Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Delayed application of the discharge potential
Patent
1984-12-06
1989-12-05
Griffin, Robert L.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Delayed application of the discharge potential
315 3951, 219 1055B, 331 87, H05B 4114
Patent
active
048855065
ABSTRACT:
In a power-line-operated inverter-type magnetron power supply having a high-Q resonant L-C circuit series-excited by the inverter and parallel-loaded by the magnetron, subject invention provides for cost-effective means to prevent the destructive overload of the inverter and/or the L-C circuit that may occur during the brief period before the magnetron cathode becomes incandescent. In this power supply, the unfiltered pulsed DC output of a full-wave power-line-supplied rectifier means is applied to a pair of inverters: an auxiliary inverter for heating the magnetron cathode, and a main inverter for providing the main magnetron power. The auxiliary inverter starts operating immediately upon application of power from the power line, and therefore immediately starts the process of cathode heating. The main inverter, however, is not started until after the cathode has reached incandescence, at which time the magnetron will adequately load the series-resonant L-C circuit and thereby prevent such destructive overload.
REFERENCES:
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patent: Re31758 (1984-12-01), Nilssen
patent: 3717793 (1973-02-01), Peterson
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patent: 4076996 (1978-02-01), Maehara et al.
patent: 4194160 (1980-03-01), Loucks
patent: 4222098 (1980-09-01), Nagano
patent: 4593167 (1986-06-01), Nilssen
Griffin Robert L.
Salindong T.
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