Control and performance of a zero-current-switched three-phase inverter equipped with resonant circuits on the AC-side

This paper presents a zero-current-switched voltage-fed inverter equipped with resonant circuits on the AC side. The current flowing through a switching device, i.e., an IGBT is a sum of the load current and the resonant current. If the amplitude of the resonant current is larger than that of the load current, the current in a switching device becomes zero at an instant in each resonant cycle. This allows the switching device to be turned on or off at the zero current. The zero-current-switching makes a significant contribution to reduction of switching losses and electromagnetic noises. In this paper, the principle of zero-current-switching operation, and a novel control scheme are described from a theoretical and practical point of view. Experimental results obtained from a laboratory system of 5 kVA verify the practicability. Moreover, the efficiency and losses of the proposed soft-switched inverter are compared with those of a hard-switched inverter

Digital Object Identifier: 10.1109/IAS.1996.560235
Published with permission from the copyright holder. This is the institute's copy, as published in Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE, 6-10 Oct. 1996, Volume 2, Pages 1235-1241.
Publisher URL:http://dx.doi.org/10.1109/IAS.1996.560235
Copyright © 1996 IEEE. All rights reserved.