Electric power steering controller for vehicle, has transistors that are turned on before relay is driven to turn on contacts of relay

摘要

The relay (6) having contacts connected respectively to an electric motor (1) and DC power supply switches between the motor and supply. A discharging circuit (17) having transistor, discharges a smoothing capacitor (3) connected with one of the contact of the relay. The transistors are turned on before starting operation of a relay to turn on the contacts.