X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1993-06-22
1999-10-12
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378 97, H05G 144
Patent
active
059664258
ABSTRACT:
A high-voltage power supply and regulator circuit for an X-ray tube which utilizes solid-state switching devices with feedback control for real time monitoring and protection against failure due to excess current or voltage spikes. The apparatus includes a DC supply circuit utilizing a first feedback control loop and silicon controlled rectifiers to regulate the output of a high-voltage transformer. The apparatus further includes a regulator circuit utilizing a second feedback control loop and a series of FETs to produce a continuous or pulsed output of precise magnitude and phase. Shielded voltage dividers are provided to accurately measure the voltage outputs and produce feedback control signals. Discharge modules on the high-voltage cables connecting the power supplying X-ray tube discharge any capacitive voltage remaining on the cables between pulses, so as to eliminate any tail on the output waveform. A current measuring apparatus and excess current detector are provided to protect against excess currents. Patient dosage feedback is derived from an X-ray exposure sensor placed behind the patient receiving the X-ray radiation. At one or more times during the initial exposure period, the output of the X-ray tube is modified in order to obtain a 100% density image while minimizing the patient exposure.
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Church Craig E.
Electromed International
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