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Overvoltage protection circuit and method

An overvoltage protection circuit and circuit technology, applied in the electronic field, can solve the problems of information loss, property loss, easy breakdown, overvoltage protection and overvoltage protection functions, etc.

Active Publication Date: 2015-02-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the process of realizing the above-mentioned load overvoltage protection, because the voltage difference between the drain and the source of the field effect transistor HQ is large at the moment of turning on and off, and the frequent turning on and off of the field effect transistor HQ , easy breakdown of the FET HQ
When the field effect transistor HQ is broken down, the BUCK switching power supply cannot continue to protect the load from overvoltage (that is, the overvoltage protection function of the BUCK switching power supply fails), and at this time the power signal is directly connected to the load to supply power for the load, which is easy burn out load
For common CPU, memory and hard disk loads, once burned, it will cause information loss and large property damage

Method used

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Embodiment Construction

[0084] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0085] Additionally, the terms "system" and "network" are often used herein interchangeably. The term "and / or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations. In addition, the character " / " in this article generally indicates that the contextual ob...

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Abstract

An embodiment of the invention discloses an overvoltage protection circuit and method, and relates to the technical field of electrons. The overvoltage protection circuit can prevent the problem that a load is burned out as voltage inputted to the load is too high. The overvoltage protection circuit comprises a switch power circuit, an overvoltage detection circuit and an input control circuit, a voltage input end of the overvoltage detection circuit inputs preset voltage, the other voltage input end of the overvoltage detection circuit is connected with a voltage output end of the switch power circuit or the voltage input end of the overvoltage detection circuit is connected with a voltage input end of the switch power circuit, the other voltage input end of the overvoltage detection circuit is connected with a voltage monitoring node of the switch power circuit, a voltage output end of the overvoltage detection circuit is connected with feedback voltage input end of the input control circuit, a power voltage input end of the input control circuit inputs a power signal VIN, and a voltage output end of the input control circuit is connected with a voltage input end of the switch power circuit.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an overvoltage protection circuit and method. Background technique [0002] The switching power supply is a power control device that adjusts the output voltage of the switching power supply by controlling the switching tube of the switching power supply to turn on and off, so as to obtain a stable output voltage. Among them, switching power supply is mainly divided into two categories: AC switching power supply and DC switching power supply. Step-down (BUCK) switching power supply is a common DC switching power supply. [0003] In the prior art, the BUCK switching power supply is mainly composed of a power control chip, two field effect transistors and an output inductor. The BUCK switching power supply controls the on or off of the two field effect transistors through the power control chip to adjust the output voltage of the BUCK switching power supply, so that the outpu...

Claims

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Application Information

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IPC IPC(8): H02H7/10
Inventor 董凌
Owner HUAWEI TECH CO LTD
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