High-Efficiency Class E, EF2, and ElF3 Inverters.

Authors :: Kaczmarczyk, Zbigniew
Source :: IEEE Transactions on Industrial Electronics; Oct2006, Vol. 53 Issue 5, p1584-1593, 10p, 1 Black and White Photograph, 3 Diagrams, 3 Charts, 7 Graphs
Publication Year :: 2006
Abstract: This paper investigates the new Class EF<subscript>2</subscript> inverter and the already known Class E and E/F<subscript>3</subscript> inverters. The purpose of this paper is to find the answer to the question: what should be added to a classic Class E inverter to improve its performance with minimum expenditure? Class EF<subscript>2</subscript> and E/F<subscript>3</subscript> inverters meet this requirement through operating under zero-voltage switching and zero-voltage slope switching conditions (as in Class E) with improved transistor waveforms (as in Class F and 1/F). Selected results of a numerical analysis of Class E, EF<subscript>2</subscript>, and E/F<subscript>3</subscript> inverters are shown and discussed. The analysis is aimed at maximizing the power output capabilities of these inverters for soft-switching conditions and fixed voltage and current stresses on their transistors as constraints. Measurement results of the Class EF<subscript>2</subscript> and E inverters are given to verify the validity of the presented theory. The measured output power of the inverters was 526 and 366 W with the total efficiency of 97.1% and 96.6% at 1 MHz, respectively. [ABSTRACT FROM AUTHOR]