Single-phase inverter and system thereof and three-phase inverter and system thereof

A single-phase inverter and single-phase inverter technology, which is applied in the direction of converting irreversible DC power input to AC power output, and can solve the problems of many power switching devices, large tube voltage drop, and low efficiency.

Inactive Publication Date: 2013-10-23
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional 2-level topology inverter has a large tube voltage drop after the power switching device is turned on, and the on-state loss and switching loss are very large, resulting in a large total loss of the power switching device, thereby reducing the efficiency of the entire system
[0005] Neutral point clamped (NPC) topology has a large total loss and low efficiency due to the large number of power switching devices and the addition of clamping diodes

Method used

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  • Single-phase inverter and system thereof and three-phase inverter and system thereof
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  • Single-phase inverter and system thereof and three-phase inverter and system thereof

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Embodiment Construction

[0022] Embodiments of the present invention will be described below with reference to the drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that representation and description of components and processes that are not related to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions for the purpose of clarity.

[0023] First refer to Figure 1A and 1B A single-phase inverter 100 based on a three-level T-type topology according to an embodiment of the present invention will be described.

[0024] Such as Figure 1A As shown, the single-phase inverter 100 includes two three-level T-topologies connected in parallel at both ends of the DC source Udc, namely a first three-level T-topology T101 and a second three-level T-topology T101'. Specifically, the first...

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Abstract

The invention relates to a single-phase inverter and system thereof and a three-phase inverter and system thereof. The single-phase inverter comprises a first single-phase inverter circuit, a second single-phase inverter circuit, a drive circuit, a first coupling inductor and a second coupling inductor. The first single-phase inverter circuit and the second single-phase inverter circuit are configured to be connected in parallel with two ends of a DC source and are identical in structure. The drive circuit is configured in a way that the first single-phase inverter circuit is driven by a first drive signal, and the second single-phase inverter circuit is driven by a second drive signal, wherein the first drive signal is formed by modulating a first modulated wave and a first carrier wave, the second drive signal is formed by modulating a second modulated wave and a second carrier wave, and the phase of the first modulated wave is identical to the phase of the second modulated wave. The input end of the first coupling inductor receives the current outputted by the first single-phase inverter circuit, and the input end of the second coupling inductor receives the current outputted by the second single-phase inverter circuit. Besides, the first coupling inductor and the second coupling inductor are reversely coupled with each other, and the output end of the first coupling inductor and the output end of the second coupling inductor are connected with each other.

Description

technical field [0001] The invention relates to an inverter, in particular to a single-phase inverter and its system, a three-phase inverter and its system. Background technique [0002] The inverter plays the role of converting direct current into alternating current. Inverters are an important part of power generation systems. Efficiency is one of the most important performance indicators of an inverter. If the efficiency is improved, it can bring considerable economic benefits. [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 and rising prices of raw materials such as steel and copper have brought great cost pressure to inverter manufacturers. At present, due to the limitation of the performance of power devices, it is difficult to reduce the loss of power devices and filter inductors in traditional inverter topologies. In addition, the filter indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/46
Inventor 郑大鹏马志军靳广超魏卓张普雷
Owner EMERSON NETWORK POWER CO LTD
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