Research on a three-level PFC circuit with low voltage stress
Three-level and multilevel circuits have the advantages of smaller DC voltage pulsation and reduced circuit loss,and can make DC current waveform closer to sinusoidal,so a four-switch three-level PFC circuit is proposed in this paper.In this pa-per,four switching tubes are combined to make it have multidirectional switching function,which can not only raise the output voltage to three levels,reduce the voltage stress of switching tubes,but also provide a circuit for inductive charging.At the same time,the circuit can open up to two switches in each mode and share a pulse signal,which simplifies the control complexity in a certain sense.Finally,an experimental platform with rated power of 800 W is built to verify the correctness of the theoretical analysis.
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