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Single-phase three-level inverter

A three-level inverter and single-phase technology, applied in the direction of electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the inconvenience of system installation, system efficiency reduction, complex system structure, etc. problem, to achieve the effect of good power quality, simple control method, and elimination of common mode current

Active Publication Date: 2013-07-10
HOYMILES POWER ELECTRONICS INC
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AI Technical Summary

Problems solved by technology

Inverters with power frequency transformers or high frequency transformers can realize the functions of boosting and isolation. However, inverters with power frequency transformers are bulky, heavy, expensive, and inconvenient for system installation; Although the size and weight of the type inverter are greatly reduced, this type of inverter system is often composed of multiple stages, resulting in a complex system structure and reduced system efficiency.

Method used

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  • Single-phase three-level inverter
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  • Single-phase three-level inverter

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Embodiment Construction

[0024] See attached figure 1 , a single-phase three-level inverter of the present invention, including an input capacitor C dc , the first power switch S 1 , the second power switch S 2 , the third power switch S 3 , the fourth power switch S 4 , the fifth power switch S 5 , the sixth power switch S 6 , the first freewheeling diode D 7 , the second freewheeling diode D 8 and filter F;

[0025] The first power switch S described in this embodiment 1 by the first switching transistor T 1 and the first antiparallel diode D 1 Composed in parallel, the second power switch S 2 by the second switching transistor T 2 and the second antiparallel diode D 2 Composed in parallel, the third power switch S 3 by the third switching transistor T 3 and the third antiparallel diode D 3 Composed in parallel, the fourth power switch S 4 by the fourth switching transistor T 4 and the fourth antiparallel diode D 4 Composed in parallel, the fifth power switch S 5 by the fifth swi...

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Abstract

A single-phase three-level inverter includes an input capacitor (Cdc), six power switches (S1, S2, S3, S4, S5, S6), two free-wheeling diodes (D7, D8) and a single-phase output filter (F). The switching operation is performed by the cooperation of the six power switches and the free-wheeling diodes, so that when the output voltage from the inverter is zero level, the output AC side and the input DC side of the inverter are in a decoupled state, which insures that the common-mode voltage is maintained at a constant while the output voltage from the inverter is performed with three levels, so as to completely eliminate the common-mode current.

Description

technical field [0001] The invention relates to an inverter in the field of DC-AC converters of power electronics technology, in particular to a single-phase three-level transformerless inverter. Background technique [0002] As the world's energy shortage and environmental pollution become increasingly serious, energy and the environment have become one of the most important issues facing mankind in the 21st century. The development and application of clean and renewable energy has attracted more and more attention from countries all over the world. . A large number of renewable energy sources are direct current, which needs to be converted into industrial frequency alternating current through an inverter before it can be used in large quantities. Therefore, inverter technology plays a vital role in the development and utilization of renewable energy. [0003] Inverter refers to a power electronic converter that converts DC power into AC power by turning on and off semico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395
CPCH02M7/483H02M2001/123H02M7/487H02M1/123H02M1/0095
Inventor 杨波何湘宁崔文峰梅烨
Owner HOYMILES POWER ELECTRONICS INC
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