With the rapid development of new energy vehicles

V2X Vehicle to Everything）technology has become an effective means for vehicle-grid-load interconnection and energy sharing.As the core component of V2X technology

the bidirectional DC-DC converter is a key device for energy interaction.Faced with the significant voltage fluctuations of power batteries

how to maximize weighted efficiency over a wide voltage range

reduce the number of components

and enhance power density has always been the goal pursued in the development of V2X bidirectional converters.This paper focuses on wide-range gain bidirectional quasi-single-stage isolated DC-DC converters

which summarizes and reviews the existing research from three aspects:converter topology

modulation strategy

and control.The paper also identifies the shortcomings and challenges of the current research.