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Synchronous rectification control system and control method for secondary side resonance active clamping flyback

A technology of synchronous rectification and synchronous rectifier tube, which is applied in the direction of control/regulation system, output power conversion device, DC power input conversion to DC power output, etc. It can solve the problem of large voltage ripple at the output terminal and reduce the voltage. Effects of waveform, loss reduction, accurate turn-on and accurate turn-off

Active Publication Date: 2020-06-09
连云港杰瑞电子有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The topology of the secondary resonant active clamp flyback converter is as follows: figure 1 As shown, on the basis of the traditional active clamp flyback converter, a capacitor C with a relatively small capacitance is introduced on the secondary side r As a resonant element, this leads to a large output voltage ripple, so it is necessary to insert an LC filter circuit between the load resistor and the resonant capacitor to reduce the output voltage ripple

Method used

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  • Synchronous rectification control system and control method for secondary side resonance active clamping flyback
  • Synchronous rectification control system and control method for secondary side resonance active clamping flyback
  • Synchronous rectification control system and control method for secondary side resonance active clamping flyback

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Embodiment 1

[0037] Example 1. The topology of a secondary resonant active clamp flyback converter in a preferred embodiment is as follows figure 2 As shown, the flyback converter includes: input DC voltage source V in , Transformer T r , Resonant inductance L r , Exciting inductance L m , Primary power tube S 1 , primary side clamp tube S 2 , clamp capacitor C clamp , main output circuit synchronous rectifier tube SR, secondary resonant inductor L o , Secondary side resonant capacitor C r , output filter capacitor C o , main load impedance R L , auxiliary output loop synchronous rectifier SR1, auxiliary load impedance R 1 .

[0038] Resonant inductance L r and magnetizing inductance L m can be regarded as a transformer T r part of which the resonant inductance L r Connect one end of the input DC voltage source V in of the positive terminal, the resonant inductance L r The other end is connected to the magnetizing inductance L m one end of the transformer T r One end of...

Embodiment 2

[0047] Example 2. The determination of the turn-on time and turn-off time of the synchronous rectifier SR in the main output loop of the secondary side resonant active clamp flyback converter belongs to two different periods, and the same detection hardware and control logic can be used, only at the time point difference. Therefore, the present invention proposes to use the first comparator 6 to determine the turn-on time of the synchronous rectifier SR of the main output loop, and to use the second comparator 9 to determine the turn-off time of the synchronous rectifier SR of the main output loop. A fixed first threshold voltage V is set to the first comparator 6 inside the microcontroller 5 th1 , set the second threshold voltage V for the second comparator 9 th2 .

[0048] By adopting the synchronous rectification control method of the secondary side resonant active clamp flyback proposed by the present invention, the setting of the state detection time period of the sync...

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Abstract

The invention discloses a synchronous rectification control system and control method for secondary side resonance active clamping flyback and belongs to the technical field of synchronous rectification control methods. The synchronous rectification control system comprises an auxiliary output loop output voltage sampling circuit, a main output loop output voltage sampling circuit, a main output loop resonant capacitor voltage sampling circuit, a microcontroller and a gate driver. On the basis of the working characteristics of a secondary side resonance active clamping flyback converter, the control system directly detect resonance capacitor voltage and output voltage in the main output loop of the secondary side of the secondary side resonance active clamping flyback converter and outputvoltage in the auxiliary output loop of the secondary side of the secondary side resonance active clamping flyback converter; working waveform oscillation is reduced through synchronous rectificationcontrol; the loss of the secondary side resonance active clamping flyback converter is reduced; and the working efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the technical field of synchronous rectification control methods, in particular to a synchronous rectification control system and a control method for secondary resonance active clamp flyback. Background technique [0002] In low-power power supply systems, the flyback converter has been widely used due to its simple circuit structure, fewer components required, electrical isolation of input and output, and easy multi-channel output. However, due to the existence of leakage inductance, the flyback converter will generate a large peak voltage when the primary switch tube is turned off, thereby increasing the voltage stress of the power tube, and even breaking down the power tube in severe cases. In order to effectively limit the leakage inductance peak, a flyback converter with an RCD clamp circuit is proposed, but the passive clamp circuit consumes the energy in the leakage inductance in vain and cannot greatly improve the syst...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10
Inventor 王廷营张明子唐海瑞许胜有钱钦松孙伟锋刘传亮朱民杰吴超徐一民
Owner 连云港杰瑞电子有限公司
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