X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1992-10-06
1994-09-13
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378101, 378106, H05G 110
Patent
active
053475712
ABSTRACT:
A high frequency voltage generator (10) produces a high positive voltage and a high negative voltage. A parallel connected coil (26) and diode (30) are connected between the high voltage supply and a target (44) of an x-ray tube (40). A second parallel connected coil (28) and diode (32) are connected between the negative voltage and an electron source (42) of the x-ray tube. The coils are preferably a multiple pancake design (FIG. 3 ). When the tube starts to arc, the sudden increase in current flow through the coil is converted and stored in a magnetic field leaving only a small current to contribute to arcing. The coils are sized such that the current which passes to the x-ray tube is sufficiently small that the arcing is usually extinguished without an avalanche phenomenon occurring. The diodes permit the energy stored in the magnetic field to be converted into a current flow through the coil and diode such that the energy is dissipated as heat by the inherent electrical resistance of the coil with only a minimal amount of the energy passing over time to the x-ray tube.
REFERENCES:
patent: 3099789 (1963-07-01), Perrins
patent: 3588510 (1971-06-01), Gager
patent: 4816741 (1989-03-01), Ekstrand
patent: 4853946 (1989-08-01), Elliott et al.
patent: 5132999 (1992-07-01), Wirth
"Solenoid Selection and Protection", Coughlin, Design Engineering, vol. 51, No. 4, Oct. 1, 1980, pp. 45-48.
Bauer Carl F.
Furbee Avery D.
Miller Lester
Church Craig E.
Picker International Inc.
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