Power circuit based on resettable fuse and electronic product

A technology of self-recovery fuse and self-recovery insurance, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc. performance effect

Active Publication Date: 2015-07-29
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the prior art that the self-recovery fuse can not operate normally due to the increase of its own resistance value, the present invention proposes a power supply circuit based on the self-recovery fuse de

Method used

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  • Power circuit based on resettable fuse and electronic product
  • Power circuit based on resettable fuse and electronic product

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Embodiment Construction

[0024] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] This embodiment proposes a circuit design of a power supply circuit for electronic products designed using a self-recovery fuse as an over-current protection element. In order to solve the problem of using a self-recovery fuse as an over-current protection After the fuse was subjected to multiple overcurrent shocks, the power supply voltage transmitted to the system circuit was excessively reduced due to the increase of its own resistance, which then affected the normal operation of the system circuit. A redundant design scheme for the fuse path was proposed. That is, in the power supply line that transmits the input power, two fuse paths-the main path of the resettable fuse and the backup path of the resettable fuse are set at the same time, by connecting the main path of the resettable fuse and the backup path of...

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Abstract

The invention discloses a power circuit based on a resettable fuse and an electronic product. The power circuit is characterized in that a resettable fuse main path and a resettable fuse alternative path which are in parallel connection are disposed in a power supply circuit for conveying an input power supply; the voltage difference at two ends of the resettable fuse in the main path is collected, the resettable fuse main path is used to convey the input power supply if the voltage different is smaller than a set threshold V, or else the resettable fuse alternative path is used to convey the input power supply. By the arrangement, the power circuit and the electronic product have the advantages that the service cycle of the electronic product using the resettable fuse can be prolonged, excessively-large voltage drop of the fuse due to the fact that the resettable fuse bears excessively-large current impact and bears the impact for an excessively-long time, system operation instability and system failure are avoided, and the overall performance of the electronic product is evidently increased.

Description

technical field [0001] The invention belongs to the technical field of power circuits, and in particular relates to a power circuit designed with a self-recovery fuse and electronic products using the design of the power circuit. Background technique [0002] The self-recovery fuse PTC is an overcurrent protection element, which can automatically disconnect when the input current is too large, and cut off the input power to prevent damage to the system circuit due to excessive input current. Moreover, the fuse can be automatically closed after the input current returns to normal, and the power supply circuit of the input power supply can be re-connected to realize repeated use. [0003] In the power supply circuit designed by using the resettable fuse PTC, when the resettable fuse is used for overcurrent protection, the problem that the resistance value of the fuse increases with the increase in the number of times the fuse is impacted often occurs. If the current required...

Claims

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Application Information

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IPC IPC(8): H02H3/05H02H3/06
Inventor 李卫国
Owner QINGDAO GOERTEK
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