A Novel Electrolytic Capacitor-Less Multilevel Inverter with Coupled Inductor

Abstract

In this thesis a novel multilevel electrolytic capacitor-less inverter is proposed With the three-winding coupled inductor input voltage can be divided without electrolytic capacitors Hence no voltage-balancing circuit is needed Less power switches are required for the proposed circuit compared to the existing topologies Only ten switches are required to generate seven-level output The operating principle mode analysis and modulation method are introduced The control scheme is implemented by TMS320F28035 Finally a laboratory prototype of seven-level inverter with 320V input voltage and 220 Vrms/3kW output is implemented The efficiency under full load is 94 82% the maximum efficiency is 96 39% under 74 34 % load Lastly extended circuits are also proposed

Date of Award	2014 Aug 18
Original language	English
Supervisor	Jiann-Fuh Chen (Supervisor)