| 摘要 |
A power converter for a railway vehicle includes a step-up/down chopper 4 that steps up or steps down a voltage received from a DC power supply 1 and outputs the stepped up/down voltage to a DC-AC inverter device 6, which converts the DC power into three-phase AC power and supplies the converted power to an AC motor 7. The step-up/down chopper steps down the DC supply voltage when the output of the inverter decreases and steps up the DC supply voltage when the output of the inverter increases. The output of the inverter may be one of: a frequency of the three-phase AC voltage of the inverter; a voltage amplitude of the three-phase AC voltage of the inverter; a rotation frequency of the AC motor; and a speed of the railway vehicle. By reducing the voltage on the DC side of the inverter, losses caused by harmonic current can be reduced. |
