Abstract: DSP was used as the processor for the traditional emergency power charger but the real-time control is poor. Therefore the three-phase PWM rectifier with the control chip of EP3C25E144C8N\FPGA is designed to solve this problem. This rectifier is designed with the double loop feedforward decoupling control based on SVPWM, multi-step constant current charging and VHDL language programme. The simulation and the result of the experiment results verify the excellence of the three-phase PWM rectifier.