| 摘要 |
PURPOSE:To enable to perform a long-hour continued operation at an instantaneous interruption by a method wherein the output peak value of the inverter is controlled at a constant value, and the peak charging voltage is utilized by having a parallel connection through the intermediates of a commercial power source and a rectifier. CONSTITUTION:Capacitors 21a-21e are charged from an AC power source 1 by the first DC input obtained via rectifiers 20a-20e, through the intermediary of a transformer 6, and the second DC input obtained from the output terminal of the PWM inverter 4 via rectifiers 25a-25e through the intermediary of a transformer 26, and said capacitors 21a-21e are used as the DC power source to be used to control a power converter. The output frequency of the PWM inverter is reduced so that the voltage on the DC power source generated by the second DC input will be brought to the prescribed value with which the power converter will be controlled, and the capacitors 21a-21e are charged at the peak value of said PWM inverter output voltage. |
