System and method for compensating for back emission current in an X-ray generator

Patent metadata

Field	Value
Publication number	US-10750602-B2
Application number	US-201815994141-A
Country	US
Kind code	B2
Filing date	May 31, 2018
Priority date	Nov 10, 2017
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A system for compensating for a back emission current in an X-ray generator is provided. The system includes a transformer, a common, and a voltage source. The transformer is operative to provide power to an electron emitter of the X-ray generator. The common is electrically coupled to an anode of the X-ray generator. The anode is operative to receive electrons emitted by the electron emitter such that the back emission current is generated between the common and the electron emitter. The voltage source electrically couples the common to the transformer and is operative to generate an offset voltage that reduces the back emission current.

First claim

What is claimed is:

1. A system for compensating for a back emission current in an X-ray generator, the system comprising:
a transformer operative to provide power to an electron emitter of the X-ray generator;
a common electrically coupled to an anode of the X-ray generator, the anode operative to receive electrons emitted by the electron emitter such that a back emission current is generated between the common and the electron emitter; and
a voltage source that electrically couples the common to the transformer and is operative to generate an offset voltage that reduces the back emission current.

2. The system of claim 1 , wherein the electron emitter is floating with respect to the common.

3. The system of claim 1 , wherein the voltage source is electrically coupled to the transformer at a middle point of the transformer.

4. The system of claim 1 , wherein the voltage source includes at least one Zener diode.

5. The system of claim 4 , wherein the voltage source further includes a transistor electrically coupled in parallel to the at least one Zener diode.

6. The system of claim 5 , wherein the transistor is a MOSFET.

7. The system of claim 4 , wherein the voltage source further includes a capacitor electrically coupled in parallel to the at least one Zener diode.

8. The system of claim 1 , wherein the voltage source includes two or more Zener diodes electrically coupled to each other in series.

9. The system of claim 1 , wherein the offset voltage is between about 7 V to about 20 V.

10. The system of claim 9 , wherein the offset voltage is about twenty volts.

11. A method for compensating for a back emission current in an X-ray generator, the method comprising:
generating an offset voltage via a voltage source that electrically couples a common to a transformer that provides power to an electron emitter of the X-ray generator, the common further electrically coupled to an anode of the X-ray generator operative to receive electrons emitted by the electron emitter such that a back emission current is generated between the common and the electron emitter; and
reducing the back emission current via the offset voltage.

12. The method of claim 11 , wherein the electron emitter is floating with respect to the common.

13. The method of claim 11 , wherein the voltage source is electrically coupled to the transformer at a middle point of the transformer.

14. The method of claim 11 further comprising:
polarizing at least one Zener diode of the voltage source.

15. The method of claim 14 further comprising:
polarizing at least one transistor electrically coupled in parallel to the at least one Zener diode.

16. The method of claim 14 further comprising:
filtering a tube current of the X-ray generator via a capacitor disposed in parallel with the at least one Zener diode.

17. The method of claim 11 , wherein the offset voltage is between about 7 V to about 20 V.

18. The method of claim 17 , wherein the offset voltage is about twenty volts.

19. A non-transitory computer readable medium storing instructions that adapt a processor to:
generate an offset voltage via a voltage source that electrically couples a common to a transformer that provides power to an electron emitter of an X-ray generator, the common further electrically coupled to an anode of the X-ray generator operative to receive electrons emitted by the electron emitter such that the back emission current is generated between the common and the electron emitter; and
reduce the back emission current via the offset voltage.

20. The non-transitory computer readable medium of claim 19 , wherein the electron emitter is floating with respect to the common.

Assignees

• Gen Electric

Inventors

• Louvrier Yannick
• Nicolle Julien
• Robert Christophe
• Herve Elie
• Ernest Philippe

Classifications

• H01J35/101

  Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving · CPC title

• H02H7/042

  for current transformers · CPC title

• H02H9/002

  limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers · CPC title

• H01J35/065

  Field emission, photo emission or secondary emission cathodes · CPC title

• H02H9/02

  responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)} · CPC title