High output lamp with high brightness

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874615

Kirkpatrick, Douglas A ^[1]; Bass, Gary K ^[2]; Copsey, Jesse F ^[3]; Kwong, Vincent H ^[4]; Levin, Izrail ^[5]; MacLennan, Donald A ^[6]; Roy, Robert J ^[7]; Steiner, Paul E ^[8]; Tsai, Peter ^[8]; Turner, Brian P ^[9]

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1. Great Falls, VA
2. Mt. Airy, MD
3. Germantown, MD
4. Vancouver, CA
5. Silver Spring, MD
6. Gaithersburg, MD
7. Frederick, MD
8. Olney, MD
9. Damascus, MD

An ultra bright, low wattage inductively coupled electrodeless aperture lamp is powered by a solid state RF source in the range of several tens to several hundreds of watts at various frequencies in the range of 400 to 900 MHz. Numerous novel lamp circuits and components are disclosed including a wedding ring shaped coil having one axial and one radial lead, a high accuracy capacitor stack, a high thermal conductivity aperture cup and various other aperture bulb configurations, a coaxial capacitor arrangement, and an integrated coil and capacitor assembly. Numerous novel RF circuits are also disclosed including a high power oscillator circuit with reduced complexity resonant pole configuration, parallel RF power FET transistors with soft gate switching, a continuously variable frequency tuning circuit, a six port directional coupler, an impedance switching RF source, and an RF source with controlled frequency-load characteristics. Numerous novel RF control methods are disclosed including controlled adjustment of the operating frequency to find a resonant frequency and reduce reflected RF power, controlled switching of an impedance switched lamp system, active power control and active gate bias control.

• Research Organization: FUSION LIGHTING INC
• DOE Contract Number: FC01-97EE23776
• Assignee: Fusion Lighting, Inc. (Rockville, MD)
• Patent Number(s): US 6424099
• OSTI ID: 874615
• Country of Publication: United States
• Language: English

Related Subjects

output
lamp
brightness
ultra
bright
wattage
inductively
coupled
electrodeless
aperture
powered
solid
rf
source
range
tens
hundreds
watts
frequencies
400
900
mhz
numerous
novel
circuits
components
disclosed
including
wedding
shaped
coil
axial
radial
lead
accuracy
capacitor
stack
thermal
conductivity
cup
bulb
configurations
coaxial
arrangement
integrated
assembly
power
oscillator
circuit
reduced
complexity
resonant
pole
configuration
parallel
fet
transistors
soft
gate
switching
continuously
variable
frequency
tuning
six
directional
coupler
impedance
controlled
frequency-load
characteristics
control
methods
adjustment
operating
reduce
reflected
switched
active
bias
thermal conductivity
power control
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