NDLI: Radio-Frequency Inverters With Transmission-Line Input Networks

Content Provider	IEEE Xplore Digital Library
Author	Phinney, J.W. Perreault, D.J. Lang, J.H.
Copyright Year	1986
Abstract	A soft-switching inverter topology (the Class Phi ) is presented which draws dc source current through a transmission line or a lumped-network approximation of a distributed line. By aligning the inverter switching frequency just below the line's lambda/4-wave resonance, the Class Phi topology enforces odd-and even-harmonic content in its drain voltage and input current, respectively. The symmetrizing action of the transmission-line dynamics results in natural square-wave operation of the switch, reducing the inverter stresses (relative to a Class E) for a given power throughput. The inverter waveforms and normalized power-output capability are analyzed in simple terms, and supported by measurements of an inverter built around a length of distributed line, and an inverter incorporating a lumped L-C ladder network. The latter implementation is constructed with air-core magnetics and inter-layer capacitances that are integrated into the thickness of a printed-circuit board. A comparison with a Class E inverter of similar size and ratings demonstrates the small passive-component values and manufacturing advantages afforded by the Class Phi topology.
Sponsorship	IEEE Power Electronics Society
Starting Page	1154
Ending Page	1161
Page Count	8
File Size	827785
File Format	PDF
ISSN	08858993
Volume Number	22
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Inverters Transmission lines Network topology Switches Power transmission lines Switching frequency Resonance Voltage Stress transmission line Distributed system inverter lumped model
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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