Direct current power supply protection circuit and electronic device

Abstract

The present invention discloses a direct current power supply protection circuit and an electronic device. A first protection branch comprises a semiconductor discharge tube and a transient state suppression diode which are connected in series, a first DC circuit is accessed into a positive pole voltage, and a second DC circuit is accessed into a negative pole voltage; when a forward voltage between the first DC circuit and the second DC circuit is larger than a first preset voltage, the transient state suppression diode is conducted with the semiconductor discharge tube, and the first presetvoltage is the superposition of the clamp voltage of the transient state suppression diode and the breakover voltage of the semiconductor discharge tube; when a backward voltage between the first DC circuit and the second DC circuit is larger than a second preset voltage, the transient state suppression diode and the semiconductor discharge tube are two forward diodes connected in series for conduction. The direct current power supply protection circuit and the electronic device can reduce the residual voltage of the direct current power supply protection circuit, can reduce the chip loss andarea, can reduce the cost of the direct current power supply protection circuit and can achieve the effect of the miniaturization and the reverse connection prevention multiple protection of the direct current power supply protection circuit.

Description

technical field [0001] Embodiments of the present invention relate to semiconductor device technology, and in particular to a DC power supply protection circuit and electronic equipment. Background technique [0002] Electronic equipment has been widely used in automotive electronics, communications, new energy, security, consumer electronics, industrial electronics, medical electronics and other industries, and its performance is directly related to whether the related equipment can work safely and reliably. [0003] In order to ensure that electronic equipment can work safely and reliably, DC power supply protection circuits are often designed on the power ports of electronic equipment, such as overvoltage protection, overcurrent protection, and overtemperature protection. Among them, due to lightning strike or reverse connection of DC power supply, it is a common cause of overvoltage and damage to DC power supply circuit components. In the prior art, in order to prevent ...

AI Technical Summary

Problems solved by technology

However, the residual voltage of the TVS chip is high, the protection effect on the subsequent DC power supply circuit is poor, and there are problems of large chip power consumption, large area and high cost.

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