Tri-level zero-current conversion soft switching inverter of active middle voltage clamp

Abstract

The invention relates to the field of electric and electronic inverter, and discloses a tri-level zero-current conversion soft switching inverter of active middle voltage clamp. The invention comprises a DC side positive pole, a DC side negative pole and a zero level; a first filtering capacitor is connected between the DC side positive pole and the zero level, and a second filtering capacitor isconnected between the negative pole and the zero level; each phase bridge arm comprises a first switching element, a second switching element, a third switching element, a fourth switching element, afifth switching element and a sixth switching element, wherein the first, the second, the third and the fourth elements are sequentially connected in series, the fifth switching element is connected between the shared node of the first and the second switching elements and the zero level, and the sixth switching element is connected between the of the third and the fourth switching elements and the zero level. The invention is characterized in that auxiliary switching elements and auxiliary diodes are connected between the shared node of the first and second switching elements and the shared node of the third and the fourth switching elements to form an auxiliary series connection circuit; a resonant capacitor and a resonant inductor which are sequentially connected in series are connectedbetween the shared node of the auxiliary switching elements and auxiliary diodes and the shared node of the second and the third switching elements.

Description

technical field [0001] The invention relates to the field of power electronic converters, in particular to a three-level zero-current switching soft-switching converter with active neutral point voltage clamping. Background technique [0002] In recent years, three-phase and single-phase power electronic converters, mainly represented by inverters (device converting direct current to alternating current) and rectifiers (device converting alternating current to direct current), have received more and more attention. and widely used. In typical applications of power electronic converters, such as uninterruptible power supplies, variable frequency drives for motors, and new energy generation such as wind energy and solar energy, many requirements are placed on the performance of power electronic converters, such as: high operating efficiency, high Power density, low output harmonics, low electromagnetic interference, etc. At present, most power electronic converters adopt "ha...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technology is that the auxiliary circuit is too complicated, and each auxiliary circuit contains 2 auxiliary switching devices, 2 auxiliary diodes, 2 resonant inductors, and 2 resonant capacitors

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