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Multi-level inverter circuit and control method thereof

A multi-level inverter and inverter technology, applied in the field of circuits, can solve problems such as no discharge technical solutions, and achieve the effect of low cost and simple operation

Active Publication Date: 2015-12-30
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the inverter circuit stops working, it is also necessary to discharge the floating capacitor to prevent the relevant staff from getting an electric shock and ensure safety, but there is no corresponding discharge technical solution in the prior art

Method used

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  • Multi-level inverter circuit and control method thereof
  • Multi-level inverter circuit and control method thereof
  • Multi-level inverter circuit and control method thereof

Examples

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Embodiment 1

[0055] figure 2 It is a schematic structural diagram of an inverter circuit provided by Embodiment 1 of the present invention, and this embodiment is applicable to the case of discharging the floating capacitance in a multilevel inverter. Such as figure 2 As shown, the multilevel inverter circuit includes a primary capacitor inverter unit 110, cascaded m level switching units 120 and a first discharge circuit 130;

[0056] The input terminal of the primary capacitor inverter unit 110 is connected to the DC power supply. Those skilled in the art can understand that this may include the situation where the primary capacitor inverter unit 110 is directly connected to the battery board, or it may be the case where the battery board and the primary capacitor inverter A booster circuit is provided between the units 110 .

[0057] The level switching unit 120 includes a first capacitor, a first switch tube and a second switch tube, wherein the first end of the first capacitor is ...

Embodiment 2

[0065] On the basis of the above embodiments, this embodiment, as a preferred embodiment, specifically provides the discharge circuit diagram when the first discharge circuit is connected between two adjacent level switching units, specifically including two Condition. In the first case, the first connection end of the first discharge circuit is electrically connected to the first end of the first capacitor in the i-th level switching unit, and the second connection end of the first discharge circuit is electrically connected to the i+1th level switching unit. The second end of the first capacitor in the level switching unit is electrically connected. Wherein i is a positive integer, and i+1 is less than or equal to m.

[0066] image 3Schematic structure diagram of an inverter circuit provided for Embodiment 2 of the present invention Figure 1 , for the convenience of representation, in this embodiment, the case where i is equal to 1 is used for specific description, such...

Embodiment 3

[0075] On the basis of the above embodiments, this embodiment is taken as a preferred embodiment, and specifically provides that when the first discharge circuit 130 is connected to a discharge line between non-adjacent two-stage level switching units.

[0076] If the first connection end of the first discharge circuit 130 is electrically connected to the first end of the first capacitor in the i-th level switching unit, the second connection end of the first discharge circuit 130 is electrically connected to the first end of the j-th level switching unit. The second end of a capacitor is electrically connected, and when the first capacitor in the i-th level switching unit is discharged, the second end of the first capacitor in the i-th level switching unit is controlled to switch to the j-th level The switch tube between the second ends of the first capacitor in the unit is turned on, and the first discharge circuit 130 is turned on; when the first capacitor in the j level swi...

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Abstract

The invention discloses a multi-level inverter circuit and a control method thereof. The multi-level inverter circuit comprises a primary capacitance inverter unit, m cascaded level switching units and a first discharging circuit. The input end of the primary capacitance inverter unit is connected with a direct current power source. Each level switching unit comprises a first capacitor, a first switch tube and a second switch tube, wherein the first end of the first capacitor is electrically connected with the first end of the first switch tube, and the second end of the first capacitor is electrically connected with the second end of the first switch tube. The first discharging circuit is used for discharging the first capacitors of the m cascaded level switching units and comprises a first connecting end and a second connecting end. According to the multi-level inverter circuit, a main circuit unit of an inverter is reused by adding the simple first discharging circuit among the level switching units, discharging of a flying capacitor can be achieved by controlling actions of the first discharging circuit and the corresponding switch tubes, the cost is low, and operation is simple and reliable.

Description

technical field [0001] The embodiment of the present invention relates to circuit technology, in particular to a multi-level inverter circuit and a control method thereof. Background technique [0002] At present, multi-level inverters have been widely used in medium-voltage and large-capacity applications. The main reason is that the topology of multi-level inverters has the advantages of small output harmonics, fast dynamic response, wide transmission frequency bandwidth, and good electromagnetic compatibility. . [0003] figure 1 It is a structural schematic diagram of a multi-level inverter circuit in the prior art, such as figure 1 As shown, the multilevel inverter circuit includes a primary capacitor inverter unit 110, and cascaded m level switching units 120, where m is an integer greater than or equal to 1, wherein the input of the primary capacitor inverter unit 110 The terminal is connected to the DC power supply, the primary capacitor inverter unit 110 can conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
Inventor 耿后来申潭别伟王鹏李浩源
Owner SUNGROW POWER SUPPLY CO LTD
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