Power supply protection circuit, power supply and electronic equipment

Abstract

The embodiment of the invention discloses a power supply protection circuit, a power supply and electronic equipment. The power supply protection circuit comprises a protection branch circuit and a voltage division branch circuit, wherein the protection branch circuit is connected between a first power supply circuit and a second power supply circuit; the protection branch comprises at least two overvoltage protection devices, and the at least two overvoltage protection devices are connected in series between the first power supply circuit and the second power supply circuit, wherein the at least two overvoltage protection devices comprise a voltage limiting type protection device and a switch type protection device; the voltage division branch is connected with the protection branch in parallel, the voltage division branch comprises at least two resistive devices, and the at least two resistive devices are respectively connected in parallel with two ends of the at least two overvoltage protection devices so as to balance the voltage division proportion between the at least two overvoltage protection devices. Compared with the prior art, the embodiment of the invention can meet therequirements of power frequency resistance and lightning stroke residual voltage at the same time, and the practicability is high.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of electronic circuits, in particular to a power supply protection circuit, a power supply and electronic equipment. Background technique [0002] Power supplies are widely used in electronic equipment to provide electrical energy for electronic equipment. However, when events such as sudden power outages, sudden incoming calls, generator power supply, and man-made irregular operations occur, power supply interference such as operating overvoltage and power frequency overvoltage will often be caused. These power supply disturbances will cause serious consequences such as failure of overvoltage protection devices in the power supply, fire and the like. [0003] In the existing technology, the power supply circuit mostly uses a voltage-limiting protection device as an overvoltage protection device. If the withstand voltage of the voltage-limiting protection device is selected to be h...

AI Technical Summary

Problems solved by technology

However, when events such as sudden power outages, sudden incoming calls, generator power supply, and artificial irregular operations occur, power supply interference such as operating overvoltage and power frequency overvoltage will often be caused.

These power supply disturbances will cause serious consequences such as failure of overvoltage protection devices in the power supply, fires, etc.

[0003] In the existing technology, the power supply circuit mostly uses a voltage-limiting protection device as an overvoltage protection device. If the withstand voltage of the voltage-limiting protection device is selected to be high, its li

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