Contactor power supply control circuit

The utility model discloses a contactor power supply control circuit which is connected between an alternating-current control power supply and a contactor operation coil. The circuit comprises a transformer, first and second rectifier bridge circuits, a time-delay circuit, a switch circuit and a diode. The transformer is a double-coil output transformer. One output terminal of the transformer is sequentially connected with the first rectifier bridge circuit, the time-delay circuit and the switch circuit, and is used for rectifying an alternating-current high voltage output by the transformer into a direct-current high voltage. The outer output terminal of the transformer is sequentially connected with the second rectifier bridge circuit and the diode, and is used for rectifying an alternating-current low voltage output by the transformer into a direct-current low voltage. The control circuit can automatically adjust and output operation voltages required by the contactor in a start stage and an attraction stage. The control circuit can be added to contactors of various types to reduce power consumption of the contactors and reduce coil temperature rise of the contactors. Besides, the control circuit can reduce the working noise of the contactors, thereby having the functions of protection, energy conversation and environmental protection.