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Control system and method of active clamping flyback converter

A flyback converter and control system technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as slow reflection speed and adjustment speed

Active Publication Date: 2020-08-25
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the delay effect of components such as transformers and output capacitors, the response speed and adjustment speed of the peak current mode control are much slower when the load changes suddenly.

Method used

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  • Control system and method of active clamping flyback converter
  • Control system and method of active clamping flyback converter
  • Control system and method of active clamping flyback converter

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Embodiment Construction

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] figur...

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Abstract

The invention relates to a control system and method of an active clamping flyback converter. The method comprises the following steps of sampling the output voltage of the secondary side of a transformer, the current of a rectifier diode and the current of an excitation inductor, according to the current sampling result of the rectifier diode, obtaining the variable quantity of the peak current of the rectifier diode relative to the previous moment as a peak current difference value, comparing the sampled output voltage with a reference voltage through an error compensator, and performing error compensation to obtain a compensation current, superposing the peak current difference value and the compensation current and then inputting into the first input end of the comparator, and inputting the current of the excitation inductor into the second input end of the comparator, and enabling the driving module to perform switching control on the main switching tube and the clamping switchingtube according to the output of the comparator. The load adjustment speed of the active clamping flyback converter can be accelerated.

Description

technical field [0001] The invention relates to a flyback converter, in particular to a control system and method for an active clamp flyback converter. Background technique [0002] As people's requirements for adapters or chargers with smaller volumes and faster charging speeds increase, traditional RCD clamp flyback or quasi-resonant flyback converters, which are widely used in low-power power supply applications, cannot meet people's needs gradually. Compared with traditional flyback converters, active clamp flyback converters can realize zero-voltage turn-on (ZVS) of the primary side power transistor and zero-current turn-off (ZCS) of the secondary side rectifier diode, with EMI interference and low noise , no transformer leakage inductance peak, power tube and rectifier diode voltage stress and other advantages, so that it can have higher efficiency and greater power density, which has gradually attracted the attention of researchers. [0003] Peak current mode contro...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33569H02M3/33507H02M1/0003
Inventor 钱钦松许胜有周伍清吴志斌苏巍肖金玉刘琦孙伟锋时龙兴
Owner SOUTHEAST UNIV
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