Electric lamp and discharge devices: systems – With automatic shunt and/or cutout
Patent
1988-03-25
1989-11-21
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With automatic shunt and/or cutout
315159, 361 86, 361 91, H05B 3700, H02H 318
Patent
active
048825220
ABSTRACT:
A neon sign circuit is disclosed having a neon tube forming the lighted portion of the sign, a source of electrical power, and a high voltage transformer between the electrical power source and the neon tube. The circuit also includes a neon sign circuit malfunction detector circuit. This circuit includes a ground fault detector connected in the circuit between the source of power and the transformer, to ground, and to the neutral load side of the primary windings of the transformer. A pair of adjustable spark gaps are each connected to one of the secondary windings of the transformer between the transformer and the neon tube. A light source is connected between each spark gap and ground and light sensitive resistors are positioned adjacent to each light source. The resistors are connected between the ground connection of the ground fault detector and the neutral load connection between the transformer and the ground fault detector so that when a malfunction in the neon sign circuit occurs,a spark will jump one of the spark gaps to energize the light source, increase the resistance of the light sensitive resistor and cause the ground fault detector to cut off power to the transformer, as if it was sensing a ground fault.
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LaRoche Eugene R.
Nguyen Truc
Paris Irin
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