| 摘要 |
PROBLEM TO BE SOLVED: To keep a D.C. current from flowing from an X-ray tube to a filament transformer by cutting a D.C. current which flows from a D.C. high voltage power supply through an X-ray tube to shunt and flow into a D.C. high voltage power supply to which negative D.C. high voltage is applied through a secondary coil of the filament transformer. SOLUTION: To prevent D.C. biased magnetization of a filament transformer T1 due to the shunt current of an X-ray tube direct current, a capacitor C is connected in series between a filament XTb of an X-ray tube XT and one end T1a of a secondary coil of a transformer T1. By the capacitor C, a direct current from the X-ray the XT passes only a high voltage cable CB1 without passing through the secondary coil of the transformer T1 and flows into a D.C. high voltage power supply E2. Accordingly, a ferrite core and a troidal core of the transformer T1 are kept from being magnetized a direct current from the X-ray tube XT.
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