US4439868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical X-ray radiation power supply apparatus
Assignee: J Morita Manufaturing Corp
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Filing: 1983-03-17
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Granted: 1984-03-27
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Expires: 2003-03-17
Abstract
Abstract The present invention relates to a medical X-ray radiation power supply apparatus wherein a DC-operated switching circuit is connected at the primary side of a high voltage transformer, and a comparator circuit compares the voltage predetermined by a tube voltage setting circuit with an actual tube voltage detected by a tube voltage detector circuit, then the gain of a comparison voltage is raised so that the actual tube voltage can quickly reach the predetermined tube voltage value, thereby tube voltage errors, which are caused by short photographing time in a medical or breast X-ray photographing apparatus, are eliminated.
Inventors
- 👤 Takao Makino
- 👤 Toshiaki Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:28
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/10; H05G1/20; H05G1/26; H05G1/30; H05G1/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
277 words
A medical X-ray radiation power supply apparatus comprising: a high voltage generation network comprising: a smoothing power supply circuit for rectifying commercially available power; a first switching power supply circuit coupled to an output of said smoothing power supply circuit, said switching power supply circuit further having a switching input; a high voltage transformer with primary and secondary windings, said primary winding be coupled to an output of said first switching power supply circuit; a first smoothing circuit coupled to said secondary winding and having its output coupled to an X-ray tube; an X-ray tube voltage detector coupled to said secondary windings for detecting the magnitude of the X-ray tube voltage; an X-ray tube setting circuit for setting an X-ray tube reference voltage; a comparator circuit for comparing said detected X-ray tube voltage with said reference voltage and for generating an output indicative of the comparison; and a first pulse-width modulator circuit which generates a pulse-width modulated pulse in response to the output of said comparator circuit, said pulse-width modulated pulse being supplied to said switching input of said first switch power supply circuit to control said tube voltage of said X-ray tube; a filament power supply network comprising; a second pulse-width modulator circuit coupled to said output of said smoothing power supply circuit; a second switching power supply circuit coupled to an output of said second pulse-width modulator circuit; a filament transformer having a primary and secondary windings, said primary winding being coupled to said second switching power supply circuit; and a second smoothing circuit coupled to said secondary winding of said filament transformer and having its output coupled to a filament of said X-ray tube.
Claim 2
Dependent Claim
277 words
A medical X-ray radiation power supply apparatus comprising: a high voltage generation network comprising: a smoothing power supply circuit for rectifying commercially available power; a first switching power supply circuit coupled to an output of said smoothing power supply circuit, said switching power supply circuit further having a switching input; a high voltage transformer with primary and secondary windings, said primary winding be coupled to an output of said first switching power supply circuit; a first smoothing circuit coupled to said secondary winding and having its output coupled to an X-ray tube; an X-ray tube voltage detector coupled to said secondary windings for detecting the magnitude of the X-ray tube voltage; an X-ray tube setting circuit for setting an X-ray tube reference voltage; a comparator circuit for comparing said detected X-ray tube voltage with said reference voltage and for generating an output indicative of the comparison; and a first pulse-width modulator circuit which generates a pulse-width modulated pulse in response to the output of said comparator circuit, said pulse-width modulated pulse being supplied to said switching input of said first switch power supply circuit to control said tube voltage of said X-ray tube; a filament power supply network comprising; a second pulse-width modulator circuit coupled to said output of said smoothing power supply circuit; a second switching power supply circuit coupled to an output of said second pulse-width modulator circuit; a filament transformer having a primary and secondary windings, said primary winding being coupled to said second switching power supply circuit; and a second smoothing circuit coupled to said secondary winding of said filament transformer and having its output coupled to a filament of said X-ray tube.
Claim 3
Dependent Claim
32 words
A medical X-ray radiation power supply apparatus according to claim 1 wherein said comparator circuit comprises amplifier means which amplifys the detected tube voltage whereby the tube voltage may be quickly changed.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 2 wherein said smoothing power supply circuit and said first and second smoothing circuits each comprise a diode bridge circuit.
Claim 5
Dependent Claim
18 words
An apparatus according to claim 3 wherein said X-ray tube setting circuit comprises a plurality of selectable resistors.
References Cited (Backward Citations)
US3974387A
Cited
US4221968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |