Sinusoidal ripple current charging system with PLL function

This paper proposed a sinusoidal ripple current charging system with PLL (Phase-Locked-Loop) function, which is used to charge the battery with battery resonant charging frequency. The proposed system uses a resonant frequency tracker, which is mainly constructed by the phase-locked-loop, so that the features of detecting, tracking and locking in the resonant charging frequency can be achieved. Finally, a prototype is simulated to verify the performance.