;Due to the instability of renewable energy, this thesis designs an isolated bidirectional DC/DC converter with adjustable power. It proposes on control the energy flow between DC bus and energy storage system. With this design of converter, the electrical energy can be bidirectionally flow to supplement the power required by the electrical system and improve the energy efficiency. The electric circuit of this paper is phase-shifted full-bridge/push-pull bidirectional circuit. Pulse phase modulation is used to achieve zero-voltage switching. The digital control uses the RX62T microcontroller which is produced by Renesas, it can perform analog-to-digital convertor, switching signal control and circuit protection mechanisms. When the system power is replenished, the converter will operate in the buck mode to charge the battery of energy storage system; otherwise, the converter will operate in the boost mode to discharge the battery of energy storage system to supply the system. Finally, this paper uses the circuit simulation software to verify system architecture and produces an isolated bidirectional DC/DC converter with soft switching. It confirms the feasibility of this architecture by the results.