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A device power failure protection circuit

A technology of power-down protection and discharge circuit, which is applied in the direction of circuit devices, electrical components, emergency power supply arrangements, etc., can solve problems such as equipment damage, and achieve the effect of avoiding repetitive output

Active Publication Date: 2019-05-28
SHENZHEN STREAMING VIDEO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a device power-down protection circuit, which aims to solve the problem that the existing power-down protection circuit causes the device to enter a cycle of power-on and power-off during the protection process, causing damage to the device. question

Method used

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  • A device power failure protection circuit
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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. 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] figure 1 The structure of the device power-down protection circuit provided by the embodiment of the present invention is shown, and for the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0020] A device power-down protection circuit, the device power-down protection circuit comprising:

[0021] DC conversion power supply circuit 1;

[0022] When the external power supply of the DC conversion power supply circuit 1 loses power, an uninterruptible power supply 2 for maintaining power supply for the DC conversion power supply circui...

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Abstract

A device power-down protection circuit, the device power-down protection circuit sets the effective input voltage of the enable signal of the DC conversion power supply circuit (1) higher than the minimum acceptable voltage value of the DC conversion power supply circuit (1), and utilizes the uninterruptible power supply discharge circuit ( 3) Inhibit the voltage rebound of the uninterruptible power supply (2) when switching between heavy and light loads, thereby avoiding the repetitive output of the output power of the DC conversion power supply circuit (1), and avoiding the use of the existing power-down protection circuit in the protection process The equipment enters a cycle of power-on and power-off process, causing damage to the equipment.

Description

technical field [0001] The invention belongs to the technical field of electronic protection equipment, in particular to an equipment power-down protection circuit. Background technique [0002] Electronic equipment that still needs to work for a certain period of time when the external power is cut off or undervoltage, such as a car DVR. When the external power is cut off or undervoltage, it is usually the built-in farad capacitor or battery of the device to maintain the power energy required for the device to enter the shutdown process. There is a fatal flaw in many existing electronic devices when using Farad capacitors or batteries: Farad capacitors or batteries enter a low voltage value under load, and Farad capacitors or batteries at this voltage value will not continue to maintain electronic equipment; but Once the farad capacitor or battery enters light load or zero load, the voltage of the farad capacitor or battery will immediately rebound with a relatively large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
CPCH02M1/32H02M1/325H02M3/00H02J9/04
Inventor 蒋建兵
Owner SHENZHEN STREAMING VIDEO TECH
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