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US 4,378,501 AGranted
Power supply for triode x-ray tubes
AssigneeSybron Corporation
InventorDavid Cowell
Life of this patent
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Abstract
A power supply provides high voltage for a grid controlled x-ray tube. In the supply an oscillator generates a high frequency signal which is amplified and transformed to kilovoltage. A voltage multiplier increases the kilovoltage to a potential suitable for the tube. The voltage multiplier includes a bank of series capacitors which tends to maintain a constant high voltage when the tube is not conducting.
Claims3
An X-ray power supply comprised of:
- an x-ray tube having a cathode, a grid, and an anode;
- an oscillator for generating a signal at a frequency substantially higher than line frequency;
- at least one linear amplifier connected to said oscillator to amplify said signal;
- a transformer having a primary and a seconary, the primary connected to said amplifier for transforming the amplified signal to a higher voltage across the secondary;
- a voltage multiplier, interposed between said secondary and the tube to provide a rectified voltage between the anode and the cathode at a multiple of the peak to peak voltage of the transformed amplified signal;
- pulse means for applying a plurality of voltage pulses to the tube grid resulting in a plurality of current pulses through the tube and corresponding plurality of x-ray emissions;
- and
- dosage means for turning off the X-ray when the current pulses integrated overtime corresponds to a desired X-ray dosage.
5 more elements
Dependencies are inferred from the claim text.