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
View PDF0 Cites 10 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Short circuit protection circuit of DC power supply

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087H02H7/18
Inventor 刘世清
Owner SHENZHEN GOLD POWER TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap