H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 39/00 (2006.01) H01K 1/62 (2006.01) H05B 37/00 (2006.01)
Patent
CA 2155623
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.
Fincham Eric
Roy Gilles
LandOfFree
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