| 摘要 |
PURPOSE: A solenoid valve driving device is provided to decrease consumed power with reduced heating and smaller circuit size by replacing cement resistance inside a drive device for a circuit composed of coil and transistor. CONSTITUTION: Upon input of a primary control signal of short pulse, a drive signal generation unit(10) generates a drive signal for opening a solenoid valve(SV). A primary transistor(Q11) and a secondary transistor(Q12) are turned on. Drive power(VB) is supplied to the solenoid valve through the secondary transistor for opening. With a second control signal input in a long pulse signal, a third transistor(Q21) is turned on for turning on a fourth transistor. A current amount adjusting unit(40) converts a signal output from a maintaining signal generating unit(20) to a current signal of regular value for outputting to the solenoid valve. According to an oscillating signal(CLK) input, a fifth transistor(Q41) is turned on to induce a signal and to output through a first diode(D41) and a second diode(D42). The signal output from the first diode maintains an opening state of the solenoid valve. Thereby, the current adjusting unit does not consume unnecessary current output from the maintaining signal generating unit and receives current only when required for reducing current consumption not needed.
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