AN2626移相ZVS全桥DC / DC转换器的MOSFET的体二极管恢复机制

AN2626移相ZVS全桥DC / DC转换器的MOSFET的体二极管恢复机制

AN2626
Application note
MOSFET body diode recovery mechanism in a phase-shifted
ZVS full bridge DC/DC converter

Introduction
The ZVS exploits the parasitic circuit elements to guarantee zero voltage across the
switching device before turn on, eliminating hence any power losses due to the
simultaneous overlap of switch current and voltage at each transition [1].
In order to allow the ZVS condition, the intrinsic body diode of the MOSFET has to conduct;
in no or low load operation the extremely low reverse voltage, could be not sufficient to