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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

Active Publication Date: 2017-01-04
深圳蓝信电气有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is necessary to achieve a higher voltage level and number of levels, the number of clamping diode devices or clamping capacitor devices required for the diode clamping multilevel inverter and the flying capacitor clamping multilevel inverter will increase sharply, and there is a problem that the capacitor voltage balance control is difficult
Although cascaded H-bridge multilevel inverters are relatively easy to achieve a larger number of levels and voltage levels, with the increase of voltage levels, the number of cascaded units of cascaded H-bridge multilevel inverters also decreases. will increase, and the number of switching devices will increase accordingly

Method used

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Embodiment Construction

[0033] A detailed description of alternative embodiments of the present invention is given below with reference to the accompanying drawings.

[0034] figure 1 Shown is a schematic structural diagram of the seven-level inverter of the present invention. The inverter is composed of a DC power supply, a full bridge switch group SW, a first switched capacitor group SC1 and a second switched capacitor group SC2.

[0035] The two switched capacitor groups of the inverter in this embodiment, that is, the first switched capacitor group SC1 and the second switched capacitor group SC2 have the same structure, and are composed of one switched capacitor, two power switch tubes and three uncontrollable diodes.

[0036] The first switched capacitor group SC1 of the inverter in this embodiment is composed of the first capacitor C1, the fifth switch tube S5, the sixth switch tube S6, the fifth diode D5, the sixth diode D6 and the ninth diode D9 constitutes. The anode of the ninth diode D9...

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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.

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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Application Information

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IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/5387
Inventor 叶满园肖云煌李宋
Owner 深圳蓝信电气有限公司
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