Analysis of the Body Diode Reverse Recovery of MOSFETs in ZVS PWM Combined Three-level Converter

Zero-voltage-switching (ZVS) PWM combined three-level (TL) converter is suitable for high input voltage with wide range applications because the switches sustain only half of the input voltage and the output Alter inductance can be reduced significantly. However, the MOSFETs in the converter suffer the body diode reverse recovery in two-level mode leading to a lower conversion efficiency. In this paper, the cause of the body diode reverse recovery has been analyzed, the effects on reverse recovery by adopting different control schemes were discussed in detail, and the theoretical analysis were verified by the experimental results from a prototype with 400 V-800 V input and 54 V/20A output.