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Short circuit protection circuit of DC power supply

A short-circuit protection circuit, DC power supply technology, applied in emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc. The effect of small short-circuit current

Inactive Publication Date: 2008-03-05
SHENZHEN GOLD POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing short-circuit protection circuit of series-connected fuses, when a component of the communication system is damaged and causes a short-circuit, or the positive and negative poles of the DC source are short-circuited due to human error, it is easy to blow the series-connected fuse. After the fuse is blown, it needs to be dismantled. The machine needs to be replaced with a new fuse, which brings great inconvenience to the on-site installation operators or maintenance personnel

Method used

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  • Short circuit protection circuit of DC power supply

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Embodiment Construction

[0011] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] During the working process of the DC source, the output current will change according to the load. When the load encounters different abnormal conditions, a changing current will be generated. The current is sampled and sent to a comparison amplifier for comparison and amplification with a reference voltage. The voltage after comparison and amplification is controlled by the square wave output by the trigger to turn off the MOSFET switch. break, thereby realizing short-circuit protection and current-limiting protection, which is the working principle of the short-circuit protection circuit of the present invention.

[0013] The short-circuit protection circuit of the DC source is shown in Figure 1, including a current sampler, a controller and a MOSFET switch tube, and the controller includes a comparison amplifier, an output c...

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Abstract

This invention relates to a short-circuit protecting circuit for circuits provided by DC supply or storage batteries and circuits charged by storage batteries, in which, the protecting circuit is serial between a DC supply and a supplied device including a current sampling device, a controller and a switch tube, and the current sampling device tests current in the test circuit and outputs it to the controller, which controls on / off of the switch tube according to the current in the circuit, therefore it's not necessary to tear open or exchange new fuses when short circuit happens, besides, the short-circuit current is small and limit protection can be reached.

Description

technical field [0001] The invention relates to a short-circuit protection circuit of a DC power supply, in particular to a circuit powered by a DC power supply or a storage battery, and a short-circuit protection circuit in a circuit for charging the storage battery. Background technique [0002] The DC power is obtained by transforming the AC power through the rectification and filtering method, and the battery is also a kind of DC power. In the prior art, in order to prevent short circuit and protect the DC source, in the circuit powered by DC power supply and in the charging circuit of the battery, a fuse is connected in series in the input circuit. Once a short circuit occurs and the current in the circuit is too large, the fuse will Fuse, thus avoiding excessive current burning out the DC source. [0003] The DC source is an important power source for the communication system, and the short-circuit protection circuit is a key component to protect the DC source, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087H02H7/18
Inventor 刘世清
Owner SHENZHEN GOLD POWER TECH
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