Three-phase three-level rectifier based on three-winding isolation transformer

An isolation transformer and three-level rectification technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as complex control, and achieve zero-crossing distortion and simple circuit structure. and control, the effect of lowering the output lower limit
CN112366962BActive Publication Date: 2021-11-09HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2021-11-09

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Abstract

A three-phase three-level rectifier based on a three-winding isolation transformer solves the problems of complex structure and control of the existing three-switch Sepic type three-phase three-level rectifier, and belongs to the field of three-level rectifier topology. The present invention is applied to aviation power supplies, including three input filter inductors a, three energy storage capacitors, three three-winding isolation transformers, three sets of bidirectional switches, six power diodes and two output filter capacitors; the present invention adopts a simple circuit The structure and control can achieve a better power factor correction effect function, effectively reducing the output lower limit of the output voltage, and the introduction of the three-winding isolation transformer can effectively reduce the voltage stress of the switching tube in the circuit. When the input current of the present invention crosses zero, there is no current reverse mutation problem; at the same time, when the input voltage crosses zero, the voltage at both ends of the energy storage capacitor is negative, even if the input voltage does not exceed the voltage of the energy storage capacitor, it will not affect the Charging of the input filter inductor.
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Description

technical field

[0001] The invention relates to a novel three-phase three-level rectifier based on a three-winding isolation transformer, belonging to the field of three-level rectifier topology. Background technique

[0002] Multilevel rectifiers show excellent application prospects due to their advantages such as less current harmonic content and lower voltage stress on switching devices. Among them, the VIENNA rectifier, as a relatively typical three-level topology, has a simple circuit structure and has been widely used in the field of high-voltage, high-power power factor correction.

[0003] In order to ensure the normal operation of the VIENNA rectifier, its output voltage is required to be greater than twice the maximum input voltage, so that the VIENNA rectifier can be used in occasions where the output voltage adjustment range is wide (such as aviation power supply with three-phase input of 115V / 400Hz and output of 270V constant voltage) Voltage level requirements...

Claims

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