Power supply device for X-ray tube

• US 5,187,737 A
• Filed: 07/30/1991
• Issued: 02/16/1993
• Est. Priority Date: 08/27/1990
• Status: Expired due to Term

• Current Assignee: Origin Electric Company Limited
• Original Assignee: Origin Electric Company Limited
• Inventors: Watanabe, Kiyomi
• Primary Examiner(s): Porta, David P.
• Application Number:
  US07/737,746
• Time in Patent Office: 567 Days
• Field of Search: 378/105, 378/101, 378/102, 378/103, 378/104, 378/106, 378/107, 378/109, 378/110, 363/17, 363/61, 363/62
• US Class Current: 378/105
• CPC Class Codes: H05G 1/08 Electrical details
• CPC Class Codes: H05G 1/10 Power supply arrangements for feeding the X-ray tube supply circuits with converters in general H02M; supply circuits for emitters and amplifiers H04B1/16 - H04B1/1623
• CPC Class Codes: H05G 1/20 with high-frequency ac; with pulse trains pulse generators in general H03K3/00, H03K4/00
• CPC Class Codes: H05G 1/34 Anode current, heater current or heater voltage of X-ray tube

Abstract

A power supply device for an X-ray tube includes first and second capacitors connected in series at one ends thereof which are connected with a secondary winding of a high-tension transformer. Connectedly arranged between a positive output terminal and the ground are first and second diodes which are connected in series to assume the same polarity, each having a cathode as a positive output side, a connecting point of the first and second diodes being connected with the other end of the first capacitor. Also connectedly arranged between a negative output terminal and the ground are third and fourth diodes which are connected in series to assume the same polarity, each having an anode as a negative output side, a connecting point of said third and fourth diodes being connected with the other end of the second capacitor. First and second high-tension cables include a covering conductor connected with the ground, respectively. The first high-tension cable is connectedly arranged between the positive output terminal and an anode of the X-ray tube, whereas the second high-tension cable is connectedly arranged between the negative output terminal and a cathode of the X-ray tube.

Claims

1. An X-ray device having an X-ray tube, positive and negative output terminals, and a neutral point between positive and negative output voltages which is connected with a ground, the X-ray device comprising:

a high-tension inverter;

a high-tension transformer having primary and secondary windings, said primary winding being connected with said high-tension inverter, said secondary winding having one end connected with the ground and having another end;

first and second capacitors connected in series at first ends thereof, said first ends of said first and second capacitors being connected with said another end of said secondary winding of said high-tension transformer;

third and fourth capacitors connected in series at first ends thereof, said first ends of said third and fourth capacitors being connected with the ground, said third capacitor having a second end thereof connected with the positive output terminal, said fourth capacitor having a second end thereof connected with the negative output terminal, said third capacitor including an earth capacitance of a first high-tension cable connectedly arranged between said positive output terminal and an anode of the X-ray tube, said fourth capacitor including an earth capacitance of a second high-tension cable connectedly arranged between said negative output terminal and a cathode of the X-ray tube;

first and second diodes connected in series, said first diode having an anode connected with said second diode at a cathode thereof, said anode of said first diode and said cathode of said second diode being connected with a second end of said first capacitor, said first diode having a cathode connected with the positive output terminal, said second diode having an anode connected with the ground; and

third and fourth diodes connected in series, said third diode having a cathode connected with said fourth diode at an anode thereof, said cathode of said third diode and said anode of said fourth diode being connected with a second end of said second capacitor, said third diode having an anode connected with the negative output terminal, said fourth diode having a cathode connected with the ground.

2. An X-ray device as claimed in claim 1, wherein said secondary winding of said high-tension transformer is single in number.

3. An X-ray device as claimed in claim 1, wherein said first and second high-tension cables are substantially the same in length.

4. An X-ray device as claimed in claim 1, further comprising:

tube current detecting circuit means for detecting a current passing through the X-ray tube.

5. An X-ray device as claimed in claim 4, wherein said tube current detecting circuit means are connectedly arranged between said cathode of said fourth diode and the ground.

6. An X-ray device as claimed in claim 4, wherein said tube current detecting circuit means are connectedly arranged between said anode of said second diode and the ground.

7. An X-ray device having an X-ray tube, positive and negative output terminals, and a neutral point between positive and negative output voltages which is connected with the ground, the X-ray device comprising:

a high-tension inverter;

a high-tension transformer having primary and secondary windings, said primary winding being connected with said high-tension invertor, said secondary winding having one end connected with the ground;

first and second capacitors connected in series at one ends thereof, said one ends of said first and second capacitors being connected with said secondary winding of said high-tension transformer at the other end thereof;

first and second diodes connected in series, said first diode having an anode connected with said second diode at a cathode thereof, said anode of said first diode and said cathode of said second diode being connected with the other end of said first capacitor, said first diode having a cathode connected with the positive output terminal, said second diode having an anode connected with the ground;

third and fourth diodes connected in series, said third diode having a cathode connected with said fourth diode at an anode thereof, said cathode of said third diode and said anode of said fourth diode being connected with the other end of said second capacitor, said third diode having an anode connected with the negative output terminal, said fourth diode having a cathode connected with the ground; and

first and second high-tension cables having a covering conductor connected with the ground, respectively, said first high-tension cable connectedly arranged between the positive output terminal and an anode of the X-ray tube, said second high-tension cable connectedly arranged between the negative output terminal and a cathode of the X-ray tube.

8. An X-ray device as claimed in claim 7, wherein said secondary winding of said high-tension transformer is single in number.

9. An X-ray device as claimed in claim 7, wherein said first and second high-tension cables are substantially the same in length.

10. An X-ray device as claimed in claim 7, further comprising:

tube current detecting circuit means for detecting a current passing through the X-ray tube.

11. An X-ray device as claimed in claim 10, wherein said tube current detecting circuit means are connectedly arranged between said cathode of said fourth diode and the ground.

12. An X-ray device as claimed in claim 10, wherein said tube current detecting circuit means are connectedly arranged between said anode of said second diode and the ground.