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T-shaped multi-level inversion circuit

A multi-level inverter, multi-level technology, applied in high-efficiency power electronic conversion, electrical components, conversion of AC power input to DC power output, etc., can solve problems such as increased cost of multi-level inverters, and achieve savings Quantity, switching frequency reduction, the effect of saving production cost

Inactive Publication Date: 2017-04-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • T-shaped multi-level inversion circuit
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Embodiment Construction

[0022] 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.

[0023] A kind of T type multi-level inverter circuit of the present invention such as figure 1 As shown, it includes: a T-type three-level circuit 1, a switch tube 2, a T-type three-level circuit 3, a pair of anti-series switch tubes 4, and a filter circuit 5. The input power supply in the T-type three-level circuit is composed of two equivalent voltage sources connected in series, that is, the negative pole of one voltage source is connected to the positive pole of the other voltage source; the inverter bridge arm composed of two switching...

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Abstract

The invention discloses a T-shaped multi-level inversion circuit, and the circuit comprises two T-shaped three-level circuits, two switching tubes, two pairs of reverse parallel switching tubes, and an LC filter circuit. The input power heteropolarity ends of the two T-shaped three-level circuits are connected through the two switching tubes, and the two pairs of reverse parallel switching tubes enables the homopolarity input power ends of the two T-shaped three-level circuits to be connected. The LC filter circuit is connected to central nodes of inversion bridge arms of the two T-shaped three-level circuits, and the ratio of the input power voltages of the two T-shaped three-level circuits is 5. The circuit generates more levels through fewer switching tubes, greatly reduces the number of power switching tubes, further reduces the cost of a multi-level inverter, improves the efficiency of the inverter, and reduces the switching frequency.

Description

technical field [0001] The invention relates to a T-shaped multilevel inverter 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): H02M7/483
CPCH02M7/483H02M1/0054Y02B70/10
Inventor 温海涛马运东孙明波陈肖逸朱爱云
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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