A new power supply system for AC contactor ride-through

This paper describes a new power supply system that enables an AC contactor to ride through power grid disturbances. The proposed system is implemented in an electronic device that is connected to the contactor coil. The electronic device consists of a power conversion and excitation circuit, a control circuit, an immunity circuit and a shutdown circuit. It does not disturb the contactor operation and can be adapted to almost all types of electrical contactor. Experimental tests have demonstrated the effectiveness of the proposed electronic device.