X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1989-03-01
1991-12-31
Westin, Edward P.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378110, 378111, 378103, 378104, 378106, 378114, 378136, 378138, H05G 106, H05G 134, H05G 138, H05G 110
Patent
active
050777718
ABSTRACT:
A pulsed precision x-ray source includes a miniaturized internally self-shielding x-ray tube and an integral generator contained in a hand-held housing for generating timed bursts of x-ray having regulated energy level. A control grid and focus electrode within the tube enable precise on-off control of an electron beam directed to an x-ray emitting anode. The integral generator system includes an elongated, U-shaped unitary, molded plastic block mounted in the housing and includes a high voltage transformer having primary and secondary annular windings encased in a transformer portion of the block defining a central opening outside of the block for receiving a transformer core therethrough and, a capacitor-diode voltage multiplier stack connected to the secondary winding and having a positive node connectable to the anode and a negative node connectable to the cathode. A high voltage pulse width modulated switching circuit is connected to the primary annular winding to generate high voltages across said voltage multipler stack in order to control the energy of x-ray put out by the tube. A heater power supply supplies heater current to operate a heater in the tube. A focus element/grid control voltage power supply generates control voltages. A control circuit controls application of the control voltages to the focus element and the grid in order to switch the electron beam on and off in accordance with a preset value.
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Burrow Richard S.
Reynolds David C.
Skillicorn Brian
Harrison David B.
Kevex X-ray Inc.
Westin Edward P.
Wong Don
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