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Primary side regulation control system and primary side regulation control method of active clamp flyback converter

A technology of flyback converter and primary side regulation, which is applied in the direction of control/regulation system, regulation of electric variables, conversion of DC power input to DC power output, etc. Successful development, non-linear changes in working waveforms, etc.

Active Publication Date: 2019-12-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the active clamp flyback converter, due to the complex working state and the nonlinear change of the working waveform, it is difficult to obtain accurate output voltage and output current through the voltage and current signals collected by the primary side, resulting in the use of primary side regulation The active clamp flyback converter has not been successfully developed

Method used

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  • Primary side regulation control system and primary side regulation control method of active clamp flyback converter
  • Primary side regulation control system and primary side regulation control method of active clamp flyback converter
  • Primary side regulation control system and primary side regulation control method of active clamp flyback converter

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Embodiment 1

[0062] Example 1. In this preferred embodiment, a secondary-side resonant active-clamp flyback converter with primary-side auxiliary winding is used, and the topological structure diagram of the converter is as follows figure 1 shown. The active clamp flyback converter consists of an input DC source V in , Transformer T r , resonant inductance L r , magnetizing inductance L m , main power tube S 1 , clamp tube S 2 , the clamp capacitor C cmp , the inductor current sense resistor R s , secondary rectifier diode D, resonant capacitor C r , the output filter capacitor C o , the output filter inductance L o , load impedance R L , auxiliary winding diode D aux , the auxiliary winding resistor R aux . where the resonant inductance L r , Exciting inductance L m , primary side auxiliary winding T aux can be regarded as a transformer T r a part of.

[0063] Resonant inductance L r Connect one end of the input DC source V in of the positive terminal, the resonant in...

Embodiment 2

[0065] Example 2. The structure of the primary regulation control system of the active clamp flyback converter proposed by the present invention is as follows: figure 2 shown. The control system includes an inductor current sampling circuit, a drain-source voltage sampling circuit, an auxiliary winding voltage sampling circuit, a gate driver, a control circuit with a controller as the core, and a differentiator. Among them, the control circuit with the controller as the core includes a voltage operation module, a current operation module, and a constant voltage and constant current function module.

[0066] The voltage operation module includes: a first comparator 1, a second comparator 2, a first analog-to-digital converter 4, and a voltage control unit; the inverting input terminal of the first comparator 1 receives the auxiliary winding voltage output by the auxiliary winding voltage sampling circuit , the inverting input terminal of the second comparator 2 receives the ...

Embodiment 3

[0078] Example 3. The primary side adjustment control method of the active clamp flyback converter proposed by the invention can realize the active clamp flyback converter working in a constant voltage control mode. When the constant voltage control mode is realized, only the voltage operation module is used to collect the auxiliary winding voltage and predict the output voltage. In this preferred embodiment, the primary regulation control method of the active clamp flyback converter samples the voltage, and the related waveforms are as follows image 3 shown.

[0079] image 3 Among them, from top to bottom are: main power tube S 1 The gate-to-source terminal voltage V gs_S1 and clamp tube S 2 The gate-to-source terminal voltage V gs_S2 Time-varying waveform, resonant inductor current i Lr and the magnetizing inductor current i Lm Time-varying waveform, secondary rectifier diode current i D and the resonant capacitor current i Cr time-varying waveform, the auxiliary...

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Abstract

The invention provides a primary side regulation control system and primary side regulation control method of an active clamp flyback converter and belongs to the technical field of primary side regulation control. The system comprises an inductive current sampling circuit, a drain-source voltage sampling circuit, an auxiliary winding voltage sampling circuit, a gate driver, a control circuit witha controller as a core, and a differentiator. The control circuit with the controller as the core comprises a voltage operation module, a current operation module and a constant-voltage constant-current function module. The active clamp flyback converter can accurately predict and calculate the primary sides of output voltage and output current while the working efficiency of the system is ensured, so the accurate primary side constant-voltage constant-current adjustment of the active clamp flyback topology is realized. By adopting the control system, the use of optical couplers and other isolation elements is reduced, the integration level of the system is improved, and very high output voltage precision can be obtained. In addition, the control system can be applied to a primary side resonance active clamping flyback topology and a secondary side resonance active clamping flyback topology.

Description

technical field [0001] The invention relates to the technical field of primary side regulation control, in particular to a primary side regulation control system and control method of an active clamp flyback converter. Background technique [0002] With the improvement of people's requirements for the size and charging speed of portable power adapters, traditional flyback converters, which are widely used in the field of low-power power supplies, are gradually not used due to low working efficiency and serious EMI problems. Compared with the traditional flyback converter, the active clamp flyback converter can realize the zero-voltage turn-on of the power tube on the primary side and the zero-current turn-off of the rectifier diode on the secondary side in the full load range, so it can obtain higher operating efficiency. Efficiency, lower EMI, higher operating frequency and wider input range have gradually attracted people's attention. [0003] The primary-side regulation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33515H02M3/33523H02M1/0009H02M1/0012H02M1/0058Y02B70/10
Inventor 钱钦松许胜有刘琦吴汪然孙伟锋时龙兴
Owner SOUTHEAST UNIV
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