Control method for auxiliary switching tube of active clamp flyback converter

A technology of auxiliary switch tube and flyback converter, which is applied in the conversion equipment with intermediate conversion to AC, control/regulation system, conversion of DC power input to DC power output, etc., can solve the problem of low efficiency and improve efficiency. , the effect of reducing no-load loss and switching loss

Inactive Publication Date: 2011-07-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF5 Cites 40 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional active clamp flyback control circuit is

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
  • Control method for auxiliary switching tube of active clamp flyback converter
  • Control method for auxiliary switching tube of active clamp flyback converter
  • Control method for auxiliary switching tube of active clamp flyback converter

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] (1) Combination image 3 At time t0, the auxiliary switch S2 is turned off, and the primary switch S1 and the auxiliary switch S2 are in the off state at the same time. t 1 At the moment the primary side switch tube S1 is turned on, the primary side current rises, the transformer stores energy, and the auxiliary switch tube S2 and the output rectifier diode D are turned off. The magnetizing inductance Lm and the leakage inductance Lr are charged linearly. The energy of the clamp capacitor Cr remains unchanged, and the voltage at both ends remains unchanged.

[0018] (2)t 2 At the moment, the primary switch S1 is turned on and turned off, and the resonant inductor current charges the parasitic capacitor C1 in a resonant manner. Due to the large magnetizing inductance Lm, the voltage Vds across the drain source of the primary switch S1 rises approximately linearly.

[0019] (3)t 3 At a moment, Vds rises to Vi+Vc, at this time the energy in the leakage inductance Lr is stored ...

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 relates to a control method for an auxiliary switching tube of an active clamp flyback converter. In the flyback converter, severe energy loss and voltage spike of a main switching tube are caused due to leakage inductance of a transformer and leakage inductance of circuits. The conventional solution mainly comprises methods for solving the problems by using residual current device (RCD) clamp, liquid crystal display (LCD) clamp and active clamp, wherein an active clamp circuit can effectively recover leakage inductance energy and obviously improve the efficiency. The invention provides a novel control method on the basis of the conventional active clamp flyback converter topology. In the conventional control method, a primary side switching tube is in complementary conduction with an auxiliary switching tube in each period; and in the control method, the primary side switching tube is switched on in each period, the auxiliary switching tube is controlled by setting voltage of a clamp capacitor in the clamp circuit, and when the voltage of the clamp capacitor reaches the set value, the auxiliary switching tube is switched on. Compared with the prior art, the method has the advantages that: the switching loss of the auxiliary switching tube can be reduced; and more importantly, the efficiency of the circuit can be greatly improved under a light load, and the no-load loss is reduced.

Description

technical field [0001] The invention relates to a control method for an auxiliary switching tube of an active clamp flyback converter, which belongs to a power electronic converter. Background technique [0002] There are three traditional control methods for flyback converter leakage inductance recovery as follows: [0003] 1: RCD clamp circuit [0004] The RCD clamping circuit has the simplest structure, the lowest cost, and is easy to implement, but all the energy in the leakage inductance is consumed in the snubber resistor, which reduces the efficiency of the converter. It is suitable for occasions that do not require high efficiency and strictly control costs. [0005] 2: LCD clamp circuit [0006] The LCD clamping circuit can realize passive and lossless leakage inductance energy feedback, but it needs an external inductance, and the parameter setting is difficult, but the large LC resonant current at high frequency increases the conduction loss of the power switch,...

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): H02M3/28H02M3/335
Inventor 刘硕倪建军张方华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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