Composition for VO.sub.2 incandescent lamp current inrush limite

Details Composition for VO.sub.2 incandescent lamp current inrush limite Composition for VO.sub.2 incandescent lamp current inrush limite

1975-06-10

1976-11-23

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

106 395, H01B 108

Patent

active

039936031

ABSTRACT:
An improved composition of VO.sub.2 current inrush limiting ceramics for incandescent lamps using a 0.003-0.06 weight percent MoO.sub.3 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.

REFERENCES:
patent: 3402131 (1968-09-01), Futaki et al.
patent: 3557026 (1971-01-01), Teeg et al.
Japanese Journal of Applied Physics, vol. 8, No. 8, Aug. 1969.

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