的有效性。 ABSTRACT: A low loss passive snubber is developed for the PWM push-pull Voltage Source Inverter (VSI). In order to avoid the superposition of the high frequency discharge energy on the output voltage, an independent discharge circuit is introduced to feed back part of the energy in the capacitor to DC source. Due to the voltage clamp on the capacitor, there is,for the doubled voltage of the push-pull circuit, no additional loss in the snubber. Details of design and a 200V DC input,30kW VSI application example are also presented.Experimental results show that the circuit topology is a good choice in low loss snubber design. KEY WORDS: electric power engineering; push-pull voltage source inverter; surge voltage; switching loss; snubber circuit
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