Abstract: To describe the operation mechanism of series resonant capacitor charging power supply(SR-CCPS) which is a high-order, multi-operating-mode nonlinear system visually, a hybrid automata model is built in this paper utilizing hybrid system theory. Based on the model, a piecewise linear(P-L) charging control method is proposed to realize multi-speed charging for S-R CCPS. The simulation results have verified the validation of the proposed model and method.