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

Single-ended fly-back switching power supply

A switching power supply, flyback technology, applied in electrical components, adjusting electrical variables, instruments, etc., can solve the problems of complex PWM chip control loop design, unstable system operation, prolonged power supply design cycle, etc., to improve electromagnetic compatibility. The effect of capability, compact structure, and fewer components

Inactive Publication Date: 2012-05-16
张志远
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional single-ended flyback power supply is generally composed of a PWM control chip (such as UC3842) and a power switch tube (MOSFET is generally used when the frequency is high). An external drive circuit is required
In addition, the design of the flyback transformer is also a difficult point, which often leads to the extension of the power supply design cycle

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
  • Single-ended fly-back switching power supply
  • Single-ended fly-back switching power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The present invention adopts TOPSwitch and PI Expert to measure the switching power supply. When TOPSwitch is turned on, the secondary side rectifier diode D2 is cut off, and the energy of the output load is provided by C1 here; Reverse, the rectifier diode starts to conduct, the energy stored in the transformer is delivered to the load, and at the same time, the previously reduced energy of C1 is supplemented.

[0010] After setting up the test circuit, disconnect the feedback circuit of the control terminal of the chip, and add a low voltage of about 30V between the drain and source to perform an automatic restart test; channel 1 is the drain voltage waveform, and channel 2 is the control terminal voltage waveform. The control terminal voltage VC is maintained between 4.8 and 5.8V, which is formed by the high-voltage current source inside the chip continuously charging and discharging the control terminal capacitor; every 8 such charge and discharge cycles, the chip wi...

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 discloses a single-ended fly-back switching power supply. The invention relates to a switching power supply which is designed by adopting a TOP Switch and provides the single-ended fly-back switching power supply which has few devices, and is simple in structure and low in heating amount and operates reliably. The switching power supply is designed by adopting the TOP Switch and a power integrations (PI) Expert. The single-ended fly-back switching power supply is structurally characterized in that: the TOP Switch is turned on while a secondary rectification diode D2 is switched off, and energy which is output to a load at this time is supplied by C1; and after the TOP Switch is turned off, magnetic flux in a magnetic core of a transformer is reduced, the polarity of a secondary winding voltage is reversed, the rectification diode starts to be switched on, the energy which is stored in the transformer is transmitted to the load, and the reduced energy of the C1 is supplemented at the same time.

Description

technology field; [0001] The invention relates to a switching power supply designed with TOPSwitch, in particular to a single-end flyback switching power supply. Background technique: [0002] Due to its small size, light weight and high efficiency, switching power supply is widely used in various electrical equipment and systems, and its performance is directly related to the realization of the entire system function. There are many types of switching regulated power supplies. Among them, the single-ended flyback switching power supply is widely used in the field of low-power power supplies because of its simple circuit, fewer components required, and the ability to provide multiple isolated outputs. [0003] The traditional single-ended flyback power supply is generally composed of a PWM control chip (such as UC3842) and a power switch tube (MOSFET is generally used when the frequency is high). An external drive circuit is required. In addition, the design of the flyback...

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): H02M3/338
Inventor 张志远
Owner 张志远
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