Inductive stabilization ballast for a discharge lamp

Details Inductive stabilization ballast for a discharge lamp Inductive stabilization ballast for a discharge lamp

1977-09-28

1980-06-17

LaRoche, Eugene R.

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, 315283, 315309, 315DIG5, 361 37, H05B 4136

Patent

active

042086167

ABSTRACT:
An inductive stabilization ballast for a low-pressure mercury vapor discharge lamp having preheatable electrodes. The ballast includes a protective device which comprises a positive temperature coefficient resistor. The inductive portion of the ballast and the PTC resistor are disposed in the ballast so as to be insulated relative to one another, both electrically and thermally. The PTC resistor is connected in series with a glow starter in the preheating circuit of the lamp electrodes. Thus, the electric current in the case of a non-starting lamp is kept at a harmless low level and, in the case of a normally operating lamp the PTC resistor does not disturb the lamp operation.

REFERENCES:
patent: 3701925 (1972-10-01), Nozawa et al.
patent: 3872350 (1975-03-01), Powell et al.

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