Method for improving constant-voltage sampling precision of primary-side feedback flyback power supply during high-power working

A primary-side feedback, flyback power supply technology, applied in the direction of converting irreversible AC power input to DC power output, etc., can solve problems such as poor sampling accuracy, and achieve the effects of poor adjustability, low sampling accuracy and slow response.

Active Publication Date: 2017-03-22
SOUTHEAST UNIV
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Problems solved by technology

[0005] Aiming at the defect of poor sampling accuracy of the flyback power supply in the constant voltage state under the existing high voltage and high power conditions, the present invention provides a digital sampling method for improving the primary side feedback flyback power supply in the constant voltage state, by analyzing Factors that affect the sampling accuracy, sampling with sawtooth wave in DCM working mode; sampling with single-slope digital wave in CCM working mode and combined with reference voltage adjustment, by inserting DCM cycle, constantly updating the reference voltage in CCM mode, improving The sampling accuracy and constant voltage characteristics of high-power flyback power supply under constant voltage

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  • Method for improving constant-voltage sampling precision of primary-side feedback flyback power supply during high-power working
  • Method for improving constant-voltage sampling precision of primary-side feedback flyback power supply during high-power working
  • Method for improving constant-voltage sampling precision of primary-side feedback flyback power supply during high-power working

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[0026] 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.

[0027] 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.

[0028] The technical solutions of the present invention will be clearly and ...

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Abstract

The invention discloses a method for improving the constant-voltage sampling precision of a primary-side feedback flyback power supply. For the disadvantages of a traditional constant-voltage sampling strategy of the primary-side feedback flyback power supply under high power, traditional simulation-mode CCM (continuous current mode) fixed-point sampling strategy and digital approximation-type DCM (discontinuous current mode) sampling strategy are abandoned, and a digital slope sampling method is provided. A sawtooth wave is used for sampling in a DCM working mode by combining a comparator, and a single-slope digital wave is used for sampling in a CCM working mode; reference voltage in the CCM mode is continuously updated through inserting a DCM period by combining reference voltage adjustment; and the sampling precision and the constant-voltage characteristic are improved. By adopting a flexible digital sampling strategy, the effect of +/-2% of constant-voltage precision can be obtained, thereby improving the constant-voltage characteristic of a primary-side feedback flyback converter under high power.

Description

technical field [0001] The invention relates to an isolated switching power supply converter, in particular to a digital sampling method for improving a primary-side feedback flyback power supply in a constant voltage state, and is suitable for the primary-side feedback flyback power supply in high-power operation. Background technique [0002] With the rapid development of household electronic equipment, the demand for high-efficiency power supplies is also increasing, which leads to the rapid development of AC-DC power converters. The development of electronic equipment has put forward new indicators for AC-DC power converters, and the energy consumption and control accuracy of equipment have become the focus of the current power supply industry. In the field of power supply design, the flyback topology is widely used in power converters due to its simple structure, low cost, and wide input range. With the improvement of the output power of the flyback power supply, the s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06
CPCH02M7/06
Inventor 孙伟锋寇兴鹏沈乾陶思文徐申陆生礼时龙兴
Owner SOUTHEAST UNIV
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