Wedding ring shaped excitation coil
Abstract
A high frequency inductively coupled electrodeless lamp includes an excitation coil with an effective electrical length which is less than one half wavelength of a driving frequency applied thereto, preferably much less. The driving frequency may be greater than 100 MHz and is preferably as high as 915 MHz. Preferably, the excitation coil is configured as a non-helical, semi-cylindrical conductive surface having less than one turn, in the general shape of a wedding ring. At high frequencies, the current in the coil forms two loops which are spaced apart and parallel to each other. Configured appropriately, the coil approximates a Helmholtz configuration. The lamp preferably utilizes an bulb encased in a reflective ceramic cup with a pre-formed aperture defined therethrough. The ceramic cup may include structural features to aid in alignment and/or a flanged face to aid in thermal management. The lamp head is preferably an integrated lamp head comprising a metal matrix composite surrounding an insulating ceramic with the excitation integrally formed on the ceramic. A novel solid-state oscillator preferably provides RF power to the lamp. The oscillator is a single active element device capable of providing over 70 watts of power at over 70% efficiency.
- Inventors:
-
- Gaithersburg, MD
- Olney, MD
- Issue Date:
- Research Org.:
- Fusion Lighting, Inc., Rockville, MD (United States)
- OSTI Identifier:
- 874150
- Patent Number(s):
- 6326739
- Assignee:
- Fusion Lighting, Inc. (Rockville, MD)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05B - ELECTRIC HEATING
- DOE Contract Number:
- FG01-95EE23796
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- wedding; shaped; excitation; coil; frequency; inductively; coupled; electrodeless; lamp; effective; electrical; length; half; wavelength; driving; applied; 100; mhz; 915; configured; non-helical; semi-cylindrical; conductive; surface; shape; frequencies; current; forms; loops; spaced; apart; parallel; appropriately; approximates; helmholtz; configuration; utilizes; bulb; encased; reflective; ceramic; cup; pre-formed; aperture; defined; therethrough; structural; features; alignment; andor; flanged; thermal; management; head; integrated; comprising; metal; matrix; composite; surrounding; insulating; integrally; formed; novel; solid-state; oscillator; provides; rf; power; single; active; element; device; capable; providing; 70; watts; efficiency; device capable; electrodeless lamp; driving frequency; excitation coil; half wavelength; /315/313/
Citation Formats
MacLennan, Donald A, and Tsai, Peter. Wedding ring shaped excitation coil. United States: N. p., 2001.
Web.
MacLennan, Donald A, & Tsai, Peter. Wedding ring shaped excitation coil. United States.
MacLennan, Donald A, and Tsai, Peter. Mon .
"Wedding ring shaped excitation coil". United States. https://www.osti.gov/servlets/purl/874150.
@article{osti_874150,
title = {Wedding ring shaped excitation coil},
author = {MacLennan, Donald A and Tsai, Peter},
abstractNote = {A high frequency inductively coupled electrodeless lamp includes an excitation coil with an effective electrical length which is less than one half wavelength of a driving frequency applied thereto, preferably much less. The driving frequency may be greater than 100 MHz and is preferably as high as 915 MHz. Preferably, the excitation coil is configured as a non-helical, semi-cylindrical conductive surface having less than one turn, in the general shape of a wedding ring. At high frequencies, the current in the coil forms two loops which are spaced apart and parallel to each other. Configured appropriately, the coil approximates a Helmholtz configuration. The lamp preferably utilizes an bulb encased in a reflective ceramic cup with a pre-formed aperture defined therethrough. The ceramic cup may include structural features to aid in alignment and/or a flanged face to aid in thermal management. The lamp head is preferably an integrated lamp head comprising a metal matrix composite surrounding an insulating ceramic with the excitation integrally formed on the ceramic. A novel solid-state oscillator preferably provides RF power to the lamp. The oscillator is a single active element device capable of providing over 70 watts of power at over 70% efficiency.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}
Works referenced in this record:
Electrodeless lamps for lighting: a review
journal, January 1993
- Wharmby, D. O.
- IEE Proceedings A Science, Measurement and Technology, Vol. 140, Issue 6
Class-F power amplifiers with maximally flat waveforms
journal, January 1997
- Raab, F. H.
- IEEE Transactions on Microwave Theory and Techniques, Vol. 45, Issue 11
A simple analysis of an inductive RF discharge
journal, August 1992
- Piejak, R. B.; Godyak, V. A.; Alexandrovich, B. M.
- Plasma Sources Science and Technology, Vol. 1, Issue 3
XLI. On the discharge of Electricity through exhausted tubes without electrodes
journal, October 1891
- Thomson, J. J.
- The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Vol. 32, Issue 197
Electrical and Light Characteristics of RF-Inductive Fluorescent Lamps
journal, January 1994
- Godyak, V. A.; Piejak, R. B.; Alexandrovich, B. M.
- Journal of the Illuminating Engineering Society, Vol. 23, Issue 1