Resonant Converter for Battery Charging Applications With CC/CV Output Profiles

In this paper, a novel resonant circuit topology is proposed for battery charging applications. Compared with traditional implemented circuits, the proposed topology can provide constant current (CC) and constant voltage (CV) charging profiles for different battery states automatically. Specially, zero-voltage-switching (ZVS) turned on of switching devices can be realized at fixed operating frequency for different charging levels, which benefits the transferring efficiency and reduces the voltage stress of the switches. In addition, simple design methodology can be derived to improve system’s practicality and reliability, avoiding complex control strategy. Experimental results obtained from a 200 W prototype system show good agreement with calculated results, validating that the proposed topology can be used for battery charging systems.