X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1990-06-20
1991-11-19
Westin, Edward P.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378109, H05G 134
Patent
active
050671430
ABSTRACT:
A current detecting circuit for an X-ray tube is disclosed which includes a DC high voltage generating circuit connected across a filament and an anode of the X-ray tube and current detecting means connected in series in a filament circuit. The filament, which is at a high potential, receives a power from a secondary winding of an isolation transformer, which has sufficient dielectric strength to insulate a highest voltage generated by said DC high voltage generating circuit. A rectifier circuit is arranged to rectify a current fed from said secondary winding or another winding having same dielectric strength as that of said secondary winding, and said rectifier circuit supplies a power to a signal transmitting circuit. The signal transmitting circuit is energized, according to the current detected by said current detecting means, to transmit an output signal. The output signal is transmitted through electrically isolated transmission means to a signal receiving circuit, which is at a ground potential.
In case of an X-ray tube of double-filament type having a large focal spot filament and a small focal spot filament, switching means is provided to automatically change over a resistance of a current detecting resistor, in accordance with selection of the large focal filament and the small focal spot filament.
REFERENCES:
patent: 3963931 (1976-06-01), Shapiro
patent: 4670893 (1987-06-01), Tsuchiya
Japanese Patent Application Laid-Open No. SHO 63-269068; Nov. 7, 1988.
Japanese Utility Model Application Laid-Open No. SHO 62-73499; May 11, 1987.
Japanese Utility Model Application Laid-Open No. SHO 62-86100; Jun. 1, 1987.
Japanese Utility Model Application Laid-Open No. SHO 62-109400; Jun. 13, 1987.
Matsumoto Tetsuya
Watanabe Kiyomi
Origin Electric Co., Ltd.
Westin Edward P.
Wong Don
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