The three-phase output of the inverter is three-phase uncontrolled rectifier and LC low pass filter to obtain dc power. As input to the half-bridge dc-dc converter, the converter's closed-loop conditioning outputs stable and controllable DC power to power the charger. The half-bridge dc-dc converter topology consists of two parts, the first stage consists of two IGBT power switches in series and two DC side capacitors, and the second stage consists of two power diodes with full wave rectifier and LC filter circuits. The front and rear stages are connected via a transformer. The primary input of the transformer is connected to the midpoint of the IGBT bridge arm and the midpoint of the capacitor bridge arm with the ac pulse voltage of ±1/2 Udc2. After the subsequent transformer transformation and full-wave rectification, the pulse dc voltage can be obtained, and the stable dc current can be obtained after LC low-pass filtering. In this project, the topology of the half-bridge dc-dc converter is shown in figure 2-3. The output target of the converter is to provide a stable 110V DC power supply for the charger.