Composition for vo2 incandescent lamp current inrush limiters

Details Composition for vo2 incandescent lamp current inrush limiters Composition for vo2 incandescent lamp current inrush limiters

H - Electricity

01

J

31/202, 315/68

H01J 21/00 (2006.01) H01J 19/00 (2006.01) H01K 1/62 (2006.01)

Patent

CA 1050747

ABSTRACT OF THE DISCLOSURE An improved composition of V02 current inrush limiting ceramics for incandescent lamps using a 0.003-0.06 weight percent MoO3 addition. This addition modifies the resistance-temperature relationship to provide a more gradual transition and also to provide a resistance which varies less at temperatures below the transition temperature. The more gradual change is desirable as it reduces the tendency for a delayed current overshoot and also reduces the tendency for the current to be funnelled through a relatively small portion of the thermistor. The more nearly constant low temperature resistance provides good current inrush limiting in a wider range of ambient temperatures.

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