X-ray or gamma ray systems or devices – Electronic circuit – With switching means
Patent
1987-11-05
1990-04-03
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Electronic circuit
With switching means
378101, 378115, 378117, H05G 156
Patent
active
049146831
ABSTRACT:
An anode driving apparatus of a rotating anode X-ray tube includes a power source transformer connected to an AC power source, first and second taps, located at the secondary winding of the power source transformer, for outputting first and second AC voltages having the same phase, first and second switching elements respectively connected to the first and second taps and each made up of a solid state relay (SSR), an AC motor having a common terminal commonly connected to the first and second switching elements, a main terminal connected to a 0-voltage terminal of the power source transformer, and a subterminal connected to the 0-voltage terminal of the power source transformer via a phase shift capacitor, and a switching controller for turning on/off the first and second switching controller sequentially and continuously turns on the first and second switching elements, and sequentially applies the first and second AC voltages to the common terminal of the AC motor. When generation of the rotate signal is stopped, the switching controller periodically turns on/off the first switching element, at the same frequency as that of the first AC voltage, to half-wave rectify the first AC voltage, and applies a braking voltage to the common terminal of the AC motor.
REFERENCES:
patent: 2185826 (1940-01-01), Atlee
patent: 3456175 (1969-07-01), Bavor
patent: 4170735 (1979-10-01), Codina et al.
patent: 4458193 (1984-07-01), Jonsson
patent: 4585985 (1986-04-01), Bose
patent: 4672288 (1987-06-01), Abbondanti
Fields Carolyn E.
Kabushiki Kaisha Toshiba
Porta David P.
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