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Method for improving stability of output constant voltage of primary side feedback flyback power supply under CCM

A technology of primary side feedback and flyback power supply, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, electrical components, etc., to achieve the effect of expanding universality, low cost, and ensuring ripple

Active Publication Date: 2016-09-28
SOUTHEAST UNIV
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Problems solved by technology

[0007] Aiming at the defects of the CCM constant voltage strategy of the existing primary-side feedback flyback power supply, combined with the advantages of digital control and easy compensation, the present invention provides a method for improving the output constant voltage stability of the primary-side feedback flyback power supply under CCM. The method utilizes the approximation mode detection and adaptive parameter adjustment, combined with two different sampling mechanisms of DCM and CCM, to improve the constant voltage stability of the PSR flyback power supply under CCM operation and heavy load switching

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  • Method for improving stability of output constant voltage of primary side feedback flyback power supply under CCM
  • Method for improving stability of output constant voltage of primary side feedback flyback power supply under CCM

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Embodiment Construction

[0023] It should be noted from the following discussion that alternative embodiments of the structures and methods disclosed herein will readily be identified as feasible alternatives that may be employed without departing from the principles of the disclosure.

[0024] Reference will now be made in detail to several embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Note that wherever possible, similar or identical reference numerals may be used in the figures and may indicate similar or identical functionality. The drawings depict embodiments of the present disclosure for purposes of illustration only. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the embodiments described herein.

[0025] The technical solutions of the present invention will be clearly and ...

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Abstract

The invention discloses a method for improving stability of output constant voltage of a primary side feedback flyback power supply under CCM on the basis of the current primary side feedback type flyback power supply CMM constant voltage control. The method of the invention combines with the digital feedback technology, provides voltage constant control with a digital approximation type mode detection strategy and a self-adaptive parameter regulation strategy, effectively distinguishes a DCM mode and a CCM mode through introducing the approximation type mode detection, and improves sampling stability under various modes. When a big load is changed, the method of the invention fully utilizes advantages of the stable state and constant voltage of the CCM through adaptively regulating reference voltage and PI parameters, corrects CCM sampling errors in a stepped manner and eliminates instability of constant voltage caused by CCM reference voltage hard regulation. The method for improving stability of output constant voltage of the primary side feedback flyback power supply under the CCM enables a PSR flyback power supply to satisfies that a voltage constant precision is + / -1% in a range of big power full load, realizes stable load regulation of a big CCM application and further expands universality of the primary side feedback type flyback type switching power supply.

Description

technical field [0001] The invention belongs to the technical field of isolated switching power supply converters, and in particular relates to a method for improving the output constant voltage stability of a primary side feedback flyback power supply under CCM (continuous current mode). Background technique [0002] In recent years, with the update and progress of interconnected mobile electronic devices, the relationship between electronic devices and people's work and life has become increasingly close. As an essential part of various electronic equipment, power supply directly affects the technical performance indicators and working reliability of electronic equipment. The high power, miniaturization, and portability requirements of electronic products and their charging adapters have become the focus of the industry. There is mutuality and commonality in driving industries. At present, the scientific and technological progress of the battery industry and the use of n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/14
CPCH02M1/14H02M3/33515H02M3/33523H02M1/0012
Inventor 孙伟锋沈乾黄智陶思文徐申陆生礼时龙兴
Owner SOUTHEAST UNIV
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