SOLENOID VALVE CONTROL DEVICE

摘要

Disclosed is a solenoid valve control device provided with: a first relay (20) connected in series to a drive coil of a solenoid valve (30) between output terminals (11a, 11b) of a rectifier circuit (11); a photocoupler (31) configured to output a voltage of a GND level when a current equal to or greater than a predetermined level is flowing in a contact (20a) in the first relay (20) and output a voltage of a V5 level when the current equal to or greater than a predetermined level does not flow in the contact (20a) in the first relay (20); and an integration circuit (40) configured to smooth an output voltage Val from the photocoupler (31). When an output voltage (Vbl) from the integration circuit (40) is not greater than a first threshold value (Vtl), a microcomputer (1a) detects that the first relay (20) is in an on state.