Three-phase dual-input inverter not having bridge arm shoot-through risk

Abstract

The present invention discloses a three-phase dual-input inverter not having a bridge arm shoot-through risk. The three-phase dual-input inverter is composed of two independent input sources, nine switch tubes, seven diodes and six filtering inductors and has 48 working modes. When the inverter is located in any one mode, one of or both of an upper tube and a lower tube of a bridge arm is or are in reverse series connection with one diode in a topology, thereby avoiding a shoot-through structure, and being high in reliability. According to the present invention, the double input power supplies and the increased switch tubes S2, S5 and S8 and the diode D0 are utilized to form the five-level output having a very simple structure, the voltages of the double input sources Vin1 and Vin2 of a system are different, and by controlling, a purpose of supplying power to the inverter in a time-sharing manner is achieved. If the input source Vin1 is obtained by boosting the input source Vin2, a part of output power of the system comes from the input source Vin1 directly, and the other part comes from a boost unit, thereby realizing the single-stage transformation of the partial power, not only reducing the capacity of the boost unit, but also improving the efficiency of the system.

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 dual-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, a suitable 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 still...

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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

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