Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Over current and over voltage protection circuit and signal source circuit

A technology of overcurrent and overvoltage protection and signal source, which is applied in the direction of emergency protection circuit device, protection for overvoltage response, protection for overcurrent response, etc., and can solve problems such as reducing circuit output accuracy

Inactive Publication Date: 2007-08-15
SUPCON GRP +1
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide an overcurrent and overvoltage protection circuit to solve the problem that the internal resistance of the overcurrent and overvoltage protector reduces the output accuracy of the circuit

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
  • Over current and over voltage protection circuit and signal source circuit
  • Over current and over voltage protection circuit and signal source circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Overcurrent and overvoltage protectors are often used in circuit design to protect the internal circuit from being damaged under overcurrent and overvoltage conditions. Generally, an overcurrent and overvoltage protector is directly connected in series in the circuit, but no matter Any kind of overcurrent and overvoltage protection device has a certain internal resistance, which reduces the load capacity of the circuit and affects the output accuracy of the circuit. This has become a key constraint factor in the design of high-precision circuits.

[0031] The basic idea of ​​the embodiment of the present invention is to use the voltage clamping unit and the overcurrent conduction unit to clamp the voltage, and to use the principle of virtual short and virtual break of the operational amplifier, so that during normal operation, the overcurrent in the circuit The voltage at both ends of the overvoltage protector is kept equal, so as to eliminate the influence of the intern...

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

The disclosed overcurrent over-voltage protection circuit comprises: a protector with its B-end connected with the inverted input of an OA whose positive input end earthes and output end connects with one end of a second protective resistor, a first protective resistor with ends conencted with the second protective resistor and the protector A-end respectively, a voltage- clamp unit with connection port connected the wire between two resistors, and a over-current turn-on unit connected with the wire between protector and the inverted input of the OA. This invention eliminates the inner resistance effect of the protector.

Description

technical field [0001] The present invention relates to overcurrent and overvoltage protection technology, and more specifically relates to an overcurrent and overvoltage protection circuit and a signal source circuit. Background technique [0002] In circuit design, in order to avoid damage to the system due to human misoperation (mistakenly connecting the output terminal to the input terminal or the connected signal exceeds the measurement range of the system itself), the circuit input terminal or the signal source output terminal is used to avoid damage to the system. The method of adding an overcurrent and overvoltage protection device on the connecting line, as shown in Figure 1, the circuit includes an input terminal, an output terminal, an internal circuit and an overcurrent and overvoltage protection device, and the overcurrent and overvoltage protection device is connected in series in the On the connection line between the input terminal and the output terminal, th...

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): H02H3/08H02H3/10H02H3/20
Inventor 李堂忠丁云单明星
Owner SUPCON GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com