Electric-power conversion system having inrush current prevention circuit

摘要

The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit (14) connected with the rear stage of an AC power source, a smoothing capacitor (22) connected with the rear stage of the inverter circuit (14) by way of a rectifying device (20), a charging switch (2) that is connected with the front stage of the inverter circuit (14), that inputs an electric quantity based on an output of the AC power source (1) to the inverter circuit (14) when being turned on, and that cuts off an input of the electric quantity to the inverter circuit (14) when being turned off, and an inrush current prevention circuit (7) having an inrush current prevention switch (3) and an inrush current prevention resistor (4) that is connected in series with the rear stage of the inrush current prevention switch (3); the electric-power conversion system is characterized in that the inrush current prevention circuit (7) is connected in parallel with the charging switch (2).

主权项

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.