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

A pulse-skipping mode psm control method suitable for primary-side feedback flyback converter

A flyback converter, primary-side feedback technology, used in control/regulation systems, conversion of DC power input to DC power output, instruments, etc. The problem of large variation range is disadvantageous, to achieve the effect of saving chip area, easy filtering, and facilitating integration

Inactive Publication Date: 2017-01-25
SOUTHEAST UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Secondary-side feedback AC-DC switching power converters usually use PSM or BURST control mode to improve light-load efficiency by turning off a part of the switching cycle at light load. This method has a simple circuit structure, but it cannot be applied in traditional control schemes. In the feedback structure of the primary side, because the voltage on the secondary winding will decay and oscillate once a switching cycle is turned off, so that it is no longer possible to detect the correct V knee Feedback digital signal
However, the primary-side feedback AC-DC switching power converter can only use the pulse frequency modulation mode (PFM) at light loads. The efficiency of this method is lower than that of PSM or BURST mode at light loads, and there is a wide range of frequency variations Conducive to post-stage filtering, complex circuit structure, and poor EMI performance

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
  • A pulse-skipping mode psm control method suitable for primary-side feedback flyback converter
  • A pulse-skipping mode psm control method suitable for primary-side feedback flyback converter
  • A pulse-skipping mode psm control method suitable for primary-side feedback flyback converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0021] The PSM control method of the present invention can adaptively adjust the number of PSM jump cycles and the peak current of the primary side according to the working state of the circuit, so that the output voltage of the primary side feedback flyback converter is constant, and the efficiency under light load of the system is effectively improved. And the output voltage ripple is reduced. At the same time, the PSM control mode has the advantages of fast response speed, good electromagnetic compatibility, strong robustness, and strong anti-interference ability under light load conditions.

[0022] figure 1 It is a circuit example of a PSM control system suitable for the primary side feedback flyback converter of the present invention. The main topology is an AC-DC primary side feedback flyback converter, and the PSM control system samples the kne...

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 pulse hopping mode PSM control method suitable for a primary side feed-back fly-back converter. The method comprises the following steps: indirectly sampling output voltage through an auxiliary winding; outputting the value of the output voltage through a comparison module; selecting a proper duration hopping mode from a duration hopping control module by adding the judgment of a peak current module and a duration hopping calculation module; finally, outputting a proper duty cycle through a DPWM module to drive a switch MOS transistor and control the voltage-stabilized output of digital power. Through the adoption of the method, on one hand, the light load efficiency can be high by switching off a part of circuit modules of a system in a part of switch duration; on the other hand, compared with the conventional PFM control method, the pulse hopping mode PSM control method has the advantages that PSM control is simpler, filtering can be easier due to a controllable frequency range, and the EMI can be reduced effectively.

Description

technical field [0001] The invention belongs to the field of digital switching power supplies, and in particular relates to a pulse-skipping mode PSM control method suitable for a primary-side feedback flyback converter. The method can improve the light-load efficiency of the primary-side feedback flyback converter. Background technique [0002] With the increasing development and wide application of portable electronic products, the isolated AC-DC flyback switching power converter has a simple circuit structure, can efficiently provide multiple DC outputs, and realizes complete isolation from input to output, and is also No need for output filter inductors, small size, high power density, and low manufacturing cost, thus occupying a large market in power adapters. [0003] Traditional flyback AC-DC switching converters use secondary side feedback, that is, optocouplers are used to achieve output voltage feedback and electrical isolation. However, the current transfer ratio...

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 Patents(China)
IPC IPC(8): H02M3/335
CPCH02M1/44H02M3/33523
Inventor 徐申倪丹丹王冲程松林孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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