Radio-Frequency Inverters With Transmission-Line Input Networks
Name
Phinney radio-frequency.pdf
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805.75 KB
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Author(s)
Phinney, Joshua W.
Perreault, David J.
Lang, Jeffrey H.
Date Issued
July 2007
Journal
IEEE Transactions on Power Electronics
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Phinney, Joshua W., David J. Perreault, and Jeffrey H. Lang. “Radio-Frequency Inverters With Transmission-Line Input Networks.” IEEE Trans. Power Electron. 22, no. 4 (n.d.): 1154–1161. © 2007 IEEE
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1109/TPEL.2007.900465
