9-level inversion topology circuit

A topology circuit, nine-level technology, applied in electrical components, irreversible DC power input into AC power output, AC power input into DC power output and other directions, can solve the cost increase of multi-level inverters, etc. problem, to achieve the effect of improving inverter efficiency, improving working efficiency, reducing conduction loss and switching loss

Inactive Publication Date: 2017-04-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

However, multi-level inverters also have some unavoidable shortcomings. In order to generate more multi-level inverters, more power switching devices need to be used, which also leads to an increase in the cost of multi-level inverters, which also becomes a constraint The main factor for the development of multi-level inverters; therefore, scholars have proposed various multi-level inverter circuit topologies in the past few years, hoping to use fewer switch tubes to generate more levels

Method used

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Embodiment Construction

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0020] Such as figure 1 Shown is the schematic diagram of the nine-level inverter topology circuit of the present invention, including: T-type three-level circuit 1, switch tube 2, T-type three-level circuit 3, LC filter circuit 4; T-type three-level circuit The input power supply is composed of two equivalent voltage sources connected in series, that is, the positive pole of one voltage source is connected to the negative pole of the other voltage source, and the inverter bridge arm composed of two switching tubes connected in series is co...

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Abstract

The invention discloses a 9-level inversion topology circuit comprising two T-type 3-level circuits, two switch tubes, and a LC filter circuit; input power supply heteropolar ends of the two T-type 3-level circuits are connected through the two switch tubes; the LC filter circuit is connected on an inversion bridge arm center node of the two T-type 3-level circuits; the input power supply-voltage ratio of the two T-type 3-level circuits is 1. Compared with a conventional multi-level inversion circuit, more levels are formed under unit switch tube of the 9-level inversion topology circuit, i.e., less switch tubes can form more levels, thus easily forming multi-level sine pulse-width modulation waveform simulation AC output, greatly reducing output harmonic wave content, reducing the output filter volume, greatly reducing inverter manufacture cost and material waste, and improving the inverter efficiency.

Description

technical field [0001] The invention relates to a nine-level inverter topology circuit, which belongs to the technical field of power electronic inverters. Background technique [0002] Inverter is an essential power conversion unit in industrialized society, and multilevel inverter has always been an extremely important power electronic device, which has been deeply researched and widely used. Multilevel inverter has many advantages such as low output harmonic content, high number of output levels, low voltage or current stress of devices, high efficiency, modularization, and good compatibility, making it widely used in photovoltaic power generation, wind power generation, and Source filtering, electric vehicles and other fields have been widely used, and it has significant advantages over two-level inverters in medium and high voltage power inverter applications. However, multi-level inverters also have some unavoidable shortcomings. In order to generate more multi-level ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/49H02M7/5387
CPCH02M7/49H02M7/5387H02M1/0067
Inventor 温海涛丁立伟朱爱云孙明波杜幼芝
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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