| 摘要 |
PURPOSE: To provide a power conversion device suited to minimize the rush current of a large d.c. smoothing capacitor generated by a change in the voltage of a.c. power supply for restraint of over-charging, and minimize a variation in operation starting time for better operation. CONSTITUTION: This power conversion device consists of an a.c. power source, a PWM converter, a PWM inverter, an d.c. smoothing capacitor connected between the converter and the inverter, a first contactor 8 connected between the converter and the a.c. power source, and an a.c. motor for driving an electric vehicle. This power conversion device is also provided with an initial charging circuit for charging the d.c. smoothing capacitor through the second contactor 17 from the a.c. power source, and a means 100 which closes the second contactor for the initial charging of the d.c. smoothing capacitor to a fixed value, and adjusts the initial charging voltage according to a change in the a.c. power voltage when turning on the first contactor. |
