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Flyback converter and its output voltage acquisition method and device

A flyback converter and output voltage technology, applied in output power conversion devices, DC power input into DC power output, instruments and other directions, can solve the problem that the output voltage cannot be used with two wires, and achieve the effect of ensuring accuracy

Active Publication Date: 2022-05-06
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to provide a flyback converter and its output voltage acquisition method and device for the problem that the current flyback converter cannot use two-wire sampling when the output voltage is large.

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  • Flyback converter and its output voltage acquisition method and device
  • Flyback converter and its output voltage acquisition method and device
  • Flyback converter and its output voltage acquisition method and device

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Embodiment Construction

[0052] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

[0053] 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 descr...

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Abstract

The present invention relates to a flyback converter and its output voltage acquisition method and device, wherein the output voltage acquisition method includes the following steps: acquiring the reference output voltage of the flyback converter; During the reset time of each switching cycle, sample the current output voltage of the flyback converter, where M is a positive integer; according to the reference output voltage and the current output voltage, use the dichotomy method to approach the current output voltage successively until the end of M switching cycles, Obtain the output voltage of the flyback converter. Therefore, when the output voltage is relatively large, the accuracy of the acquisition can be guaranteed by adopting the dichotomous successive approximation method to obtain the output voltage of the flyback converter.

Description

technical field [0001] The invention relates to the technical field of power converters, in particular to a flyback converter and an output voltage acquisition method and device thereof. Background technique [0002] As the development of electronic equipment tends to be portable, isolated power converters have developed rapidly. Among them, flyback converters occupy a major position in the power adapter and charger market due to their advantages of high efficiency, simple structure, and low cost. . [0003] The traditional PSR (Primary Side Regulation) flyback converter obtains the output voltage of the flyback converter by sampling the voltage on the auxiliary winding, but due to the conduction voltage drop and conduction resistance of the secondary diode , will cause a large output voltage error, and when the output voltage is large, the slope of the voltage on the auxiliary winding before the inflection point will be very small, and it can be approximated as DC after vo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/0025H02M3/33515Y02B70/10
Inventor 孙伟锋张华鑫张琥余梦霖赵思宇徐申时龙兴
Owner SOUTHEAST UNIV