| 摘要 |
PROBLEM TO BE SOLVED: To realize a phase control device which keeps a zero-crossing signal waveform by the secondary side output of a power transformer constant free from the load fluctuations of a supply voltage and power circuit. SOLUTION: A diode bridge for phase control and a diode bridge for power supply are connected to the secondary side windings of the power transformer, the minus side terminals of these diode bridges are connected to each other, and the diode bridges are connected to the ground of the power circuit via a resistor 17 for detecting the load and the parallel circuit of a capacitor 18. An output by a comparator comparing the output voltage of the diode bridge for phase control with a voltage obtained by dividing the output of the diode bridge for power supply is made to be a zero-crossing signal waveform. COPYRIGHT: (C)2005,JPO&NCIPI
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