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Five-level inverter topology unit and five-level inverter

An inverter and five-level technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problems of low current conversion accuracy, increased cost, and bulky volume, etc., to achieve The effect of small loss, low cost and small volume

Active Publication Date: 2015-02-18
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in this application is to provide a five-level inverter topology unit and a five-level inverter, which are used to solve the problem of the large size of the inverter system in the prior art, increased cost, more losses, and lower efficiency. Technical problems of low and low current conversion accuracy

Method used

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  • Five-level inverter topology unit and five-level inverter
  • Five-level inverter topology unit and five-level inverter
  • Five-level inverter topology unit and five-level inverter

Examples

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Embodiment 1

[0080] refer to figure 2 , the topology diagram of Embodiment 1 of a five-level inverter topology unit provided by the present invention, a five-level inverter topology unit, including a switch tube T1, a switch tube T2, a switch tube T3, a switch tube T4, and a switch tube TA1, switch tube TB1, diode DF1 and diode DF2;

[0081] Each of the switching tubes is connected in antiparallel with a diode;

[0082] The first DC input terminal M1 of the topology unit is connected to the second DC input terminal M2 of the topology unit through sequentially series-connected diode DF1, switch tube T2, switch tube T3 and diode DF2;

[0083] The third DC input terminal M3 of the topology unit is connected to the connection line between the diode DF1 and the switch tube T2 through the switch tube T1;

[0084] The connection line between the switch tube T3 and the diode DF2 is connected to the fourth DC input terminal M4 of the topology unit through the switch tube T4;

[0085] The fifth ...

Embodiment 2

[0089] refer to image 3 , which shows a schematic structural diagram of Embodiment 2 of a five-level inverter provided by the present invention. Based on the above-mentioned embodiment, the present invention provides a five-level inverter, including a power boost circuit 101, a filter The grid-connected circuit 103 and the inverter topology unit 102 as in the first embodiment above, wherein:

[0090] The first DC positive level PV1+ of the power boost circuit 101 is connected to the first DC input terminal M1 of the inverter topology unit 102, and the second DC positive level PV2+ of the power boost circuit 101 is connected to the The third DC input terminal M3 of the inverter topology unit 102 is connected, the DC zero-level PV0 of the power boost circuit 101 is connected to the fifth DC input terminal M5 of the inverter topology unit 102, and the power boost circuit 101 The first DC negative level PV1-connected to the second DC input terminal M2 of the inverter topology un...

Embodiment 3

[0160] refer to Figure 19 , which shows an equivalent diagram of Embodiment 1 of the five-level inverter topology unit provided by the present application. In the equivalent diagram, the first AC output terminal of Embodiment 1 of the five-level inverter topology unit is defined as the AC output terminal of the topology unit.

[0161] refer to Figure 20 , which shows a topological diagram of Embodiment 3 of a five-level inverter provided by the present application, which is different from Embodiment 1 and Embodiment 2 of the present application, the power boost circuit and the embodiment of the third embodiment of the present application The structure and function of the power boosting circuit in the second embodiment are the same, except that, the structure and working mode of each inverter topology unit in the five-level inverter provided in the third embodiment are also the same as those in the second embodiment above The inverter topology unit is the same, and will not...

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Abstract

The application provides a five-level inverter topology unit. The five-level inverter topology unit comprises size switch tubes in inverse-parallel connection with a diode, and two diodes. In the prior art, voltage sharing measures and a large RC (resistor-capacitor) absorption circuit are required to prevent the problems of large size, high cost, large loss and low efficiency of the inverter caused by overvoltage on both ends of a portion of the diodes. The five-level inverter topology unit provided by application can provide a current passage and simultaneously ensure less number of semiconductor devices, smaller size, lower cost, smaller loss and higher efficiency of the entire inverter when realizing single-phase and multi-phase application.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a five-level inverter and its application circuit. Background technique [0002] For medium-voltage and large-capacity applications, multi-level inverters are widely used. The current five-level inverters are mainly diode-clamped. The diode-clamped five-level inverter is introduced below. [0003] see figure 1 , which is a topology diagram of a diode-clamped five-level inverter provided in the prior art. [0004] figure 1 Shown is the topology of a half-bridge five-level inverter. Diodes are used for voltage clamping for each switching tube. For example, the first diode DB1 is used to clamp the potential of the lower end of the switching tube T1 to the lower end of the first capacitor C1; the second diode DB2 is used to clamp the potential of the lower end of the switching tube T5 to the lower end of the first capacitor C1. The other diodes DB3, DB4, DB5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
Inventor 汪洪亮赵为宋炀
Owner SUNGROW POWER SUPPLY CO LTD
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