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Buck circuit with overvoltage protection circuit

An overvoltage protection circuit and circuit technology, which is applied to emergency protection circuit devices, overvoltage-responsive protection, electrical components, etc., can solve problems such as back-end circuit damage, high output voltage, and voltage feedback circuit failure, and achieve Prevent overvoltage burning, protect electronic components, and ensure stable and safe operation

Active Publication Date: 2020-02-28
SUNWODA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the power converters using the Buck circuit all have the failure mode of the switch tube being damaged or the voltage feedback circuit failing, resulting in a high output voltage.
Most of the switching tubes use MOSFETs, and most of the failures of MOSFETs are due to internal low-impedance conduction, which is equivalent to the output voltage being equal to the input voltage, and it is easy to damage the back-end circuit (equipment)
Similarly, the failure of the voltage feedback circuit may also cause the output voltage to be too high

Method used

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  • Buck circuit with overvoltage protection circuit

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Embodiment Construction

[0018] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] 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 part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0020] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "the", "above" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to...

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Abstract

The invention discloses a Buck circuit with an overvoltage protection circuit. The Buck circuit with an overvoltage protection circuit comprises a Buck circuit, a heating device shorting circuit and asafety device F1. The heating device shorting circuit comprises a heating assembly R1, and the heating assembly R1 is tightly attached to the safety device F1. When the Buck circuit outputs an overvoltage, the heating device shorting circuit is connected, and the heating assembly R1 generates heat to cut off the safety device F1. According to the invention, when the output voltage is too high dueto failure of the Buck circuit, the heating device shorting circuit can be connected in time, and therefore, the heating component R1 is promoted to generate heat. Because the safety device F1 is tightly attached to the heating assembly R1, the heat of the heating assembly R1 can cut off the safety device F1, and the voltage input of the Buck circuit is disconnected. Therefore, the Buck circuit is prevented from outputting an over-high voltage, back-end equipment connected with the Buck circuit is prevented from being damaged due to overvoltage, electronic elements of the whole circuit are protected, and stable and safe operation of the circuit is ensured.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a Buck circuit with an overvoltage protection circuit. Background technique [0002] Buck circuit is a step-down chopper circuit, which is one of the basic DC-DC circuits. It is used for step-down conversion from DC to DC. The internal power conversion circuit of the electrical equipment adopts the Buck circuit, and its application range is very wide. [0003] The current power converters using the Buck circuit all have a failure mode in which the switch tube is damaged or the voltage feedback circuit fails, resulting in a high output voltage. Most of the switching tubes use MOSFETs, and most of the failures of MOSFETs are due to internal low-resistance conduction, which is equivalent to the output voltage being equal to the input voltage, and it is easy to damage the back-end circuit (equipment). Similarly, the failure of the voltage feedback circuit may also cause the ...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02H3/20H02M3/155
CPCH02H7/1213H02H3/20H02M3/155
Inventor 洪明深
Owner SUNWODA ELECTRONICS
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