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Buck-flyback integrated single-switch tube power factor correction converter

A power factor correction, flyback transformer technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, high-efficiency power electronic conversion, etc. , to achieve the effect of low cost, reduced complexity, and reduced total harmonic distortion

Pending Publication Date: 2022-05-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the dead zone of the input current cannot be eliminated and the control circuit is complicated in the current power factor correction converter, the present invention provides a GaN-based buck-flyback integrated single-switch power factor correction converter. The buck-flyback integrated single-switch power factor correction converter includes: input AC power supply, rectifier bridge BR, step-down power factor correction converter, flyback power factor correction converter, GaN power switch tube, output capacitor C, Output load R L and control circuits;

Method used

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  • Buck-flyback integrated single-switch tube power factor correction converter

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Embodiment 1

[0047] This embodiment provides a GaN-based buck-flyback integrated single-switch power factor correction converter. The buck-flyback integrated single-switch power factor correction converter includes: an input AC power supply, a rectifier bridge BR, step-down power factor correction converter, flyback power factor correction converter, GaN power switch, output capacitor C, output load R L and control circuit;

[0048] Both ends of the rectifier bridge BR are connected to both ends of the input AC power supply;

[0049] The step-down power factor correction converter and the flyback power factor correction converter share the GaN power switch and adopt a connection structure of input parallel connection and output parallel connection. The input end of the parallel structure is connected to the rectifier bridge BR, and the output end is connected to the rectifier bridge BR. connected with the output capacitor C;

[0050] The output capacitor C, the output load R L connected...

Embodiment 2

[0053] This embodiment provides a GaN-based buck-flyback integrated single-switch power factor correction converter. The buck-flyback integrated single-switch power factor correction converter includes: an input AC power supply, a rectifier bridge BR, step-down power factor correction converter, flyback power factor correction converter, GaN power switch, output capacitor C, output load R L , control circuit, input filter circuit and RCD absorption circuit;

[0054] Both ends of the rectifier bridge BR are connected to both ends of the input AC power supply;

[0055] The step-down power factor correction converter and the flyback power factor correction converter share the GaN power switch tube and adopt the connection structure of input parallel and output parallel, the input end of the parallel structure is connected to the rectifier bridge BR, and the output end is connected to the output capacitor C;

[0056] Output capacitor C, output load R L connected in parallel, and...

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Abstract

The invention discloses a buck-flyback integrated single switching tube power factor correction converter, and belongs to the technical field of switching power supplies. The converter comprises an input AC power supply, a rectifier bridge BR, a step-down power factor correction converter, a flyback power factor correction converter, a GaN power switch tube, an output capacitor C, an output load RL and a control circuit. A step-down-flyback integrated topology is adopted, aiming at the phenomenon that input current is purely in a dead zone when input voltage in a step-down unit is lower than output voltage, the influence of the dead zone of the input current is eliminated through conduction of a flyback unit, total harmonic distortion is reduced, the power factor of the converter is improved, and the converter reaches the IEC61000-3-2 C type standard; besides, the step-down unit and the flyback unit share one GaN switching tube by adopting an input-parallel output-parallel structure, so that the converter only needs one set of control circuit, the complexity of the circuit is reduced, the cost is low, and the reliability is high.

Description

technical field [0001] The invention relates to a step-down-flyback integrated single-switch tube power factor correction converter, which belongs to the technical field of switching power supplies. Background technique [0002] The traditional AC-DC converter is composed of a rectifier bridge and a filter capacitor composed of an uncontrollable diode or a phase-controlled device. The input current of this rectifier is distorted, not a sine wave, and contains higher harmonics. At the same time, the phase difference with the input voltage is large. , the power factor is small, and the polluted power grid affects the use of other electrical equipment. In order to improve the power factor, there are two directions, one is to make the input voltage in the same phase as the input current, and the other is to make the input current sinusoidal with the input voltage. The AC-DC power conversion technology that realizes this function is called power factor correction (Power Factor C...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/42H02M1/14H02M1/36H02M1/08
CPCH02M7/219H02M1/4233H02M1/14H02M1/36H02M1/08Y02B70/10
Inventor 曹通杨国锋秦世清谢峰蒋学成叶炳杰李婷何映谊张秀梅陈国庆
Owner JIANGNAN UNIV