X-ray apparatus
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United States of America Patent
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Jun 18, 1996
Grant Date -
N/A
app pub date -
Jan 21, 1994
filing date -
Jan 20, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An X-ray apparatus a includes a high-voltage generator (1) a combination of an X-ray tube (7) with an anode (13) and a cathode (15), connected in series with the X-ray tube, a series connection of a first resistor (9) and a control element (11) which acts as a variable resistance and has an anode (17), a cathode (19) and a control electrode (25), and a control circuit (27) which is suitable to generate a control voltage which is dependent on the electric voltage between the anode and the cathode of the X-ray tube and which appears at an output (33) which is connected to the control electrode of the control element, the arrangement being such that the voltage between the anode and the cathode of the X-ray tube is always substantially equal to a predetermined value, regardless of the current flowing through the X-ray tube. For very simple and inexpensive construction of the apparatus, the control circuit (27) includes a voltage divider which is connected parallel to the series connection of the first resistor ( 9) and the control element (11) and which is formed by a series connection of a second resistor (29) and a third resistor (31), the junction point of the second and the third resistor being the output (33) of the control circuit.
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