Abstract: In the process of using wireless power transfer（WPT）technology to charge batteries，constant current （CC）-constant voltage（CV）charging mode is adopted to ensure battery life and safety. Therefore，a hybrid topology of series-series（SS）and inductor-inductor-capacitor（LLC）topology was proposed. Based on the SS topology，an additional capacitor is connected in parallel with a switch is connected in series on the primary side. On the secondary side，a switch is connected in parallel with the capacitor. When the switch is off，the system operates as the SS topology with a constant current. When the switching condition is satisfied，the system is switched to LLC topology by closing the switches，so that the system has constant voltage output. Two kinds of WPT system topologies were modeled and analyzed by KVL equations，and the system parameters and switching conditions satisfying CC/CV mode were established. The experimental prototype was built according to the theoretical analysis. The experimental results show that the system can work in CC and CV modes，and meet the charging requirements of the system. In CC mode，the maximum system efficiency can reach up to 95%.

      Key words: wireless power transfer（WPT）；hybrid topology ；constant current（CC）/constant voltage（CV）