Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements
Patent
1995-10-11
1999-03-30
Wong, Don
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Plural circuit elements
315 71, 31331811, H05B 3700
Patent
active
058893695
ABSTRACT:
To extend the lifetime of an incandescent lamp having a sealed glass envelope, an inert gas or gas mixture contained in the glass envelope, a tungsten filament mounted in the glass envelope, a hollow bulb screw or prefocus base mounted to the glass envelope, and first and second lead in wires for electrically connecting the tungsten filament to the base, a first rectifying diode is connected in series with the tungsten filament. Connected in parallel with the first rectifying diode is a series circuit including a resistor connected in series with a second rectifying diode. The first and second diodes are connected in opposite directions whereby the first rectifying diode applies to the filament the positive half-cycles of an alternating supply voltage, and the second rectifying diode applies to the tungsten filament the negative half-cycles attenuated by a voltage drop within the resistor.
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Fincham Eric
Vu David H.
Wong Don
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