Four-level inversion topological unit and four-level inverter

A four-level inverter technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of a large number of semiconductor devices, an increase in the number of semiconductor devices, and inverters. The difficulty of packaging application circuits, increasing the cost of inverters and their reference circuits, etc.

Active Publication Date: 2012-11-07
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in this application is to provide a four-level inverter topology unit and a four-level inverter to solve the problem that the number of semiconductor devices in the existing four-level inverter is large, thereby increasing the T

Method used

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  • Four-level inversion topological unit and four-level inverter
  • Four-level inversion topological unit and four-level inverter
  • Four-level inversion topological unit and four-level inverter

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Embodiment Construction

[0090] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0091] refer to image 3 , which shows the topological diagram of Embodiment 1 of a four-level inverter topology unit provided by the present application, the four-level inverter topology unit includes a first branch, a second branch, a switch tube T1, a switch tube T4;

[0092] Each switch tube is connected in antiparallel with a diode;

[0093] The first DC input terminal M1 of the topology unit is connected to the second DC input terminal M2 of the topology unit through a first...

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Abstract

The invention provides a four-level inversion topological unit. The four-level inversion topological unit comprises four switching tubes which are connected in parallel with diodes in reverse direction and two diodes. According to the conventional four-level inverter, due to a large number of semiconductor devices, the cost of the inverter and the cost of an application circuit of the inverter are improved, and the packaging difficulty of the inverter and the packaging difficulty of the application circuit of the inverter are improved. The four-level inversion topological unit provided by the invention has the advantages that when single-phase application and multi-phase application are realized, direct current is inverted into alternating current, the quantity of the semiconductor devices of the whole inverter is decreased, the four-level inversion topological unit is small in size and low in cost, and the packaging difficulty of the application circuit of the inverter is reduced.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a four-level inverter topology unit and a four-level inverter. Background technique [0002] An inverter is a device that converts direct current into alternating current. With the continuous development and progress of technology and the continuous improvement of people's living standards, inverters have also become an important equipment for people to go out and emergency. Most of the current inverters are diode-clamped inverters or flying capacitor inverters. [0003] figure 1 and figure 2 Partial structures of conventional four-level inverters are shown respectively. in, figure 1 It is a partial structure of a diode-clamped four-level inverter, figure 2 It is a partial structure of the flying capacitor type four-level inverter. exist figure 1 In the inverter structure shown, four electrical signals with different potentials are generated through ...

Claims

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Application Information

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IPC IPC(8): H02M7/515
Inventor 汪洪亮赵为
Owner SUNGROW POWER SUPPLY CO LTD
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