| 摘要 |
PURPOSE:To execute phase angle control of a polyphase AC by one control signal by adjusting a generation time of a phase angle control signal based on a detected DC voltage, and inputting simultaneously said control signal to a switching element inserted into each phase, respectively. CONSTITUTION:A smoothing filter 11 is connected to three phase windings (a)- (c) of an AC generator 10 through output controlling thyristors TH1-3, respectively, and a DC output voltage is obtained. Also, this device is provided with a reference waveform generating circuit 13 for generating a triangular wave in accordance with an output voltage of a rectifying circuit 12. Moreover, a DC voltage of an output terminal OUT is inputted to a phase angle controlling circuit 15 through a voltage detecting circuit 14, and a transistor Q4 is brought to on.off-control by this circuit 15. In this way, by a three phase voltage induced by the AC generator 10, each thyristor TH1-3 is brought to phase angle control and made conductive successively, by which the output terminal OUT voltage is held at a voltage set by a Zener diode ZD2 and a resistance R1. |
