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

Flyback switching power supply and over-current protection method thereof

A switching power supply, flyback technology, applied in electrical components, irreversible AC power input into DC power output, output power conversion devices, etc. The effect of constant current overcurrent protection

Active Publication Date: 2011-01-19
奇瑞新能源汽车股份有限公司
View PDF4 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, it can be seen that the conventional flyback switching power supply cannot achieve constant current overcurrent protection during overload or short 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
  • Flyback switching power supply and over-current protection method thereof
  • Flyback switching power supply and over-current protection method thereof
  • Flyback switching power supply and over-current protection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Hereinafter, a description will be given of exemplary embodiments of the present invention with reference to the accompanying drawings.

[0026] image 3 It is a schematic circuit diagram showing a flyback switching power supply according to a preferred embodiment of the present invention, wherein the flyback switching power supply adopts a double closed-loop control method to realize constant current overcurrent protection.

[0027] image 3 The shown flyback switching power supply includes a transformer, the output voltage on the secondary winding side output circuit is Vo and the output current is Io, and a sampling resistor R1 for sampling the output current Io is connected in series on the output circuit, where the sampling resistor R1 One end of CGND is grounded, and the other end GNDO is connected to the inverting input end 2 of the operational amplifier 1 .

[0028] Such as image 3 In the shown flyback switching power supply, two operational amplifiers are u...

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 provides a flyback switching power supply and an over-current protection method thereof. The over-current protection method of the flyback switching power supply comprises the following steps of: starting a current close loop control circuit to output a first error voltage when an output current is more than a rated current; starting a voltage close loop control circuit to output a second error voltage when the output current is more than the rated current; converting the first error voltage into a first error current or the second error voltage into a second error current through an optocoupler; and controlling the output current based on the first error current or controlling the output voltage based on the second error current through a control chip. The over-current protection method is characterized in that the power is supplied to the current close loop control circuit, the voltage close loop control circuit and the optocoupler through a voltage stabilization chip so that the switching power supply outputs the constant output current when the output current is more than the rated current.

Description

technical field [0001] The invention relates to a flyback switching power supply and an overcurrent protection method thereof, in particular to a flyback switching power supply and a constant current overcurrent protection method for realizing constant current output during overcurrent. Background technique [0002] Flyback switching power supply has been widely used in various fields, figure 1 A schematic diagram of overcurrent protection of a conventional flyback switching power supply is shown, which has a current closed-loop control circuit and a voltage closed-loop control circuit. Among them, the current closed-loop control circuit is formed by the operational amplifier 1 and the diodes connected in series at the output terminal of the operational amplifier 1; the voltage closed-loop control circuit is formed by the operational amplifier 2 and the diodes connected in series at the output terminal of the operational amplifier 2. When the output current of the output ci...

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): H02M1/32H02M7/04
Inventor 汪建建
Owner 奇瑞新能源汽车股份有限公司
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