| 摘要 |
PROBLEM TO BE SOLVED: To secure reliable opening/closing drive of a solenoid valve even when miniaturized, by highly accurately controlling a current passing through a coil with a pulse control system or the like. SOLUTION: In a latch type solenoid valve supplying power only when driving from a closed state to an open state or from the open state to the closed state, the current passing through the coil L is controlled within a prescribed range in accordance with power supply voltage. Accordingly the current applied to the coil for driving the solenoid valve 6 can be made constant, and the reliable opening/closing drive of the solenoid valve is possible. COPYRIGHT: (C)2004,JPO
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