| 摘要 |
PROBLEM TO BE SOLVED: To shorten a response time in cutting electric power supply while reducing power consumption in a driving circuit of a solenoid valve.SOLUTION: A solenoid valve driving device includes a first capacitor C104 supplying electricity to one of terminals of a solenoid valve, a first switch circuit TR118 connected to an earth-side terminal of the solenoid valve, a first diode D122 in which an anode is connected between the earth-side terminal of the solenoid valve and the first switch circuit, a second capacitor C126 for accumulating counter electromotive force energy from the solenoid valve flowing in through the first diode, and a switching circuit network 136, SW130, SW132, D128 switching the connection between the first capacitor and the second capacitor in parallel or in series. The switching circuit network connects the first and second capacitors in parallel, when the electric power is supplied to the solenoid valve, to charge the first and second capacitors, and then connects the first and second capacitors in series to accumulate the counter electromotive force energy in cutting power supply to the solenoid valve, in the second capacitor. |
