High voltage transformer

Patent metadata

Field	Value
Publication number	US-11250988-B2
Application number	US-201916435462-A
Country	US
Kind code	B2
Filing date	Jun 8, 2019
Priority date	Nov 30, 2015
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A high-voltage transformer is disclosed. The high-voltage transformer includes a transformer core; at least one primary winding wound once or less than once around the transformer core; a secondary winding wound around the transformer core a plurality of times; an input electrically coupled with the primary windings; and an output electrically coupled with the secondary windings that provides a voltage greater than 1,1200 volts. In some embodiments, the high-voltage transformer has a stray inductance of less than 30 nH as measured on the primary side and the transformer has a stray capacitance of less than 100 pF as measured on the secondary side.

First claim

That which is claimed:

1. A high-voltage transformer comprising:
a transformer core;
a primary winding comprising a conductive sheet that is wound at least partially around the transformer core;
a secondary winding wound around the transformer core a plurality of times;
an input electrically coupled with the primary windings; and
an output electrically coupled with the secondary windings that provides a voltage greater than 1200 volts;
wherein the high-voltage transformer has a stray inductance of less than 100 nH as measured on the primary side and the high-voltage transformer has a stray capacitance of less than 300 pF as measured on the secondary side, wherein the primary side includes the at least one primary winding, and the secondary side includes the at least one secondary winding.

2. The high-voltage transformer according to claim 1 , wherein the primary winding comprises a wire and a trace on a circuit board.

3. The high-voltage transformer according to claim 1 , wherein the at least one primary winding comprises a plurality of conductors wound less than one time around the transformer core.

4. The high-voltage transformer according to claim 1 , wherein the at least one secondary winding comprises a single conductor wound around the transformer core a plurality of times.

5. The high-voltage transformer according to claim 1 , wherein the transformer has at least one dimension selected from the group consisting of a radius, a width, a height, an inner radius, and an outer radius that is greater than 3 cm.

6. The high-voltage transformer according to claim 1 , wherein the transformer core has a toroid shape.

7. The high-voltage transformer according to claim 1 , wherein the transformer core has a cylinder shape.

8. The high-voltage transformer according to claim 1 , wherein the secondary winding comprises at least a first group of windings wound around the transformer core at a first location and a second group of windings wound around the transformer core at a second location that is separate from the first location.

9. The high-voltage transformer according to claim 1 , wherein each of at least a subset of the secondary windings are spaced further apart from the transformer core than one of a neighboring winding of the subset of the secondary windings.

10. The high-voltage transformer according to claim 1 , wherein each of a first subset of the secondary windings are spaced further apart from a second subset of the secondary windings.

11. The high voltage transformer according to claim 1 , wherein the transformer has a magnetizing inductance of less than 100 μH.

12. A high-voltage transformer comprising:
a transformer core;
an insulator disposed on outer surfaces of the transformer core;
a conductive sheet disposed on the insulator and wrapped around at least a portion of the transformer core;
a secondary winding wound around the transformer core a plurality of times;
an input electrically coupled with the conductor sheet; and
an output electrically coupled with the secondary windings that provides a voltage greater than 1200 volts
wherein the secondary winding comprises at least a first group of windings wound around the transformer core at a first location and a second group of windings wound around the transformer core at a second location that is separate from the first location to reduce or diminish the possibility of a corona discharge occurring in the thigh voltage transformer, the windings in each location are electrically serially coupled together; and
wherein the high-voltage transformer has a stray inductance of less than 30 nH as measured on the primary side and the transformer has a stray capacitance of less than 100 pF as measured on the secondary side, wherein the primary side includes the at least one primary winding, and the secondary side includes the at least one secondary winding.

13. The high-voltage transformer according to claim 12 ,
wherein the transformer core comprises an outside surface, a top surface, a bottom surface, and an inside surface; and
wherein the conductive sheet is disposed on the outside surface, the top surface, and the inside surface.

14. The high-voltage transformer according to claim 12 , further comprising a circuit board having one or more pads, wherein the conductive sheet terminates on the one or more pads.

15. The high-voltage transformer according to claim 12 , wherein the conductive sheet terminates with two or more wires.

16. The high-voltage transformer according to claim 12 , wherein the conductive sheet comprises a metallic layer that has been deposited on the transformer core using a deposition technique.

17. The high-voltage transformer according to claim 16 , wherein the deposition technique comprises thermal spray coating, vapor deposition, chemical vapor deposition, ion beam deposition, plasma, or thermal spray deposition.

18. The high-voltage transformer according to claim 16 , wherein the conductive sheet comprises a conductor that has been electroplated on the transformer core.

19. The high-voltage transformer according to claim 16 , wherein the transformer has at least one dimension selected from the group consisting of a radius, a width, a height, an inner radius, and an outer radius that is greater than 3 cm.

20. The high-voltage transformer according to claim 16 , wherein the high-voltage transformer has a stray capacitance of less than 300 pF as measured on the secondary side, wherein the secondary side includes the at least one secondary winding.

21. The high-voltage transformer according to claim 16 , wherein the high-voltage transformer has a stray inductance of less than 100 nH as measured on the primary side, wherein the primary side includes the at least one primary winding.

22. A high-voltage transformer comprising:
a transformer core;
an insulator disposed on outer surfaces of the transformer core;
a conductive sheet disposed on the insulator and wrapped around at least a portion of the transformer core;
a secondary winding wound around the transformer core a plurality of times;
an input electrically coupled with the conductor sheet; and
an output electrically coupled with the secondary windings that provides a voltage greater than 1200 volts
wherein the secondary winding comprises at least a first group of windings wound around the transformer core at a first location and a second group of windings wound around the transformer core at a second location that is separate from the first location to reduce or diminish the possibility of a corona discharge occurring in the thigh voltage transformer, the windings in each location are electrically serially coupled together;
wherein the high-voltage transformer has a stray inductance of less than 100 nH as measured on the primary side, wherein the primary side includes the at least one primary winding.

Assignees

• Eagle Harbor Tech Inc

Inventors

• Prager James R
• Ziemba Timothy M
• Miller Kenneth E
• Carscadden John G
• Slobodov Ilia

Classifications

• H01F27/34 Primary

  Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields · CPC title

• H01F27/306

  Fastening or mounting coils or windings on core, casing or other support · CPC title

• H01F27/303

  Clamping coils, windings or parts thereof together · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F27/24

  Magnetic cores · CPC title