Two-way power supply automatic switching power supply circuit
An automatic switching, dual-circuit power supply technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of low reliability, complex structure, large size, etc., to achieve simple circuit, small size, reliability high effect
Inactive Publication Date: 2016-09-21
AVIC TECH XIAMEN ELECTRIC POWER TECH CO LTD
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The invention provides a two-way power supply automatic switching power supply circuit, and aims at solving the problems that the original two-way power supply automatic switching power supply circuit is complicated in structure, large in size and low in reliability. The two-way power supply automatic switching power supply circuit comprises an AC power supply A, an AC power supply B, a selection control unit and an interlock control unit, wherein the selection control unit and the interlock control unit are mutually connected; the interlock control unit comprises an AC contactor KM1 and an AC contactor KM2 which are in interlock connection; a normally open contact KM1C of the AC contactor KM1 is connected between a live wire of the AC power supply A and a load in series; a normally open contact KM2C of the AC contactor KM2 is connected between the live wire of the AC power supply B and the load in series; and the selection control unit is used for controlling selection of suction of the normally open contact KM1C of the AC contactor KM1 or the normally open contact KM2C of the AC contactor KM2 and avoiding a short circuit caused by competition of two ways of power supplies when the AC power supply A and the AC power supply B are simultaneously powered on.
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