Patent ID: 7903383

Claim:
A solenoid valve driving circuit in which, after a first voltage is impressed on a solenoid coil of a solenoid valve for driving said solenoid valve, a second voltage is impressed on said solenoid coil and a driven state of said solenoid valve is maintained, the solenoid valve driving circuit being electrically connected, respectively, to a direct current power source and to said solenoid coil, and further comprising a switch controller, a switch, and a current detector, wherein said current detector detects a current flowing through said solenoid coil, and outputs a detection result, as a current detection value, to said switch controller, wherein said switch controller generates a first pulse signal based on a comparison between a predetermined activation current value and said current detection value, and a second pulse signal based on a comparison between a predetermined holding current value and said current detection value, and supplies said first pulse signal and said second pulse signal to said switch, and wherein said switch applies a power source voltage of said direct current power source as said first voltage to said solenoid coil during a time period when said first pulse signal is supplied thereto, and applies said power source voltage as said second voltage to said solenoid coil during a time period when said second pulse signal is supplied thereto.