Multi-level cascading inverter with coupling inductors

Abstract

The invention discloses a multi-level cascading inverter with coupling inductors, wherein N inversion units are connected in parallel; each single-phase H bridge is corresponding to one coupling inductor; N is greater than or equal to 2, and N is a natural number; the upper bridge arms on the left bridge arm side of the same single-phase H bridge inversion unit are first power switch tubes; the lower bridge arms on the left bridge arm side of the same inversion unit are second power switch tubes; the upper bridge arms on the right bridge arm side of the same single-phase H bridge unit are third power switch tubes; the lower bridge arms on the right bridge arm side of the same single-phase H bridge unit are fourth power switch tubes; the first power tubes, the second power tubes, the third power tubes and the fourth power tubes are all insulated gate bipolar transistors (IGBT); and the N coupling inductors are connected through cyclic symmetrical structures. According to the multi-level cascading inverter with the coupling inductors, the loop current among the branch circuits can be effectively restrained under a condition of not requiring a complex current-sharing control method; and under the condition of the same parallel-connection common-mode inductance, the multi-level cascading inverter has the advantages of high difference mode current-sharing inductance, good current-sharing effect, small apparatus volume, and the like.

Description

technical field [0001] The invention belongs to the field of power electronics. More specifically, it designs a high-power rapid control power supply technology for realizing fast tracking and response to current or voltage signals, and designs a new method for suppressing loop current by using coupled inductance. Background technique [0002] In the study of controlled fusion, in order to maintain the stability of the plasma, it is necessary to quickly track and effectively control the plasma. A high-power, high-performance electric energy conversion technology can control the current generated by it through coil and plasma coupling, and the inverter power supply is an important part of it. The development of inverter power supply is closely related to the development of power electronic devices. Limited by the existing manufacturing process, there is a contradiction between the power handling capability and switching frequency of power electronic devices. The higher the p...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a multilevel inverter with coupled inductance, which reversely couples the currents of two adjacent branches through the coupled inductance, which not only improves the system suppression loop The ability of the circuit current, and solve the problem of excessive voltage drop on the inductor and the excessive volume and quality of the inductor caused by DC bias

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