Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1978-02-03
1980-02-12
Church, Craig E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250413, 250421, H05G 130
Patent
active
041885368
ABSTRACT:
In dental x-ray apparatus a control is provided for driving the high voltage transformer in the tube head at a frequency far above power line frequency. The transformer is driven with an inverter. A precision d-c voltage regulator that operates in an "add-on" mode and thus only handles a portion of the output current controls the voltage supplied to the inverter. The d-c voltage regulator is supplied a voltage by a transformerless a-c/d-c converter whose output is proportional to the 60 Hz power line voltage that supplies it. The x-ray tube filament transformer is also driven at a frequency above power line frequency. Means are provided to cut off power to the x-ray tube if its current does not reach a certain value within a short time after an exposure is initiated. Means are provided for isolating high voltage power circuits from low voltage control circuits.
REFERENCES:
patent: 3125679 (1964-03-01), Ohde
patent: 3567940 (1971-03-01), Lambert
patent: 3828194 (1974-08-01), Grasser
patent: 3917949 (1975-11-01), Wenkler
patent: 3925672 (1975-12-01), Soder
Church Craig E.
General Electric Company
Hohenfeldt Ralph G.
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