ON-VEHICLE RELAY DRIVE CIRCUIT AND ON-VEHICLE EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a relay drive circuit that drives a relay by a constant current for reducing an excessive operation power and that has a simple and low-cost configuration.SOLUTION: A relay drive circuit 10 driving an on-vehicle relay 2 comprises: a switching element SW1 for making a current flow in a coil L1 of the relay 2; a current detection resistor RS detecting a current flowing in the coil L1; and a controller 11 controlling the switching element SW1. The controller 11 is configured to feed back the current detected by the current detection resistor RS to intermittently operate the switching element SW1, and to apply a constant current lower than a rated current applied at a rated voltage operation of the relay 2 to the coil L1 to drive the relay 2.