High frequency inductive lamp and power oscillator
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. Various control circuitsmore »
- Inventors:
-
- Gaithersburg, MD
- Damascus, MD
- Frederick, MD
- Great Falls, VA
- Issue Date:
- Research Org.:
- Fusion Lighting, Inc., Rockville, MD (United States)
- OSTI Identifier:
- 873338
- Patent Number(s):
- 6137237
- 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:
- frequency; inductive; lamp; power; oscillator; inductively; coupled; electrodeless; excitation; coil; effective; electrical; length; half; wavelength; driving; applied; thereto; preferably; 100; mhz; 915; configured; non-helical; semi-cylindrical; conductive; surface; shape; wedding; 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; flanged; thermal; management; head; integrated; comprising; metal; matrix; composite; surrounding; insulating; integrally; formed; novel; solid-state; provides; rf; single; active; element; device; capable; providing; 70; watts; efficiency; various; control; circuits; employed; match; plurality; tuning; thermal management; electrodeless lamp; control circuits; applied thereto; integrally formed; metal matrix; inductively coupled; control circuit; spaced apart; rf power; matrix composite; active element; device capable; power oscillator; driving frequency; head comprising; conductive surface; various control; insulating ceramic; half wavelength; excitation coil; cylindrical conductive; /315/313/
Citation Formats
MacLennan, Donald A, Turner, Brian P, Dolan, James T, Kirkpatrick, Douglas A, and Leng, Yongzhang. High frequency inductive lamp and power oscillator. United States: N. p., 2000.
Web.
MacLennan, Donald A, Turner, Brian P, Dolan, James T, Kirkpatrick, Douglas A, & Leng, Yongzhang. High frequency inductive lamp and power oscillator. United States.
MacLennan, Donald A, Turner, Brian P, Dolan, James T, Kirkpatrick, Douglas A, and Leng, Yongzhang. Sat .
"High frequency inductive lamp and power oscillator". United States. https://www.osti.gov/servlets/purl/873338.
@article{osti_873338,
title = {High frequency inductive lamp and power oscillator},
author = {MacLennan, Donald A and Turner, Brian P and Dolan, James T and Kirkpatrick, Douglas A and Leng, Yongzhang},
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. Various control circuits may be employed to match the driving frequency of the oscillator to a plurality of tuning states of the lamp.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2000},
month = {Sat Jan 01 00:00:00 EST 2000}
}
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