Direct current link inductor for power source filtration

• US 20070115085A1
• Filed: 11/18/2005
• Published: 05/24/2007
• Est. Priority Date: 11/18/2005
• Status: Abandoned Application

• Current Assignee: Hamilton Sundstrand Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Hamilton Sundstrand Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Clemmons, James
• Application Number:
  US11/283,109
• Publication Number:
  US 20070115085A1
• Time in Patent Office: Days
• US Class Current: 336/181
• CPC Class Codes: H01F 2003/103 Magnetic circuits with permanent magnets
• CPC Class Codes: H01F 27/34 Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
• CPC Class Codes: H01F 27/42 Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H
• CPC Class Codes: H01F 29/14 with variable magnetic bias amplitude modulation by means of variable impedance element H03C1/08 ; magnetic amplifiers H03F; circuits for automatic telephonic communication H04M3/00
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00
• CPC Class Codes: H03H 7/09 Filters comprising mutual inductance

Abstract

An inductor with a primary winding on a magnetic core that produces a primary magnetic field H1 with a current I₁ has an electromagnetic field source that generates a secondary magnetic field H₂ in the core that opposes the primary magnetic field H₁ to produce a low net magnetic field H_NET in the core to prevent magnetic saturation of the core.

Claims

1. A direct current (DC) link inductor with a primary winding for receiving DC on a magnetic core that produces a primary magnetic field H₁ with a current I₁, comprising:

an electromagnetic field source independent of a return circuit path for the current I₁ in the primary winding that generates a secondary magnetic field H₂ in the core that opposes the primary magnetic field H₁ to produce a low net magnetic field H_NET in the core to prevent magnetic saturation of the core.

2. The inductor of claim 1, wherein the secondary magnetic field H₂ of the secondary magnetic field source subtracts from the primary magnetic field H₁ in the magnetic core of the inductor to produce a net magnetic field H_NET.

3. The inductor of claim 1, wherein the electromagnetic field source comprises a secondary auxiliary winding on the magnetic core with a current I₂.

4. The inductor of claim 3, wherein the secondary magnetic field H₂ has an intensity that cancels the intensity of the primary magnetic field H₁ in the magnetic core.

5. The inductor of claim 4, wherein the level of current I₂ changes with the level of current I₁.

6. The inductor of claim 5, further comprising a feedback circuit that changes the level of current I₂ in response to changes in level of current I₁.

7. The inductor of claim 6, wherein the feedback circuit measures back electromotive force (EMF) developed across the primary winding to generate the level of current I₂ in response to changes in level of current I₁.

8. The inductor of claim 7, wherein the feedback circuit compares the back EMF developed across the primary winding to a reference electrical potential to generate the level of current I₂ in response to changes in level of current I₁.

9. A direct current (DC) link inductor with a primary winding for receiving DC on a magnetic core that produces a primary magnetic field H₁ with a current I₁, comprising:

a secondary auxiliary winding on the magnetic core independent of a return circuit path for the current I₁ in the primary winding with a current I₂ that generates a secondary magnetic field H₂ in the core such that it cancels the primary magnetic field H₁ to produce a low net magnetic field H_NET in the core to prevent magnetic saturation of the core.

10. The inductor of claim 9, wherein the secondary magnetic field H₂ has an intensity that cancels the intensity of the primary magnetic field H₁ in the magnetic core.

11. The inductor of claim 10, wherein the level of current I₂ changes with the level of current I₁.

12. The inductor of claim 11, further comprising a feedback circuit that changes the level of current I₂ in response to changes in level of current I₁.

13. The inductor of claim 12, wherein the feedback circuit measures back electromotive force (EMF) developed across the primary winding to generate the level of current I₂ in response to changes in level of current I₁.

14. The inductor of claim 13, wherein the feedback circuit compares the back EMF developed across the primary winding to a reference electrical potential to generate the level of current I₂ in response to changes in level of current I₁.

15. An electrical power source that supplies direct current (DC) to a load and filters the supplied DC, comprising:

a DC link inductor with a primary winding for receiving DC on a magnetic core that produces a primary magnetic field H₁ with a current I₁ and an electromagnetic field source independent of a return circuit path for the current I₁ in the primary winding that generates a secondary magnetic field H₂ in the core that opposes the primary magnetic field H₁ to produce a low net magnetic field H_NET in the core to prevent magnetic saturation of the core.

16. The power source of claim 15, wherein the secondary magnetic field H₂ of the electromagnetic field source subtracts from the primary magnetic field H₁ in the magnetic core of the inductor to produce a net magnetic field H_NET.

17. The power source of claim 15, wherein the electromagnetic field source comprises a secondary auxiliary winding on the magnetic core with a current I₂.

18. The power source of claim 17, wherein the secondary magnetic field H₂ has an intensity that cancels the intensity of the primary magnetic field H₁ in the magnetic core.

19. The power source of claim 18, wherein the level of current I₂ changes with the level of current I₁.

20. The power source of claim 19, further comprising a feedback circuit that changes the level of current I₂ in response to changes in level of current I₁.

21. The power source of claim 20, wherein the feedback circuit measures back electromotive force (EMF) developed across the primary winding to generate the level of current I₂ in response to changes in level of current I₁.

22. The power source of claim 21, wherein the feedback circuit compares the back EMF developed across the primary winding to a reference electrical potential to generate the level of current I₂ in response to changes in level of current I₁.