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US 4,221,969 AGranted
X-ray voltage supply
AssigneeSybron Corporation
InventorManfred Schmidt
Life of this patent
Estimating the term…
Abstract
A voltage supply for an X-ray tube provides both high and low voltages to the tube. A high voltage transformer using split primary and secondary windings is employed. The high voltage is switched on and off by selectively phasing the voltage across the transformer's secondary coils. Low voltage is coupled from one of two primary windings.
Claims2
An X-ray voltage supply for providing a high cathode to anode and a low cathode heating voltage to an X-ray tube having a cathode and anode, said voltage supply comprised of:
- a high voltage transformer having a high voltage secondary winding and a primary winding;
- said secondary winding divided into two secondary coils, one coil connected to the anode and the other coil connected to the cathode;
- said primary winding divided into two primary coils,
- a first and second core, each core forming a magnetic circuit with one of said secondary coils and one of said primary coils;
- timing means for providing a switch-off signal and a switch-on signal;
- phasing means for selectively phasing the voltages across the secondary coils so that in response to a switch off signal, the secondary voltages are 180.degree. out of phase, canceling each other so that no high voltage appears between cathode and anode of the tube, resulting in no X-ray emission, and in response to a switch-on signal, said voltages are in phase and additive across cathode and anode, resulting in X-ray emission;
- a low voltage secondary winding associated with the same core as the secondary high voltage coil connected to the cathode, for providing low voltage to heat the cathode during both phase relationships.
4 more elements
Dependencies are inferred from the claim text.