| 摘要 |
PROBLEM TO BE SOLVED: To accurately execute the phase control by generating a synchronizing pulse signal with the pre-decided phase in one cycle of the phase voltage on one phase in a triple-phase AC commercial electric source, using the generated position as the starting point, calculating plural first and second phase operating signals having a phase different interval of plural first output coils, and also, the phase operating signals adding ignition angles and supplying a rectified circuit. SOLUTION: In a phase operating circuit 7, a reference phase ignition angle is calculated from the rising time of the synchronizing phase signal Va, and the first phase operating signal Vb and the second phase operating signal Vc are outputted. The pre-decided value adds the operating ignition angleαn to 30 deg., 150 deg. and 270 deg. as the first setting values and the operating ignition angleαn to 90 deg., 210 deg. and 330 deg. as the second setting values. In a first and a second phase control driving circuits 9, 10, the first and the second phase operating signals Vb, Vc are received, and a first and a second ignition pulse signals Vf, Vg are generated and inputted into a first and a second three-phase half- wave control recifier circuits 11, 12.
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