| 摘要 |
PURPOSE:To prevent the shortage of the igniting force by providing a light emission diode for emitting light by a current flowing to diodes, a photodiode for receiving the light, and a second capacitor connected in parallel between the photodiode and the gate cathode of a thyristor. CONSTITUTION:In a cycle in which an AC power source 1 applies a positive voltage to a point (a) and a cycle in which the AC power source applies a negative voltage to a point (b), a capacitor 4 is charged with a voltage having a polarity reverse to the initial polarity, and a current flows through a closed circuit formed by capacitor 4, transformer 5, diode 10 and capacitor 4, in this sequence. By this current a voltage capable of sufficiently emitting light a light emission diode 9 connected in parallel to the diode 10 is generated. Accord ingly, a voltage is generated in a photodiode 8 by the light emission of the diode 9, and a charge is stored in a capacitor 13. When a power supply to the diode 10 is completed, the capacitor 13 discharges the charge, and a current flows to the gate of a thyristor 3. Then, the thyristor 3 is turned on again and a damping oscillation occurs and a discharge effect is produced.
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