| 摘要 |
PURPOSE:To stably control a solenoid valve regardless of fluctuation in power supply voltage and to lessen winding loss by applying a solenoid a holding current which is controlled to be constant-current at a lower level according to an output voltage and a reference voltage. CONSTITUTION:There is provide means which can supply the first reference voltage VR-1 controlled to be constant-voltage and the lower second reference voltage VR-2, and switch from the first reference voltage VR-1 to the second reference voltage VR-2 in the lapse of designated time after a signal is input. Further, there is provided means for applying a starting current controlled to be constant-current according to output voltage of a detection resistor 11 and the first reference voltage VR-1 to a solenoid 10 and a holding current controlled to be constant-current at a lower level according to the output voltage of the detection resistor 11 and the second reference voltage VR-2 by supply of the second reference voltage VR-2.
|
