The push-pull mode switch power supply is chosen as the main circuit of the other voltages with PWM control circuit, over-current protection circuit, insulated drive circuit, mosfet buffer circuit and so on. 采用高效的推挽式电路作为中低压电源的主电路,并以PWM控制电路、隔离式驱动电路、过流保护电路、MOSFET缓冲电路、软启动电路、稳压电路等作为辅助电路。