The content of this paper is the bidirectional vehicular charger in the bidirectional DC/DC converter, to charge the battery needs to meet the battery voltage range, so the output voltage range of the converter is very wide, and the efficiency of the requirements are also very high, so as to reduce the converter heat, to adapt to the higher environmental temperature in the car, at the same time the volume and power density of the converter also have very strict requirements. Based on these requirements for bidirectional DC/DC resonant converter, an asymmetric CLLC bidirectional full-bridge DC/DC resonant converter topology is adopted. This paper adopts the control method of frequency conversion control. When the converter works in the inductive region, its voltage gain decreases with the increase of frequency, so the control is simple and direct.