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Buffer circuit for BUCK converter

A technology of buffer circuit and converter, which is applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion device, etc., to achieve the effect of improving efficiency, simple control circuit and reducing loss

Pending Publication Date: 2018-05-22
CHIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the defects that the lossy snubber circuit used in the above-mentioned BUCK converter affects the efficiency of the converter, and provides a snubber circuit for the BUCK converter. The BUCK converter adds a snubber circuit on the power tube VT1 and the freewheeling diode VD1, and the snubber The circuit greatly suppresses the voltage and current peaks during the switching process of the power device, reduces the turn-on and turn-off losses of the power device, and improves the conversion efficiency of the BUCK converter; there is no need for an auxiliary switching tube buffer circuit, the converter has high efficiency, and no auxiliary Switch tube drive circuit, simple control circuit

Method used

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  • Buffer circuit for BUCK converter

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Embodiment Construction

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] combine figure 1 , a snubber circuit for BUCK converter, including power tube VT1, diodes D1, D2, VD1, resistors R1, R2, R3, Ro, capacitors C1, C2, C3, Co, inductors Lm, L1, input voltage Uin , the output voltage Uout; the positive pole of the input voltage Uin is connected to the resistor R1 and the collector of the power tube VT1, the ot...

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Abstract

The invention provides a buffer circuit for a BUCK converter. The buffer circuit comprises a power tube VT1, diodes D1, D2 and VD1, resistors R1, R2, R3 and Ro, capacitors C1, C2, C3 and Co, inductorsLm and L1, input voltage Uin and output voltage Uout. The BUCK converter is additionally provided with the buffer circuit on the power tube and a fly-wheel diode, and the buffer circuit greatly suppresses the voltage and current peaks in a switching process of a power device, reduces the losses caused by turning on and off the power device, and improves the conversion efficiency of the BUCK converter. An auxiliary switch tube buffer circuit is not required, so that the converter is high in efficiency; an auxiliary switch tube drive circuit is also not needed, so that circuit control is simple.

Description

technical field [0001] The invention relates to the technical field of buffer circuits, in particular to a buffer circuit for a BUCK converter. Background technique [0002] With the continuous improvement of my country's manufacturing industry and the implementation of the national "casting and welding" policy, the total cutting volume of steel as the main raw material has been increasing, which has put forward cutting efficiency, cutting quality, environmental protection and product cost. With higher requirements, the demand for a high-power plasma cutting power supply with excellent performance and high reliability is becoming more and more urgent. The cutting power supply is the core of the air plasma cutting machine. According to the plasma arc load characteristics and cutting process requirements, the plasma cutting power supply applies modern power electronics theory and automatic control theory to realize high-efficiency conversion and control of electric energy. The...

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Application Information

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IPC IPC(8): H02M1/34
CPCH02M1/34H02M1/0058H02M1/348Y02B70/10
Inventor 刘传洋刘景景孙佐
Owner CHIZHOU UNIV