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Protection circuit

A technology for protecting circuits and power supply circuits. It is applied in the direction of protection against undervoltage or no-voltage. It can solve problems affecting the normal operation of electronic equipment and achieve the effect of ensuring safe operation.

Active Publication Date: 2020-06-02
BEIJING UNISTRONG SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the embodiment of the present application provides a protection circuit, which can solve the problem that the output voltage of the switching power supply in the prior art is lower than the rated voltage of the electronic equipment, which affects the electronic equipment. problem with normal work

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Embodiment Construction

[0046] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0047] see figure 1 , which is a schematic structural diagram of a protection circuit provided in an embodiment of the present application.

[0048] The protection circuit provided by the embodiment of the present application includes: a first Zener diode DW1, an undervoltage protection module 100 and a switch module 200;

[0049] The cathode of the first zener d...

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Abstract

The invention discloses a protection circuit, and the circuit comprises a first voltage stabilizing diode, an undervoltage protection module and a switch module; the cathode of the first voltage stabilizing diode is connected with the positive output end of the power supply, and the anode of the first voltage stabilizing diode is connected with the negative output end of the power supply and the under-voltage protection module; the under-voltage protection module is used for outputting a first control signal to the control end of the switch module when the first voltage stabilizing diode is not broken down; and the switch module is used for controlling the disconnection of a power supply loop between the power supply and the electronic equipment when receiving the first control signal, sothe problem that the normal operation of the electronic equipment is influenced when the output voltage of the power supply is smaller than the rated voltage of the electronic equipment is avoided, and the operation safety of the electronic equipment is ensured. And the switch module is also used for controlling the power supply loop to be conducted when the first control signal is not received, so as to supply power to the electronic equipment.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a protection circuit. Background technique [0002] At present, electronic equipment has become an indispensable part of the field of information technology and industrial automation. Among them, switching power supplies (such as DC switching power supplies) are widely used in information technology equipment and industrial automation equipment because of their easy installation, high efficiency, and reliability. [0003] During the use of the switching power supply, if the output voltage value is lower than the rated voltage value of the electronic equipment receiving power, it will affect the normal operation of the electronic equipment, and in severe cases, it will cause damage to the electronic equipment and cause unnecessary property loss. . Contents of the invention [0004] In view of this, the embodiment of the present application provides a protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/24
CPCH02H3/24
Inventor 张雪涛
Owner BEIJING UNISTRONG SCI & TECH
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