Composite active clamped 3-phase A.C-D.C power factor correction transformer

A composite active clamp, three-phase AC technology, applied in the field of composite active clamp three-phase power factor correction converters, can solve the problems of large switching loss of devices, reduce circuit efficiency, limit operating frequency, etc., to improve power Density, improve circuit efficiency, increase the effect of operating frequency

Active Publication Date: 2007-09-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This three-phase AC-DC power factor correction converter can realize input current power factor correction, but the circuit works in a hard switching state, there is a problem of reverse recovery of the diode, and the switching loss of the device is large, which limits the increase of the operating frequency and reduces the The circuit efficiency is improved and there is a large electromagnetic interference

Method used

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  • Composite active clamped 3-phase A.C-D.C power factor correction transformer
  • Composite active clamped 3-phase A.C-D.C power factor correction transformer
  • Composite active clamped 3-phase A.C-D.C power factor correction transformer

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Embodiment Construction

[0023] Referring to Fig. 2, the composite active clamp three-phase AC-DC power factor correction converter of the present invention comprises three-phase bridge arms composed of six anti-parallel fully-controlled main switches S1-S6 with diodes, respectively connected to the power supply and The input inductance LA~LC between the midpoints of each phase bridge arm and the output capacitance Co connected to the output end of the three-phase bridge arm are characterized in that the six main switches S1-S6 of the three-phase bridge arm are connected in parallel with capacitors C1-C6 respectively, as shown in Fig. In the specific example shown, the positive busbar of the three-phase bridge arm and the positive end of the output capacitor Co are connected to the resonant inductance Lr, and the auxiliary switch S7 with a diode connected in antiparallel is connected in series with the clamping capacitor Cc across the two ends of the resonant inductance Lr In the circuit, a capacitor C...

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Abstract

The converter includes six pieces of three phase bridge arm including full controlled main switch with diode connected in inverted parallel, input inductance connected between power source and middle point of each phase bridge arm, and output capacitance connected to output end of three phase bridge arm. Characters are that capacitance is connected to six main switches respectively. Resonant inductance is connected to DC bus of three-phase bridge arm and output capacitance. Cascaded circuit of auxiliary switch and clamping capacitance is cross-connected on two ends of resonant inductance. Two ends of the auxiliary switch are connected to diode in inverted parallel as well as connected to capacitance. Features of the converter are simple structure, restraining backward recovery of diode connected in inverted parallel, realization of soft switch and high efficiency of circuit.

Description

[0001] technology field or [0002] The invention relates to an AC-DC converter, especially a composite active clamp three-phase power factor correction converter. Background technique [0003] The current three-phase AC-DC power factor correction converter is shown in Figure 1. It includes a three-phase bridge arm composed of six fully-controlled main switches S1~S6 connected in antiparallel with diodes, which are respectively connected to the power supply and each phase bridge. The input inductors LA~LC between the midpoints of the arms and the output capacitor Co connected to the output end of the three-phase bridge arm. This three-phase AC-DC power factor correction converter can realize input current power factor correction, but the circuit works in a hard switching state, there is a problem of reverse recovery of the diode, and the switching loss of the device is large, which limits the increase of the operating frequency and reduces the The circuit efficiency is improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M1/14H02M1/42
CPCY02B70/1491Y02B70/126Y02B70/10Y02P80/10
Inventor 徐德鸿冯波徐君
Owner ZHEJIANG UNIV
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