Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1990-01-10
1991-06-25
Pascal, Robert J.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315107, 315310, 315DIG5, H05B 3702
Patent
active
050270338
ABSTRACT:
To prevent long-time current flow through a positive temperature coeffici resistor (KL) included in the heater circuit of one or more fluorescent lamps (LP, LP1, LP2), a relay is connected in circuit with the PTC resistor (KL), which will respond when the voltage across the capacitor (C4) reaches the level of d-c voltage derived from a relay rectifier (GL) and coupled to the PTC resistor itself. The relay operates a switch contact (S) which interrupts the current flow through the PTC resistor; the flow through the relay is small in comparison with the current flow through the PTC resistor, thereby saving energy and decrease in the heat loading on the circuit structure.
REFERENCES:
patent: 4438372 (1984-03-01), Zuchtriegel
patent: 4647817 (1987-03-01), Fahnrich et al.
Pascal Robert J.
Patent Treuhand Gesellschaft fur elektrische Gluhlampen mbH
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