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High-Efficiency Class E, $\hbox {EF}_{2}$ , and $\hbox {E/F}_{3}$ Inverters
Kaczmarczyk, Z.
Dept. of Power Electron., Electr. Drives & Robotics, Silesian Univ. of Technol., Gliwice;

This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct. 2006
Volume: 53, Issue: 5
On page(s): 1584-1593
ISSN: 0278-0046
INSPEC Accession Number: 9167386
Digital Object Identifier: 10.1109/TIE.2006.882011
Current Version Published: 2006-10-02

Abstract
This paper investigates the new Class EF₂ inverter and the already known Class E and E/F₃ 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 EF₂ and E/F₃ 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, EF₂ and E/F₃ 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 EF₂ 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

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