| 摘要 |
PURPOSE:To obtain highly reliable control operation by connecting gates which are opened and closed in response to the respective output signals of multiplexed detecting circuit in series, and performing switching based on the conditions that all gates are opened or closed. CONSTITUTION:A reversible power converter TH is provided between an AC bus line AL and the reversible input and output of the power, and selectively operates either of a thyristor circuit THF or THR based on the transmitting direction of the power. The transmitting direction of the multiplexed power is detected by power transmitting direction detecting circuits DCD1 and DCD2. The zero current state of the DC bus line of the thyristor circuits detected by zero current detecting circuit ZCD1 and ZCD2. A flip flop circuit is operated by both detector circuits, and a plurality of the gates B1-B4 are opened and closed by the outputs. Only when it is detected that the gates B1 and B2 and B3 and B4, which are connected in series, are all opened or closed by a detector DET, the outputs which supply the gate signals are generated. |
