Electric lamp and discharge devices: systems – Automatic substitution of the load device or electrode – Diverse-type load device or electrode substituted
Patent
1979-04-13
1980-11-04
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Automatic substitution of the load device or electrode
Diverse-type load device or electrode substituted
315 87, 315 91, 315135, H05B 4146
Patent
active
042322529
ABSTRACT:
A lighting network is described which includes a main gas discharge lamp, a standby lamp and a control circuit. The control circuit senses when the gas discharge lamp is operating normally and turns off the standby lamp. When the discharge lamp is not up to full light output after ignition or has gone out due to a momentary power interruption, the control circuit turns on the standby lamp. The control circuit includes a transistor amplitude discriminator and an electronic switch. The discriminator, which senses the voltage at the discharge lamp terminals, has a transfer characteristic which produces a "low" output over a "normal" range of terminal voltages and a "high" output for terminal voltages below and above the normal range. The electronic switch responds to "high" and "low" discriminator outputs to turn on or turn off the standby lamp, respectively. The discriminator is realized in its simplest form by a transistor amplifier comprising a junction transistor in the emitter common configuration with an emitter connected resistance. The voltages at the discharge lamp terminals are coupled to the transistor input junction through a step down transformer. The transformed voltages effect large signal operation of the transistor taking it through cut-off; the active region with inverting signal transfer and gain; and finally high current saturation in which a voltage drop is produced in the emitter resistance to achieve a non-inverting unity gain signal transfer to produce the respective high, low and high outputs. A preferred electronic switch is a silicon controlled rectifier for control of the standby lamp.
REFERENCES:
patent: 3517254 (1970-06-01), McNamara, Jr.
patent: 3873882 (1975-03-01), Gershen
patent: 3927348 (1975-12-01), Zawadski
Baker Carl W.
General Electric Company
Lang Richard V.
LaRoche Eugene R.
Schlamp Philip L.
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