Supercharge Your Innovation With Domain-Expert AI Agents!

Variable turn-on time control method of CRM fly-back PFC (Power Factor Correction) converter

A technology of varying on-time and on-time, used in control/regulation systems, conversion of DC power input to DC power output, instruments, etc. wave standard, difficulty in meeting harmonic requirements, etc.

Active Publication Date: 2017-09-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some occasions with high requirements on input current harmonics, it is difficult to meet the relevant harmonic requirements even with the existing variable on-time control method
[0005] With the increase of the switching frequency range of the CRM flyback PFC converter, the influence of the CRM flyback PFC converter on the input current distortion in the actual resonance stage is more obvious, which is manifested by a large increase in the input current THD. control method, it is also difficult to make the CRM flyback PFC converter meet the corresponding harmonic standards

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
  • Variable turn-on time control method of CRM fly-back PFC (Power Factor Correction) converter
  • Variable turn-on time control method of CRM fly-back PFC (Power Factor Correction) converter
  • Variable turn-on time control method of CRM fly-back PFC (Power Factor Correction) converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The present invention controls the variable conduction time of the CRM flyback PFC converter under the condition of fixed input

[0085] figure 1 It is the control flowchart of the variable conduction time of the CRM flyback PFC converter under the fixed input condition of the present invention. image 3 It is an embodiment of the variable on-time control method of the CRM flyback PFC converter proposed in the present invention under a fixed input condition.

[0086] It is known that the input and output parameters of the CRM flyback PFC converter in this example are 220VAC / 50Hz, and the rated full-load power is P o =64W, output voltage V o =24V. It is known that the transformer primary side excitation inductance L of the CRM flyback PFC converter in this example m =300μH, the primary and secondary side turn ratio n=4, the primary side switching tube output junction capacitance C ds =313pF, secondary diode parasitic capacitance C j =50pF.

[0087] Select 101 mome...

Embodiment 2

[0106] The present invention controls the variable conduction time of the CRM flyback PFC converter under the general input condition

[0107] system

[0108] attached Figure 7 It is an embodiment of the variable on-time control method of the proposed CRM flyback PFC converter under the general input conditions (90-264VAC, 47Hz-63Hz). It is known that the input and output parameters of the CRM flyback PFC converter in this example are: 90V ~ 264VAC RMS input, 47Hz ~ 63Hz power frequency, output voltage V o =24V, rated full load power P o = 64W. In this example, the inductance value L of the magnetizing inductance of the primary side of the transformer is m =300μH, the primary and secondary side turn ratio n=4, the primary side switching tube output junction capacitance C ds =313pF, secondary diode parasitic capacitance C j =50pF.

[0109] In order to simplify the design, this example selects several RMS input line voltage calculations corresponding to the variable cond...

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

PropertyMeasurementUnit
Parasitic capacitanceaaaaaaaaaa
Login to View More

Abstract

The invention provides a variable turn-on time control method of a CRM fly-back PFC (Power Factor Correction) converter, and belongs to the field of AC-DC power conversion. The proposed control method considers the influence of a resonant stage in the actual work of the CRM fly-back PFC converter, and uses an output signal of a voltage error adjuster to carry out real-time transformation on a single stored variable turn-on time data table, so that the CRM fly-back PFC converter performs adaptive variable turn-on time control under a variable load condition, thereby obviously reducing the input current THD (Total Harmonics Distortion) in a full load range.

Description

technical field [0001] The invention relates to a variable conduction time control method suitable for a CRM flyback PFC converter, belonging to the technical scope of power conversion, in particular to the technical field of high-quality AC-DC power conversion. Background technique [0002] In recent years, power electronic devices have been widely used in rectification occasions, which has caused increasingly serious current harmonic pollution problems. In order to reduce the harm of current harmonics caused by power electronic devices, various harmonic standards promulgated have carried out the power factor (Power Factor, PF) and current total harmonic distortion (Total Harmonics Distortion, THD) that power electronic devices need to meet. Regulation. Flyback (Fly-back) power factor correction (Power Factor Correction, PFC) converters are widely used in various adapter power supplies. Generally, it can be divided into three types: transformer primary and secondary curre...

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): H02M3/335H02M1/42
CPCH02M1/4241H02M3/33515Y02B70/10Y02P80/10
Inventor 任小永郭哲辉吴羽陈乾宏张之梁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com