Large-current low-surge power supply circuit

Abstract

A large-current low-surge power supply circuit comprises a power supply input end, an energy absorption element connected with the power supply input end, a relay connected with the energy absorption element in parallel, a power supply rectification module connected with the energy absorption element, a power supply output end connected with the power supply rectification module, and a delay conduction circuit connected with the power supply output end. The delay conduction circuit is also connected with the relay; wherein the switch end of the relay is connected with the energy absorption element in parallel, and the control end of the relay is connected with the delay conduction circuit. The delay conduction circuit comprises a first resistor and a triode which are connected in series, and a polar capacitor which is connected in parallel with the first resistor and the triode; and the positive electrode side of the polar capacitor is connected with the first resistor. The energy absorption element is a negative temperature coefficient thermistor. The beneficial effects of the utility model lie in that through the circuit which is conducted in a time-delay manner, the surge is staggered and then the relay is closed, so that the surge current when the power supply equipment is electrified can be reduced, and the electric efficiency of the power supply equipment can be prevented from being reduced by the energy absorption element.

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