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
1985-05-31
1987-08-18
Chatmon, Saxfield
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315 35, 330 43, 331 82, 328172, H05B 3904, H05B 4136
Patent
active
046879706
ABSTRACT:
A digital cathode current control circuit for controlling the cathode current of a traveling wave tube (TWT) amplifier is disclosed. The cathode current control circuit includes circuitry for providing a comparison signal indicative of the occurrence and amplitude of TWT cathode current pulses; clocking circuitry responsive to the comparison signal for providing a clock signal delayed relative the occurrence of a cathode current pulse; comparison circuitry for comparing the comparison signal with predetermined reference signals indicative of a predetermined cathode current level, and for providing adjustment signals indicative of the adjustment of the TWT cathode current necessary to tend to achieve the predetermined cathode current; and counter circuitry clocked by the delayed clock signal for providing an output count in response to the adjustment signals.
REFERENCES:
patent: 3165696 (1965-01-01), Poole
patent: 3825839 (1974-07-01), Someya et al.
patent: 3872351 (1975-03-01), Smith et al.
patent: 4000471 (1976-12-01), Pankow
patent: 4398132 (1983-08-01), Razin et al.
patent: 4471265 (1984-09-01), Rasmusson
patent: 4525652 (1985-06-01), Sperzel et al.
Kelkar Anand
Musslyn Eugene F.
Chatmon Saxfield
Hughes Aircraft Company
Karambelas Anthony W.
Runk Thomas A.
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