Control method for improving light load efficiency of primary side feedback active clamping flyback converter
A technology of flyback converter and primary side feedback, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, high-efficiency power electronic conversion, etc., which can solve the problem of low working efficiency of flyback converter and achieve improvement Light-load efficiency, reduced switching loss, and improved light-load performance
Active Publication Date: 2020-09-18
SOUTHEAST UNIV
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[0010] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology, provide a control method for improving the light-load efficiency of the primary-side feedback active clamp flyback converter, and realize the shutdown of the active clamp converter in light-load mode The working cycle further reduces the energy loss of the circuit system during this time period, and solves the technical problem of low working efficiency of the flyback converter under light load conditions
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[0025] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in the specification of the present invention are only used to describe specific embodiments and not to limit the present invention. The term "and / or" as used herein includes any combination and all combinations of one or more related listed items.
[0027] Figure 4 It is the main circuit structure dia...
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The invention discloses a control method for improving the light load efficiency of a primary side feedback active clamping flyback converter, and belongs to the technical field of power generation, power transformation or power distribution. The method is realized through a system comprising a sampling module and a digital control module. A voltage mean value calculation module, a period controlmodule, an enabling module and a PWM module form a control system in a light load mode. The voltage mean value calculation module obtains a current large-period output voltage mean value, the period control module judges the adjustment mode of the opening period number of the two switching tubes in the next large period, and the enable signal module gives out a large-period enable signal. An errorcalculation module, a PID module, a DAC, a comparator and the PWM module form a control system in a heavy load mode. A switching signal of a light load mode and a heavy load mode is obtained by comparing a current threshold extracted from the output voltage sampling value with a preset value in real time. According to the scheme of the invention, the method is simple and feasible, the cost is low, the switching loss in a light load mode can be reduced, and the circuit efficiency is improved.
Description
Technical field [0001] The invention relates to a flyback converter control technology, in particular to a control method for improving the light-load efficiency of a primary-side feedback active clamp flyback converter, and belongs to the technical field of power generation, transformation or power distribution. Background technique [0002] The power supply is an indispensable part of each electronic device, and its performance is directly related to the technical indicators of the electronic device and whether it can work safely and reliably. The current mainstream application is Switch Mode PowerSupply. Switching power supply, also known as switching converter, is a power supply that uses modern power electronic technology to make the output voltage constant by adjusting the conduction ratio or frequency of the switching device. [0003] The continuous miniaturization of electronic equipment requires the size of the power supply to be miniaturized. The reduction in the size of ...
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IPC IPC(8): H02M3/335H02M1/088
CPCH02M1/088H02M3/33515H02M3/33523H02M3/33569H02M1/0054Y02B70/10
Inventor 徐申李旭涛曹宇孙乾坤陈明刚孙伟锋时龙兴
Owner SOUTHEAST UNIV