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Non-isolation type AC-AC tri-level converter

A non-isolated, converter technology that can be used in conversion equipment, electrical components, and output power conversion devices that can be converted to DC without intermediate conversion, and can solve problems such as single topology.

Inactive Publication Date: 2007-09-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The converter has simple topology, single-stage power conversion (LFAC-LFAC), bidirectional power flow, high power factor on the input side, good spectral characteristics of the output filter front-end voltage, high conversion efficiency and power density, simple control, and is suitable for high voltage Large-capacity AC-AC conversion and other advantages, but there are defects such as single topology and can only realize step-down conversion

Method used

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  • Non-isolation type AC-AC tri-level converter
  • Non-isolation type AC-AC tri-level converter
  • Non-isolation type AC-AC tri-level converter

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Embodiment Construction

[0020] In conjunction with Figure 1, the circuit structure of the non-isolated AC-AC three-level AC-AC converter of the present invention consists of an input high-voltage AC power supply, an input filter, a multi-level converter, an output filter, and an output AC load. . The circuit structure can directly convert unstable high-voltage and low-quality alternating current into stable (or adjustable) same-frequency and high-quality sinusoidal alternating current. Input high voltage AC power u i with input filter inductor L i One end of the connection, the input filter inductor L i The other end of the multilevel converter and the input filter capacitor C i connected, the input filter capacitor C i The other end of the input high-voltage AC power supply u i , Multi-level converters are connected; input filter inductance L i and input filter capacitor C i Constitutes an input filter, which can input high-voltage AC power u i Filtering; the multilevel converter is composed...

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Abstract

The present invention discloses a non-isolated AC-AC three-level AC-AC converter which has a structure comprising an input filter, a multilevel converter and an output filter connected in turn. Wherein the multilevel converter is composed of a basic constitution unit of two capacitors clamping, an energy-storage inductor and an energy-storage capicitor which are constitued for converting the input voltage to three output levels; the basic constitution unit is composed of a four quadrants power switch and a clamping capicitor. By different combinations with the input filter, basic constitution unit and output filter, a circuit topology family for non-isolated AC-AC three-level AC-AC converter including Boost type, Buck-Boost type, Cuk type, Sepic type and Zeta type. The invention with improved converting effiency, power density, reduced volume and weight as well as input side power factor is fit for high voltage AC-AC electric power converting, due to the reduced volume and weight of the output filter and improved output waveform quality, the application fields of three-level AC-AC converter can be widened.

Description

technical field [0001] The invention belongs to power electronic conversion technology, in particular to a non-isolated AC-AC three-level AC-AC converter. Background technique [0002] AC-AC conversion technology is a conversion technology that uses power semiconductor devices to convert AC power of a certain frequency and amplitude into AC power of the same or another frequency and amplitude. It is widely used in national defense, industrial and mining enterprises, Research institutes, university laboratories and daily life. [0003] So far, research on AC-AC converters by power electronics researchers at home and abroad has mainly focused on two-level AC-AC converters such as non-electrical isolation, low-frequency and high-frequency electrical isolation; for multi-level converters The research mainly focuses on multilevel DC converters, multilevel inverters and multilevel rectifiers, while the research on multilevel AC-AC converters is very little, and is only limited to...

Claims

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Application Information

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IPC IPC(8): H02M5/06H02M1/12
Inventor 李磊
Owner NANJING UNIV OF SCI & TECH
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