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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, limit operating frequency, reduce circuit efficiency, etc., to improve power The effect of density, increasing operating frequency, and improving circuit efficiency

Active Publication Date: 2005-01-12
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

[0022] refer to figure 2 , the composite active clamping three-phase AC-DC power factor correction converter of the present invention comprises a three-phase bridge arm composed of six anti-parallel fully-controlled main switches S1-S6 with diodes connected to the power supply and each phase bridge respectively The input inductance LA~LC between the midpoints of the arms and the output capacitor Co connected to the output terminal 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, as shown in the figure. In the three-phase bridge arm, the positive bus bar of the three-phase bridge arm and the positive terminal of the output capacitor Co are connected to the resonant inductance Lr, and the circuit connected in series by the auxiliary switch S7 with a diode connected in antiparallel and the clamping capacitor Cc is connected across the two ends of the resonant inductan...

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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

technical field [0001] The invention relates to an AC-DC converter, especially a composite active clamp three-phase power factor correction converter. Background technique [0002] The current three-phase AC-DC power factor correction converter such as figure 1 As shown, it includes a three-phase bridge arm composed of six anti-parallel fully-controlled main switches S1~S6 with diodes, respectively connected to the input inductors LA~LC between the power supply and the midpoint of each phase bridge arm and connected to the three The output capacitor Co at the output of the phase 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 improved and there is a large electromagneti...

Claims

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Application Information

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