PAPI 1 style B combination lamp bypass and tilt switch and...

Details PAPI 1 style B combination lamp bypass and tilt switch and... PAPI 1 style B combination lamp bypass and tilt switch and...

2007-05-15

2007-05-15

Vu, David (Department: 2821)

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

Plural load device systems

C315S133000, C315S136000

Reexamination Certificate

active

11067183

ABSTRACT:
A Style B PAPI system comprises a plurality of identical lamp housing assemblies, each with one or more lamps and each housing assembly including: an electronic bypass circuit with first and second oppositely poled SCRs coupled across the terminals of each lamp; a zener diode; and a diode bridge for developing a first trigger voltage across the zener diode in the event of failure of a lamp. The first trigger voltage causes alternate conduction in the first and second SCRs from the AC voltage developed across the failed lamp. A lamp control circuit includes a third SCR that is coupled across the zener diode for developing a second trigger voltage for similarly driving the SCRs. The lamp control circuit is operated by a microcontroller-controlled common lamp control circuit that activates all of the lamp control circuits and disable all of the lamps in response to a tilt condition for the lamp housing assembly. All of the microcontrollers monitor a series-connected control loop that interconnects the lamp housing assemblies for activating all of the electronic bypass circuits in the event of a tilt condition occurring at any of the lamp housing assemblies.

REFERENCES:
patent: 3735339 (1973-05-01), Knudson
patent: 4396868 (1983-08-01), Watanabe et al.

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