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Interleaved Boost converter comprising lossless buffer circuit

A technology of buffer circuit and converter, which is applied in the direction of adjusting electric variable, converting device of output power, converting DC power input to DC power output, etc. It can solve the problems of difficulty in implementing the control and driving circuit of the converter, and achieve the goal of circuit Simple topology and reduced turn-off loss

Active Publication Date: 2014-10-22
武汉欣远自控工程有限公司
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Problems solved by technology

However, the research objects of most of the current schemes are all applications using MOS tubes. The main focus is to reduce the turn-on loss of the switch tube rather than the turn-off loss. This is difficult to directly apply to high-power applications that mainly use IGBTs. , and most of the solutions contain active switching tubes, which makes it difficult to implement the control and drive circuits of the converter

Method used

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  • Interleaved Boost converter comprising lossless buffer circuit
  • Interleaved Boost converter comprising lossless buffer circuit

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Embodiment

[0018] Such as figure 1 As shown, a 2-phase interleaved parallel Boost converter with zero-voltage turn-off capability is composed of a 2-phase interleaved parallel basic Boost converter and a proposed lossless snubber circuit; Compared with the boost converter, it has zero-voltage turn-off capability, which can greatly reduce the loss caused by the current tail effect when the power switch tube is turned off. The DC-DC converter contains two power switches S 1 , S 2 , two output diodes D 1 、D 2 , an auxiliary capacitor C a1 , two auxiliary diodes D a1 、D a2 , two inductors L 1 , L 2 , an output filter capacitor C 0 ;

[0019] Inductance L 1 , L 2 The input terminal is connected to the positive pole of the input power supply, the output terminal is connected to the anode of the respective Boost unit diode and the collector of the power switch tube, and the diode D 1 、D 2 The cathode of the output filter capacitor C 0 One end of the node is the output V out posi...

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Abstract

An interleaved Boost converter comprising a lossless buffer circuit comprises inductors L1, L2...Ln. The input ends of the inductors L1, L2...Ln are connected with the positive electrode of an input power supply Vin. The output ends of the inductors L1, L2...Ln are connected with the anodes of diodes D1, D2...Dn. The output ends of the inductors L1, L2...Ln are connected with the collectors of power switching tubes S1, S2...Sn. The cathodes of the diodes D1, D2...Dn are connected with one end of a filter capacitor C0. The emitters of the power switching tubes S1, S2...Sn and the other end of the filter capacitor C0 are connected with the negative electrode of the input power supply Vin. The interleaved Boost converter can effectively reduce the switching-off loss of the power switching tubes, and has a simple structure. The performance of the original converter is not changed, the difficulty in control and drive circuit implementation is reduced, the cost is low, and no energy loss is caused.

Description

technical field [0001] The invention relates to an interleaved parallel Boost converter, in particular to an interleaved parallel Boost converter including a lossless buffer circuit. Background technique [0002] The circuit structure of a traditional basic Boost converter includes an inductor, a power switch tube, and an output diode. The input terminal of the inductor is connected to the positive pole of the input power supply, the output terminal is connected to the anode of the diode, and the cathode of the diode is connected to the positive pole of the output terminal of the converter; the drain of the power switch is connected between the anode of the inductor and the diode, and the source of the power switch is connected to the converter. negative electrode. When this basic Boost converter is used in high-power applications, the turn-off loss of the switch tube becomes very high due to the current tailing effect of the IGBT, and the turn-off loss also accounts for a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
Inventor 邾玢鑫杨玉良黄悦华谭超陈晨
Owner 武汉欣远自控工程有限公司
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