| 摘要 |
PURPOSE:To detect the voltage of the output circuit of a sine-wave output inverter operated in parallel with another power supply accurately. CONSTITUTION:The output circuit of an inverter 1 with an AC filter constituted of a reactor 2 and a capacitor 3 is composed of a voltage detector 4 detecting inverter output voltage V1 on the input side of the AC filter, an AC filter voltage-drop detector 5 detecting the voltage loss V2, of AC filter itself, subtracters 6 and 7 mutually arithmetically operating reference voltage 8 and said two detecting voltage V1 and V2 and a voltage control circuit 10, to which the detecting value of the substracter 7 is input through a gain 9 and which controls the inverter 1. |
