Protection device for high intensity gaseous discharge lamp starting circuit
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United States of America Patent
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Nov 8, 1983
Grant Date -
N/A
app pub date -
Dec 21, 1981
filing date -
Dec 21, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thickfilm manufactured resistive element that functions as a normal resistor in an HID lamp starting circuit where high voltage starting pulses are produced, but which exhibits a negative and extremely non-linear voltage coefficient of resistance characteristic when potentially destructive high voltage spikes occur as a result of circuit interruption during operation of the lamp. The resistive element is comprised of a mixture of refractory conductive, semiconductive, and nonconductive materials of an amorphous noncrystalline nature having the physical structure of a supercooled liquid, commonly referred to as glass, which has been discovered to exhibit the property of having an extremely non-linear voltage coefficient of resistance.
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