A forced resonant flyback converter and zero voltage switch adaptive control method
A zero-voltage switching, flyback converter technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as large switching losses, achieve small device costs, overcome loss reduction, The effect of improving efficiency
Active Publication Date: 2022-04-12
SOUTHEAST UNIV
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[0007] The object of the invention of the present invention is to aim at the deficiency of above-mentioned background technology, provide a kind of ZVS self-adaptive control algorithm of forced resonance flyback converter, on the basis that forced resonance branch is applied to primary side feedback type flyback converter, The introduction of zero-voltage switch adaptive digital control algorithm accurately realizes the intelligent turn-on and turn-off of the forced resonant tube, and solves the problem that the flyback converter cannot achieve precise zero-voltage switch using a simple control algorithm in the full voltage and full load range Technical issues leading to excessive switching losses
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[0027] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The topology and waveform diagrams shown in the drawings are the preferred embodiments of the present invention, but the embodiments that can realize the application are not limited to the embodiments listed in the application. On the contrary, these examples are provided to facilitate a more thorough and comprehensive understanding of the inventive objectives of the present application.
[0028] The invention discloses a forced resonant flyback converter, the specific structure is as follows figure 1 As shown, a forced resonant flyback converter of the present invention includes a main circuit and a control circuit connected to the main circuit.
[0029] Wherein, the main circuit includes a transformer, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a forced resonance ...
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The invention discloses a forced resonance flyback converter and a zero-voltage switch self-adaptive control method, belonging to the technical field of power generation, power transformation or power distribution. A flyback converter includes a main circuit and a control circuit. The control circuit includes a digital constant voltage multi-mode module and a zero voltage switch module. The digital constant voltage multi-mode module is used to control the constant output voltage, including a two-wire sampling module, a PI compensation module, a mode judgment module, a control voltage module and a switch drive module. The zero-voltage switch module is used to control the opening and closing moments of the forced resonance tube, including a sampling module, a zero-voltage switch adaptive algorithm module, a forced resonance enabling module, a zero-crossing detection and a switch driving module. Through this adaptive control algorithm, the intelligent turn-on and turn-off of the forced resonant tube can be realized, and zero-voltage switching can be realized in the full voltage range. Compared with the traditional simple control algorithm that cannot accurately realize zero-voltage switching, the switching loss is greatly reduced, and the efficiency.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a forced resonant flyback converter and a zero-voltage switch self-adaptive control method. Background technique [0002] As a digital-analog hybrid control system, the flyback switching power supply can be divided into two categories: analog control and digital control, according to the different implementation methods of the feedback control loop. Compared with the analog control flyback switching power supply, the digital control flyback switching power supply has the advantages of strong reusability, high flexibility, easy real-time monitoring, strong anti-interference ability, and avoiding analog signal distortion. Therefore, digital chips are widely used in high-end power supplies with complex controls, and digital control methods are currently the mainstream control method for high-frequency, high-efficiency switching power supplies. [0003] With the dev...
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IPC IPC(8): H02M3/335H02M1/08
CPCH02M3/33592H02M3/33515H02M3/33523H02M1/083Y02B70/10
Inventor 徐申邹昊宸聂静雨史小雨孙伟锋时龙兴
Owner SOUTHEAST UNIV