Current-limiting protection circuit

A current-limiting protection and circuit technology, which is applied in the field of circuits, can solve problems such as poor practicability, and achieve the effect of preventing excessive current and enhancing stability and reliability

Active Publication Date: 2015-10-14
EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current limiting protection circuits will derate the output when the current is overloaded,

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
  • Current-limiting protection circuit
  • Current-limiting protection circuit
  • Current-limiting protection circuit

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0023] The invention discloses a current-limiting protection circuit, which is composed of a triode, a MOS tube and several resistors in view of the large output current of the drive circuit, and can quickly adjust the current overcurrent value according to different load requirements. When the current in the drive signal branch is lower than the overcurrent value, the power drive function is realized; when the current in the drive signal branch is higher than the overcurrent value, the triode and the MOS transistor form a dynamic balance of cascaded negative feedback, so that the MOS The tube works in the constant current region, and outputs an overcurrent signal and a constant current to provi...

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 invention is closes a current-limiting protection circuit. The current-limiting protection circuit comprises an overcurrent detection module, a power driving module and a switching control module, wherein when the value of current in a driving signal sub-circuit is higher than an overcurrent value, a fourth triode and an MOS tube form dynamic balance of cascaded negative feedback, so that the MOS tube works in a constant current region and constant current is output, and constant driving power is provided for a load; and an overcurrent signal is output through the overcurrent detection module. According to the current-limiting protection circuit, the current overcurrent value can be rapidly adjusted according to different load requirements, and a condition that the circuit reliability is reduced as the current in the driving signal sub-circuit of a driving power supply is too high, is prevented, so that the technical effects of enhancing the stability and the reliability of a driving circuit is realized, and the current-limiting protection circuit is simple and practical. A triode and MOS tube cascading form is adopted, and the dynamic balance between the triode and the MOS tube is formed through the closed loop negative feedback when the overcurrent occurs, so that the MOS tube works in the constant current region, and the overcurrent signal and the constant current are output; and the constant driving power is provided for the load to keep the capability of the driving circuit, and certain on-line maintaining time can be provided.

Description

technical field [0001] The invention relates to a current limiting protection circuit, belonging to the technical field of circuits. Background technique [0002] With the rapid development of integrated circuit technology, the power consumption of power products and power drive circuits continues to increase, especially when the output is overloaded or even short-circuited, the large current on the power tube will permanently damage the circuit chip and electronic products. In order to avoid this situation, an overcurrent protection circuit is usually added to the chip. In the power drive circuit, the over-current protection circuit can be roughly divided into shutdown mode and current-limiting mode according to different control modes. The current-limiting mode is widely used because of its current drooping characteristics, and the circuit system can automatically resume work after the fault is eliminated. application. However, most of the current limiting protection cir...

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
IPC IPC(8): H02H9/02
Inventor 朱震星于春香李金宝
Owner EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
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