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A nine-level converter

A converter, a nine-level technology, applied in the field of nine-level converters, can solve the problems of a large number of switches, high system cost, and difficult control of capacitor voltage in a mid-point clamp converter, and achieves a small number of manufactured devices, Cost reduction and stable performance

Active Publication Date: 2022-04-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional multilevel topology converters are divided into flying capacitor converters, midpoint clamped converters, and cascaded H-bridge converters according to the topology of the main circuit. Among them, the flying capacitor converter has a large number of capacitors. The capacitor voltage is difficult to control; the traditional midpoint clamped converter has a large number of switches; the cascaded H-bridge converter requires multiple independent DC power supplies, resulting in higher system costs

Method used

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  • A nine-level converter
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  • A nine-level converter

Examples

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Embodiment 1

[0048] Such as figure 1 As shown, a nine-level converter provided in this embodiment at least includes a series capacitor group and a series bidirectional switch group arranged between the positive and negative DC bus bars, as well as a switched capacitor unit and a filter circuit;

[0049] One side of the switched capacitor unit is respectively connected to the connection points of adjacent capacitors in the series capacitor group, and the other side of the switched capacitor unit is connected to the first and last connection point of the connection points of the adjacent bidirectional switches in the series connected bidirectional switch group respectively connected; the intermediate connection point of the series capacitor group is connected to the ground; the intermediate connection point of the bidirectional switch group is connected to the filter circuit;

[0050]The filter circuit includes an energy storage inductor and a filter capacitor, one end of the energy storage ...

Embodiment 2

[0085] Such as Figure 12 As shown, the intermediate positive level control module includes a seventh bidirectional switch and an eighth bidirectional switch connected in series; one end of the seventh bidirectional switch is connected to the connection point between the first capacitor C1 and the second capacitor C2; The other end is connected to one end of the eighth bidirectional switch, and the other end of the eighth bidirectional switch is connected to the connection point between the first switching tube S1 and the second switching tube S2;

[0086] The intermediate negative level control module includes a ninth bidirectional switch and a tenth bidirectional switch connected in series; one end of the ninth bidirectional switch is connected to the connection point between the third capacitor C3 and the fourth capacitor C4; the other end is connected to the third capacitor C3 and the fourth capacitor C4; One end of the tenth bidirectional switch is connected, and the othe...

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Abstract

The invention discloses a nine-level converter, which comprises a series capacitor group, a series bidirectional switch group, a switch capacitor unit and a filter circuit; one side of the switch capacitor unit is respectively connected to the connection points of adjacent capacitors in the series capacitor group, The other side of the switched capacitor unit is respectively connected to the first and last connection points among the connection points of the adjacent bidirectional switches in the series bidirectional switch group; the middle connection point of the series capacitor group is connected to the ground; the bidirectional switch group The middle connection point of the capacitor is connected to the filter circuit; one end of the series capacitor group is connected to one end of the series bidirectional switch group; the other end of the series capacitor group is connected to the other end of the series bidirectional switch group. The nine-level converter provided by the present invention can generate a nine-level output voltage through a switched capacitor unit. The circuit structure requires a small number of manufacturing components, a simple structure and high reliability.

Description

technical field [0001] The invention relates to the technical field related to power electronic conversion, in particular to a nine-level converter. Background technique [0002] Multi-level converter technology is a technology to achieve capacity expansion by changing the topology of the converter. Compared with two-level and three-level converters, multi-level converters can reduce the output harmonics on the AC side, reduce the voltage stress of switch tubes, and reduce the size of passive filters. The electrical energy conversion provides an effective solution. [0003] Traditional multilevel topology converters are divided into flying capacitor converters, midpoint clamped converters, and cascaded H-bridge converters according to the topology of the main circuit. Among them, the flying capacitor converter has a large number of capacitors. The capacitor voltage is difficult to control; the traditional mid-point clamped converter has a large number of switches; the casc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 吴军科熊攀刘阳升范兴明
Owner GUILIN UNIV OF ELECTRONIC TECH