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High-reliability five-level three-phase dual-input inverter

A reliable, dual-input technology, applied in the direction of irreversible DC power input conversion to AC power output, electrical components, output power conversion devices, etc., can solve complex control methods, DC power supply short circuit, multi-level inverter Complicated circuits and other issues

Active Publication Date: 2017-05-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will lead to the deterioration of the inverter output waveform quality, and when the inverter is disturbed, the two switch tubes are still in danger of being turned on at the same time, resulting in a short circuit of the DC power supply
[0004] On the other hand, in high-voltage and high-power inverter applications, multi-level inverter technology has received more and more attention. People have proposed different circuit topologies and control strategies, but multi-level inverters still have circuit The disadvantages of complex and complex control methods affect the reliability of the inverter system

Method used

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  • High-reliability five-level three-phase dual-input inverter
  • High-reliability five-level three-phase dual-input inverter
  • High-reliability five-level three-phase dual-input inverter

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Embodiment

[0047] like figure 1 a shows a three-phase dual-input inverter circuit structure 4 without bridge arm shoot-through risk, including: two independent DC input voltage sources (V in1 ~V in2 ), twelve switching tubes (S 1 ~S 12 ), twelve diodes (D 1 ~D 12 ), six filter inductors (L 1 ~ L 6 ) and load.

[0048] The connection mode of the input power supply of the three-phase inverter is: V in1 The positive terminal of is connected to S 1 , S 5 , S 9 collector and D 4 、D 8 、D 12 negative pole; V in1 The negative terminal of the V in2 negative electrode, S 4 The emitter, S 8 The emitter, S 12 the emitter and D 1 positive electrode, D 5 positive electrode, D 9 positive pole.

[0049] V in2 The anode of the six diodes (D 2 、D 3 、D 6 、D 7 、D 10 、D 11 ), six switching tubes (S 2 , S 3 , S 6 , S 7 , S 10 , S 11 ) into the circuit; D 2 The positive terminal is connected to V in2 positive pole, D 2 The negative pole of is connected to S 2 collector; ...

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Abstract

The invention discloses a high-reliability five-level three-phase dual-input inverter. One kind of three-phase dual-input inverter is composed of two independent input sources, twelve switch tubes, twelve diodes and six filtering inductors. The other kind of three-phase dual-input inverter is composed of two independent input sources, twelve switch tubes, eight diodes and six filtering inductors. When the inverter of the invention is in any mode, one of an upper arm and a lower arm is in reverse series connection with one of the diodes in the topology, and shoot-through can be avoided structurally, and reliability is high; multi-level output is realized by means of combination and conversion of the two input power sources and the switches; the voltages Vin1 and Vin2 of the two input sources of the system are different, so that power can be supplied for the inverter in a time-division manner through control; and if the voltages Vin1 and Vin2 are obtained through boosting, one part of the output power of the system comes from Vin1, the other part of the output power of the system comes from a boosting unit, and therefore, single-stage conversion of part of the power can be realized, and the capacity of the boosting unit can be decreased, and the efficiency of the system can be improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to the technical field of DC-AC conversion, and specifically refers to a three-phase double-input inverter without the risk of bridge arm through-through. Background technique [0002] With the rapid development of aviation power supply, new energy power generation, electric vehicles and other technologies, high reliability and high efficiency inverter inverter technology has received extensive attention. [0003] The switching bridge arm of the traditional three-phase inverter is composed of two switching tubes in series, and the switching bridge arm is directly connected in series with the DC power supply. In order to prevent the switching bridge arm from passing through, an appropriate dead time must be added to the switching tube. This will lead to the deterioration of the quality of the inverter output waveform, and when the inverter is disturbed, the two switch tubes...

Claims

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Application Information

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IPC IPC(8): H02M7/49
CPCH02M7/49H02M1/0067
Inventor 李尚葛红娟杨帆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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