| 摘要 |
PURPOSE:To allow high response sine wave voltage control by providing a voltage control means for subjecting the three phase voltages of a three-phase inverter to simultaneous average value control and a phase voltage control means for controlling each phase voltage of the three-phase inverter that the line voltage becomes sinusoidal. CONSTITUTION:Since the DC power supply voltage VDC fluctuates significantly in the case of a vehicle power supply a divider 37 produces a signal 1/VDC which is fed, as a feedforward signal, to the output of an amplifier 13 through an adder 35. The signal 1/VDC is multiplied by a phase reference voltage Vu at a multiplier 15 and the output voltage of the inverter is controlled constant regardless of the fluctuation of the VDC In order to compensate for voltage drop or the like, an output V40 from a voltage reference generator 40 is compared with a signal V14 obtained by subjecting the three phase voltages detected by a voltage detector 11A to full-wave rectification through a rectifier 14. The error of voltage waveform is then amplified through an amplifier 13 and added through an adder 35 thus correcting the average value of the voltage. |
