Power conversion device having initial charging circuit

摘要

A power conversion device 300 includes: an AC/DC converter section 10 which has an initial charging circuit 36 that initially charges a smoothing capacitor 22 provided at an output portion, and converts alternating current power into direct current power; a DC/DC converter section 11 which performs voltage conversion of direct current power supplied from the smoothing capacitor 22; and a control unit 5 which controls output of the AC/DC converter section 10 and output supplied from the DC/DC converter section 11. The control unit 5 performs a predetermined charging from the initial charging circuit 36 to the smoothing capacitor 22 at start-up of the AC/DC converter section 10, and starts the operation of the DC/DC converter section 11 after completion of charging, whereby the circuit can be protected from an inrush current at start-up.

主权项

1. A power conversion device, comprising:
an alternating current/direct current conversion circuit section which has a smoothing capacitor provided at an output portion and an initial charging circuit that initially charges said smoothing capacitor, and converts alternating current power into direct current power; a direct current/direct current conversion circuit section which has a switching element, and performs voltage conversion of direct current power supplied from said smoothing capacitor by controlling said switching element; and a control unit which controls input and output of said alternating current/direct current conversion circuit section and said direct current/direct current conversion circuit section, wherein said control unit performs a predetermined charging to said smoothing capacitor by said initial charging circuit and said alternating current/direct current conversion circuit section at start-up of said alternating current/direct current conversion circuit section, and starts operation of said direct current/direct current conversion circuit section after completion of charging of said smoothing capacitor by said initial charging circuit, wherein said alternating current/direct current conversion circuit section includes an inverter circuit which is connected to a single inverter or a plurality of inverters in series, said inverter having a direct current voltage supply and a plurality of semiconductor switching elements that perform charging and discharging of said direct current voltage supply, and wherein completion of charging of said smoothing capacitor is determined by voltage of said smoothing capacitor and voltage of said direct current voltage supply.