| 摘要 |
PROBLEM TO BE SOLVED: To provide a solenoid valve control device, surely detecting lowering of voltage drop and a sudden stop of feeding power to close a self-retaining solenoid valve and holding down wasteful power consumption to the utmost. SOLUTION: This solenoid valve control device includes: a driving circuit 3 for exciting the self-retaining solenoid valve 2 in the opening direction or in the closing direction; an excitation control part for controlling swithing of exciting direction of the driving circuit 3 according to an opening and closing control signal COM; a power supply side capacitor means C<SB>1</SB>parallel connected to a power supply 5 for supplying power to the excitation control part; a pressure up circuit 7 for boosting the voltage of the power supply 5 and applying the same to the driving circuit 3; a drive side capacitor means C<SB>2</SB>parallel connected to the driving circuit 3 on the output side of the pressure up circuit 7 to hold the driving voltage of the solenoid valve 2; and a power supply voltage monitoring control means for conducting the control to switch the current direction in the driving circuit 3 to the closing direction of the solenoid valve 2 when the voltage applied to the power supply side capacitor means C<SB>1</SB>is a predetermined threshold or less. COPYRIGHT: (C)2005,JPO&NCIPI
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