| 摘要 |
A power supply circuit of a solenoid valve is provided to prevent wrong operation of a control unit and an error of a transistor by charging counter electromotive force generated in returning a solenoid to a condenser through a diode. A power supply circuit of a solenoid valve(23) includes a voltage boosting unit(21a) and a charge unit(21b). The voltage boosting unit boosts a low voltage supplied from a battery(22) at a predetermined ratio. The charge unit applies a constant voltage to the solenoid valve at all times by charging a current through a condenser before the predetermined voltage is applied to the solenoid valve. The voltage boosting unit drives the solenoid valve by boosting the low voltage to the predetermined voltage through a coil of the solenoid valve at the predetermined ratio.
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