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Cascaded multilevel single-phase and three-phase inverters using triac networks

A switching network, multi-level technology, used in electrical components, output power conversion devices, and AC power input to DC power output, etc., can solve the problems of inductance loss and output harmonics.

Active Publication Date: 2018-02-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inductance losses and output harmonics are still large

Method used

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  • Cascaded multilevel single-phase and three-phase inverters using triac networks
  • Cascaded multilevel single-phase and three-phase inverters using triac networks
  • Cascaded multilevel single-phase and three-phase inverters using triac networks

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Embodiment Construction

[0029] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but it is not intended to determine the key or important part of the present invention, nor is it intended to limit the scope of the present invention. With reference to the following description of the embodiments of the present invention in conjunction with the accompanying drawings, it will be easier to understand the above and other purposes, features and advantages of the present invention. of.

[0030] see Figure 1A , a cascaded multi-level single-phase half-bridge inverter using a new three-terminal switch network, including: two input power supplies (V1, V2), four input filter capacitors (C1, C2, C3, C4) , four power switches (S1, S2, S3, S4) and their body diodes (D1, D2, D3, D4), two anti-phase coupled two-winding transformers (T1, T2), two filter inductors (L1 , L2) and an output filter capacitor C5, four power diodes (D5, ...

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Abstract

The invention discloses a cascaded multi-level single-phase half-bridge inverter using a three-terminal switch network, including four power switch tubes and their body diodes, four input filter capacitors, two reverse-coupled two-winding transformers, Two output filter inductors and a filter capacitor, four power diodes. The invention can be extended to single-phase full-bridge inverter and three-phase bridge inverter circuits with two structures. The present invention uses four power switch tubes, four power diodes, and two reverse-coupled transformers to form a cascaded connection of two three-terminal switch networks. Compared with general two-level or traditional multi-level inverter topologies, each There is no need to set a dead zone between the upper and lower bridge arm power switch tubes inside a three-terminal switch network, and they can be turned on at the same time to achieve multi-level output at the inverter midpoint, thereby improving output voltage harmonics and reducing output filtering. The size and volume of the inductor reduce the loss of the switching device, thereby reducing the system material cost and improving the system performance of the inverter.

Description

technical field [0001] The invention relates to a multi-level inverter, specifically a cascaded multi-level single-phase inverter and a three-phase inverter using a three-terminal switch network. Background technique [0002] Inverters convert direct current to alternating current. Inverters are an important part of uninterruptible power supplies (UPS) and new energy power generation systems such as wind energy, solar photovoltaic, and fuel cells. Conversion efficiency and output harmonics are the most important electrical indicators of the inverter. High conversion efficiency can reduce power loss, and low harmonics can improve power quality. [0003] The loss of power devices and output filter inductors in the inverter limits the improvement of inverter efficiency. At the same time, fierce market competition, rising prices of raw materials such as power switch tubes and steel and copper have brought great cost pressure to inverter manufacturers. At present, due to the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 胡炎申谢运祥
Owner SOUTH CHINA UNIV OF TECH