Patent US3629073A successfully refreshed from Google Patents.
EP0138486A2
Expired / Lapsed
EP
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High voltage pulsed power supply for an x-ray tube
Assignee: Toshiba Corp
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Filing: 1984-09-28
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Granted: —
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Expires: 2004-09-28
Abstract
Abstract For supplying high voltage direct current to an X-ray tube (11), a high frequency inverter circuit (3, 8) is connected in series with a source (1) of direct current and a step-up transformer (2). The output of the transformer is rectified and applied across the X-ray tube (11). A nonlinear feedback loop (12, 13) is responsive to the rectified voltage and can supply an error signal through contacts (13d) to the inverter circuit (3 - 8) to bring the rectified voltage to a required value. Contacts (13d) are only closed when a comparator circuit (13e) detects that the rectified voltage has reached a datum value less than the required value.
Inventors
- 👤 Toshihiro C/O Patent Division Onodera
- 👤 Shigeru C/O Patent Division Tanaka
- 👤 Sunao C/O Patent Division Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 11:45
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/10; H05G1/20; H05G1/26; H05G1/30; H05G1/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
Apparatus for supplying high voltage direct current to an X-ray emitting device, comprising a high frequency inverter (3 - 8) connectable to a source (1) of direct current and including switching means (3, 4) for interrupting the direct current at a high frequency to produce high frequency alternating current, a transformer (2) connected to the inverter to increase the voltage of the high frequency alternating current, and rectifying means (9) connected to the transformer (2) for converting the increased voltage alternating current to high voltage direct current; characterised in the provision of non-linear feedback means (12, 13) responsive to the high voltage direct current for controlling the operation of the switching means (3, 4).
Claim 2
Dependent Claim
114 words
Apparatus for supplying high voltage direct current to an X-ray emitting device, comprising a high frequency inverter (3 - 8) connectable to a source (1) of direct current and including switching means (3, 4) for interrupting the direct current at a high frequency to produce high frequency alternating current, a transformer (2) connected to the inverter to increase the voltage of the high frequency alternating current, and rectifying means (9) connected to the transformer (2) for converting the increased voltage alternating current to high voltage direct current; characterised in the provision of non-linear feedback means (12, 13) responsive to the high voltage direct current for controlling the operation of the switching means (3, 4).
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1, wherein the non-linear feedback means includes a voltage divider (12) to detect the high voltage direct current.
Claim 4
Dependent Claim
52 words
Apparatus according to claim 2, wherein the switching means includes a main switch (3) actuated periodically at a predetermined rate and an auxiliary switch (4) actuated periodically at the predetermined rate but delayed in time from the actuations of said main switch, said non-linear feedback means controlling the amount of the delay.
Claim 5
Dependent Claim
94 words
Apparatus according to claim 2 or claim 3, wherein the non-linear feedback means includes: an error amplifier (13c) to generate an error signal in response to the detected high voltage direct current; loop switching means (13d) for supplying the error signal to the high frequency inverter when the loop switching means is closed and for denying the error signal to the high frequency inverter when said loop switching means is open; and means (13e, 13f) for closing said loop switching means when the detected high voltage direct current is greater than a predetermined voltage.
Claim 6
Dependent Claim
20 words
Apparatus according to any one of claims 2 to 4, wherein the non-linear feedback means includes a non-linear amplifier (13g).
Claim 7
Dependent Claim
119 words
Apparatus according to claim 2, wherein the high frequency inverter includes: a main switch (3) actuable by electrical pulses and connected in series with the source (1) of direct current; a capacitor (5) connected in parallel with the main switch (3); a diode (6) connected in parallel with said capacitor (5); an auxiliary switch (4) actuable by electrical pulses and connected in series with the main switch (3) and the source (1) of direct current; a pulse generator (7) to periodically supply the electrical pulses to the main switch (3); and a delay circuit (18) connected between the pulse generator (7) and the auxiliary switch (4) to periodically supply the electrical pulses to said auxiliary switch following a delay.
Claim 8
Dependent Claim
18 words
Apparatus according to claim 6, wherein the non-linear feedback means (12, 13) controls the amount of the delay.
Claim 9
Dependent Claim
24 words
Apparatus according to claim 6, wherein the non-linear feedback means (12, 13) controls the width of the electrical pulses from the pulse generator (7).
Claim 10
Dependent Claim
25 words
Apparatus according to claim 6, wherein the non-linear feedback means (12, 13) controls the repetition frequency of the electrical pulses from the pulse generator (7).
References Cited (Backward Citations)
No citation records indexed.
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