Patent ID: 9634574
Date: 2017-04-25
CPC Classifications: H02M,Y02B

Claim:
1. An electric-power conversion system comprising: an AC/DC converter configured with a rectification circuit that is connected with a rear stage of an AC power source and rectifies an output of the AC power source and a semiconductor switching device connected between output terminals of the rectification circuit; a smoothing capacitor connected with a rear stage of the AC/DC converter via a rectifying device; a charging switch that is connected between a rear stage of the rectification circuit and the semiconductor switching device, that inputs an output of the rectification circuit to the semiconductor switching device when being turned on, and that cuts off an input to the semiconductor switching device when being turned off; and an inrush current prevention circuit having an inrush current prevention switch and a resistor that is connected with the rear stage of the inrush current prevention switch; wherein: the inrush current prevention switch comprises a semiconductor device, and the inrush current prevention circuit is connected in parallel with the charging switch.