Power losses and efficiency of class-E power amplifier at any duty ratio

Power losses and efficiency of class-E power amplifier at any duty ratio

This paper presents an analysis of the effect of duty ratio on power loss and efficiency of the Class-E amplifier. Conduction loss for each Class-E circuit component is derived and total amplifier losses and efficiency are expressed as functions of duty ratio. Two identical 300-W Class-E amplifiers...

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Veröffentlicht in:IEEE transactions on circuits and systems. 1, Fundamental theory and applications Fundamental theory and applications, 2004-09, Vol.51 (9), p.1675-1689
Hauptverfasser: Kessler, D.J., Kazimierczuk, M.K.
Format: Artikel
Sprache:eng
Schlagworte:
Amplifiers
Circuit testing
Circuits
Computational efficiency
Computing time
Conduction losses
Construction
Inductors
Laboratories
Mathematical analysis
MOSFET circuits
Paramagnetic resonance
Parasitic capacitance
Power amplifiers
Power loss
Radio frequency
Switches
Switching circuits
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Zusammenfassung:This paper presents an analysis of the effect of duty ratio on power loss and efficiency of the Class-E amplifier. Conduction loss for each Class-E circuit component is derived and total amplifier losses and efficiency are expressed as functions of duty ratio. Two identical 300-W Class-E amplifiers operating at 7.29 MHz are designed, constructed, and tested in the laboratory. Dependence of total efficiency upon duty ratio when using real components is derived and verified experimentally. Derived loss and efficiency equations demonstrate rapid drop in efficiency for low duty ratio (below approximately 30%). Experimental results very closely matched calculated power loss and efficiency.
ISSN:1549-8328
1057-7122
1558-0806
DOI:10.1109/TCSI.2004.834505