Gas discharge tube, indirectly heated cathode for use therein an

Details Gas discharge tube, indirectly heated cathode for use therein an Gas discharge tube, indirectly heated cathode for use therein an

1990-02-21

1991-09-10

Mis, David

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

315 49, 315 50, 315 58, 315107, H05B 4114

Patent

active

050476890

ABSTRACT:
A gas discharge tube comprises an indirectly heated cathode structure including a hot cathode into which a heater is incorporated. During discharging, the heater is supplied with a discharge current so as to generate Joule heat which is used as a heat source for the hot cathode. To this end, in a drive circuit in which the heater is preheated with a heater power source to initiate the discharging and to light up the discharge tube, followed by supply of discharging power from a discharging maintaining power source, a preheating switch is inserted between the heater and heater power source, and is opened at a start of the discharging and kept opened thereafter.

REFERENCES:
patent: 4438370 (1984-03-01), Allington
patent: 4742276 (1988-05-01), Ku

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