A control method for improving the light-load efficiency of the primary-side feedback active-clamp flyback converter
A flyback converter, primary-side feedback technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, high-efficiency power electronic conversion, etc. The effect of light load efficiency, reducing switching loss and improving light load performance
Active Publication Date: 2021-09-07
SOUTHEAST UNIV
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Problems solved by technology
[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 associated drawings. Preferred embodiments of the invention are shown in the drawings, but the 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.
[0026] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terms used in the description of the present invention are only for describing specific embodiments but not limiting the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0027] Figure 4 It is the circuit main structure diagram of the control system of the acti...
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The invention discloses 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, power transformation or power distribution. The method is implemented by a system including a sampling module and a digital control module. The voltage mean value calculation module, the period control module, the enable module and the PWM module form a control system under light load mode. The voltage mean value calculation module obtains the current large cycle output voltage mean value, The cycle control module judges the adjustment mode of the number of turn-on cycles of the two switch tubes in the next large cycle, and the enable signal module provides an enable signal for the large cycle. Error calculation module, PID module, DAC, comparator and PWM module compose the control system under heavy load mode. The switching signal between the light load mode and the heavy load mode is obtained by comparing the current threshold extracted from the sampled value of the output voltage with the preset value in real time. The solution of the invention is simple and easy to implement, low in cost, can reduce switching loss in light load mode, and improves circuit efficiency.
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, power transformation or power distribution. Background technique [0002] The power supply is an indispensable part of every 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 Power Supply. Switching power supply, also known as switching converter, is a power supply that uses modern power electronics technology to make the output voltage constant by adjusting the conduction ratio or frequency of switching devices. [0003] The continuous miniaturization of electronic equipment requires the size of the power supply to be miniaturized accordingly. The ...
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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