Circuit arrangement

Patent metadata

Field	Value
Publication number	US-10652989-B2
Application number	US-201916385057-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Apr 23, 2018
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A circuit arrangement includes an X-ray tube, including a cathode and an anode, and a high-voltage transformer. In an embodiment, the high-voltage transformer includes at least one primary winding, at least one first secondary winding, including a first oscillating circuit, wherein the first oscillating circuit includes a first leakage inductance and a first winding capacitance, to adjust a first resonance frequency, and at least one second secondary winding, including a second oscillating circuit, wherein the second oscillating circuit includes a second leakage inductance and a second winding capacitance, to adjust a second resonance frequency, the first resonance frequency matching the second resonance frequency, the first winding capacitance and the second winding capacitance differing in value and the first leakage inductance and the second leakage inductance differing in value. The first secondary winding is electrically connected to the cathode and the second secondary winding is electrically connected to the anode.

First claim

What is claimed is:

1. A circuit arrangement, comprising:
an X-ray tube, including a cathode and an anode; and
a high-voltage transformer, including
at least one primary winding,
at least one first secondary winding, including a first oscillating circuit, wherein the first oscillating circuit includes a first leakage inductance and a first winding capacitance, to adjust a first resonance frequency, and
at least one second secondary winding, including a second oscillating circuit, wherein the second oscillating circuit includes a second leakage inductance and a second winding capacitance, to adjust a second resonance frequency, the first resonance frequency matching the second resonance frequency, the first winding capacitance and the second winding capacitance differing in value and the first leakage inductance and the second leakage inductance differing in value,

wherein the at least one first secondary winding is electrically connected to the cathode and the at least one second secondary winding is electrically connected to the anode.

2. The circuit arrangement of claim 1 , wherein a first load current is adjusted in the at least one first secondary winding during operation, wherein a second load current is adjusted in the at least one second secondary winding, wherein the first load current differs from the second load current by a differential current of the high-voltage transformer, proportional to a differential current of the X-ray tube.

3. The circuit arrangement of claim 2 , wherein the at least one primary winding forms a first cylinder having a first longitudinal axis, wherein the at least one first secondary winding and the at least one second secondary winding together form a second cylinder having a second longitudinal axis, wherein the first longitudinal axis is parallel to the second longitudinal axis and wherein the first cylinder is arranged offset relative to the second cylinder along the first longitudinal axis.

4. The circuit arrangement of claim 2 , wherein a winding wire of the at least one first secondary winding differs from a winding wire of the at least one second secondary winding according to at least one parameter including:
a thickness of the winding wire,
a thickness of an enamel insulation layer of the winding wire, or
a dielectric constant of the enamel insulation layer of the winding wire.

5. The circuit arrangement of claim 2 , wherein a first diameter of the at least one first secondary winding is relatively smaller than a second diameter of the at least one second secondary winding, and the first leakage inductance being relatively smaller than the second leakage inductance.

6. An X-ray unit, comprising:
an X-ray detector; and
the circuit arrangement of claim 2 .

7. A computed tomography unit, comprising:
the X-ray unit of claim 6 .

8. The circuit arrangement of claim 1 , wherein the at least one primary winding forms a first cylinder having a first longitudinal axis, wherein the at least one first secondary winding and the at least one second secondary winding together form a second cylinder having a second longitudinal axis, wherein the first longitudinal axis is parallel to the second longitudinal axis and wherein the first cylinder is arranged offset relative to the second cylinder along the first longitudinal axis.

9. The circuit arrangement of claim 8 , wherein a winding wire of the at least one first secondary winding differs from a winding wire of the at least one second secondary winding according to at least one parameter including:
a thickness of the winding wire,
a thickness of an enamel insulation layer of the winding wire, or
a dielectric constant of the enamel insulation layer of the winding wire.

10. The circuit arrangement of claim 1 , wherein a winding wire of the at least one first secondary winding differs from a winding wire of the at least one second secondary winding according to at least one parameter including:
a thickness of the winding wire,
a thickness of an enamel insulation layer of the winding wire, or
a dielectric constant of the enamel insulation layer of the winding wire.

11. The circuit arrangement of claim 1 , wherein a first diameter of the at least one first secondary winding is relatively smaller than a second diameter of the at least one second secondary winding, and the first leakage inductance being relatively smaller than the second leakage inductance.

12. The circuit arrangement of claim 1 , wherein the high-voltage transformer includes a primary coil body and a secondary coil body, wherein the secondary coil body includes a first secondary coil half and a second secondary coil half, wherein the first secondary coil half includes the at least one first secondary winding, wherein the second secondary coil half includes the at least one second secondary winding and wherein the first secondary coil half and the second secondary coil half are constructed asymmetrically to each other.

13. The circuit arrangement of claim 12 , wherein the at least one first secondary winding is arranged in a first chamber of the first secondary coil half together with at least one first paper insulation layer, wherein the at least one second secondary winding is arranged in a second chamber of the second secondary coil half together with at least one second paper insulation layer and wherein an arrangement of the first paper insulation layer relative to the at least one first secondary winding differs from an arrangement of the second paper insulation layer relative to the at least one second secondary winding.

14. The circuit arrangement of claim 13 , wherein the at least one first secondary winding is arranged in a first chamber of the first secondary coil half, wherein the at least one second secondary winding is arranged in a second chamber of the second secondary coil half and wherein a first width of the first chamber is relatively greater than a second width of the second chamber, the first winding capacitance being relatively greater than the second winding capacitance.

15. The circuit arrangement of claim 12 , wherein the at least one first secondary winding is arranged in a first chamber of the first secondary coil half, wherein the at least one second secondary winding is arranged in a second chamber of the second secondary coil half and wherein a first width of the first chamber is relatively greater than a second width of the second chamber, the first winding capacitance being relatively greater than the second winding capacitance.

16. The circuit arrangement of claim 1 , wherein the X-ray tube includes a metal central part and wherein a differential current of the X-ray tube is adjustable between the anode and the metal central part during operation.

17. The circuit arrangement of claim 1 , wherein at least one oscillating circuit throttle is interconnected between the high-voltage transformer and the X-ray tube.

18. The circuit arrangement of claim 1 , wherein at least one capacitor is interconnected between the high-voltage transformer and the X-ray tube.

19. An X-ray unit, comprising:
an X-ray detector; and
the circuit arrangement of claim 1 .

20. A computed tomography unit, comprising:
the X-ray unit of claim 19 .

Assignees

• Siemens Healthcare Gmbh

Inventors

• Waffler Stefan

Classifications

• H05G1/10 Primary

  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 title

• H01J35/025

  X-ray tubes with structurally associated circuit elements · CPC title

• H01F30/04

  having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies · CPC title

• H05G1/12 Primary

  with DC or rectified single-phase AC {or double-phase} · CPC title

• A61B6/03

  Computed tomography [CT] · CPC title