Discharge lamp circuit with protected PTC resistor

Details Discharge lamp circuit with protected PTC resistor Discharge lamp circuit with protected PTC resistor

1986-04-21

1987-02-24

Dixon, Harold

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315100, 315102, 315309, H05B 3702

Patent

active

046459766

ABSTRACT:
An electrical device for igniting and supplying a low-pressure mercury vapor discharge lamp (11) provided with two preheatable electrodes (12,13). A series arrangement (12, 4, 14, 13) comprising the two lamp electrodes (12, 13), a PTC resistor (14) and a second winding (4) of a transformer fed back negatively with respect to a first winding (3) thereof is connected to a connection point of the first transforming winding. This series arrangement (12, 4, 14, 13) is further connected to a second connection point of the first transformer winding (3). Thus, the electrical device will readily ignite and supply the lamp and will also protect the PTC resistor of the electrical device should the lamp fail to ignite even with lamp electrodes that are uninterrupted.

REFERENCES:
patent: 2268512 (1941-12-01), McCarthy
patent: 2299499 (1942-10-01), Sanford
patent: 2476330 (1949-07-01), Sitzer
patent: 2849656 (1958-08-01), Karash
patent: 2935659 (1960-05-01), Zangerle
patent: 3097325 (1963-07-01), Cosnuau
patent: 3975660 (1976-08-01), Knobel et al.
patent: 4017761 (1977-04-01), Woldring

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