Seven-level inverter

An inverter and seven-level technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve problems such as difficult control of capacitor voltage balance and increase in the number of switching devices
CN106301042AActive Publication Date: 2017-01-04深圳蓝信电气有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
深圳蓝信电气有限公司
Publication Date
2017-01-04

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Abstract

The present invention discloses a seven-level inverter, consisting of a direct current power supply, two switch capacitor banks and a full-bridge switch group, wherein each switch capacitor bank is composed of a switch capacitor, two power switch tubes and three uncontrollable diodes; and the full-bridge switch group is provided with a traditional full-bridge structure. The seven-level inverter disclosed by the invention has ten main switch states, can be used for outputting seven voltage levels namely 3E, 2E, E, 0, -E, -2E and -3E, is only provided with one direct current power supply, and can be used for boosting the input direct current power supply without using a transformer; and compared with a seven-level inverter with a traditional structure, the complexity of devices can be greatly reduced, the manufacturing cost can be effectively reduced, and the inverting efficiency can also be improved.
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Description

technical field

[0001] The invention relates to a seven-level inverter, which belongs to the field of power electronic power conversion. Background technique

[0002] Multilevel power conversion technology has always been a research hotspot in the field of power electronics technology. With the continuous development of science and technology and industry, in the solution to realize medium-high voltage and high-power conversion, multi-level inverters have low total harmonic distortion rate of output waveform, low switching frequency of power devices, and high output voltage inverter efficiency. It is widely used in high-voltage and large-capacity motor drives, medium and high-voltage AC speed regulation, new energy power generation, high-power reactive power compensation, and active power filtering.

[0003] At present, the main multi-level inverters include diode embedded multi-level inverters, flying capacitor embedded multi-level inverters and cascaded H-bridge multi-lev...

Claims

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