Transformer for high-voltage X-ray generator

• US 6,967,559 B2
• Filed: 03/15/2004
• Issued: 11/22/2005
• Est. Priority Date: 11/10/1999
• Status: Expired due to Term

• Current Assignee: Electromed International Limited
• Original Assignee: Electromed International Limited
• Inventors: Beland, Robert
• Primary Examiner(s): HAN, YOUNGHUIE JESSICA
• Application Number:
  US10/801,079
• Publication Number:
  US 20040264222A1
• Time in Patent Office: 617 Days
• Field of Search: 323/250, 323/251, 336/198, 336/208, 336/213, 336/219, 336/220, 336/223, 296/05, 296/06, 296/09
• US Class Current: 336/219
• CPC Class Codes: H02M 1/0077 Plural converter units whose outputs are connected in series
• CPC Class Codes: H02M 1/088 for the simultaneous control of series or parallel connected semiconductor devices
• CPC Class Codes: H02M 3/3376 with automatic control of output voltage or current
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02M 7/49 Combination of the output voltage waveforms of a plurality of converters
• 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 1/12 with dc or rectified single-phase ac or double-phase
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
• CPC Class Codes: Y10T 29/49071 by winding or coiling

Abstract

A power supply for a device which has a load, comprising a first resonant generator and a second resonant generator, coupled in parallel, each generator having a phase output. The power supply further comprises a control circuit coupled to the first and second generators controlling the first and second phase outputs, wherein the first phase output and the second phase output are summed to provide a variable power supply to the load.

Claims

1. A transformer device comprising:

a single core comprising a substantially rectangular shaped magnet having four sides, wherein two sides of the rectangular shaped magnet are parallel to each other;

two primary windings forming coils each having a substantially cylindrical shape, each primary winding being mounted co-axially with respect to one of the two parallel sides of the magnet; and

two secondary windings forming coils each having a substantially cylindrical shape, each secondary winding being located and arranged concentrically with one primary winding and having its cylindrical axis substantially aligned with said one parallel side of the magnet.

2. The transformer device as claimed in claim 1, wherein the power through the transformer is balanced between the two parallel sides.

3. The transformer as claimed in claim 1, further comprising a tertiary winding mounted on each of the two primary windings.

4. The transformer as claimed in claim 3, wherein the two tertiary windings are coupled in parallel.

5. The transformer as claimed in claim 1, further comprising an insulating compound between each pair of the primary and secondary windings being arranged concentrically.

6. The transformer as claimed in claim 1, wherein the two primary windings are coupled in parallel.

7. The transformer device as claimed in claim 1, wherein said primary winding is wound on a substantially cylindrical bobbin positionable over one parallel side.

8. The transformer device as claimed in claim 7, wherein said secondary winding is wound on a substantially cylindrical bobbin located over the primary winding, and the bobbins of said primary and secondary windings are arranged concentrically.

9. The transformer device as claimed in claim 8 including a space between said primary winding and said secondary winding, said space being filled with an insulator.

10. The transformer device as claimed in claim 9 wherein said insulator comprises a silicone rubber.

11. The transformer device as claimed in claim 8, wherein said bobbin of said secondary winding includes ribs.

12. A transformer device for an X-ray generating device, comprising:

a single core comprising a substantially rectangular shaped magnet having four sides, wherein two sides of the rectangular shaped magnet are opposing to each other;

two primary windings, each primary winding mounted co-axially with respect to one of the opposing sides of the magnet; and

two secondary windings, each secondary winding mounted co-axially with respect to one primary winding and co-axially with respect to one of the opposing sides of the magnet, wherein said secondary winding is connected to a load of said X-ray generating device and arranged for a resonant transfer of energy.

13. The transformer device for an X-ray generating device, as claimed in claim 12, wherein an output of each secondary winding is connected to a capacitor forming an LC element.

14. The transformer device for an X-ray generating device, as claimed in claim 13 further including a full-wave rectifier bridge connected in parallel to the output of said secondary winding.

15. The transformer device for an X-ray generating device, as claimed in claim 14 further including a filter capacitor coupled across an output of said full-wave rectifier bridge.

16. The transformer device as claimed in claim 12, wherein said primary winding is wound on a substantially cylindrical bobbin positionable over one of said two opposing sides.

17. The transformer device as claimed in claim 16, wherein said secondary winding is wound on a substantially cylindrical bobbin located over said primary winding, and said bobbins of said primary and secondary windings are arranged concentrically.

18. The transformer device as claimed in claim 17 including a space between said primary winding and said secondary winding being arranged concentrically, said space being filled with an insulator.

19. The transformer device as claimed in claim 18, wherein said insulator comprises a silicone rubber.

20. The transformer device as claimed in claim 17, wherein said bobbin of said secondary winding includes ribs.

21. The transformer device for an X-ray generating device, as claimed in claim 16, wherein each said primary winding is wound together with a tertiary winding as a bifilar winding on said bobbin.

22. The transformer device for an X-ray generating device, as claimed in claim 21, wherein at least two of said tertiary windings are connected in parallel.

23. A transformer device comprising:

a single magnetic core comprising two parallel sides;

two primary windings and two tertiary windings, one said primary winding and one said tertiary winding being wound together on a primary bobbin positionable over one of said parallel sides of said magnetic core; and

two secondary windings each being wound on a secondary bobbin, said primary bobbin and said secondary bobbin being concentrically located with respect to each other and said coils wound on said bobbins defining a concentric space being filled by an insulator, wherein said two primary windings are coupled in parallel and said two tertiary windings are coupled in parallel.

24. The transformer device as claimed in claim 23, wherein said filled insulator comprises a silicone rubber casted in said concentric space.

25. The transformer device as claimed in claim 23, wherein said bobbin of said secondary winding includes ribs.