# US 6,426,610 B1 · Controlled ferroresonant constant current source

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- Number: US 6,426,610 B1
- Document ID: US6426610B1
- Status: Granted
- Kind: B1
- Application number: 09/904,997
- Filed: 2001-07-13
- Granted: 2002-07-30
- Earliest claimed: 2001-07-13
- Assignees: Shape Electronics, Inc.
- Inventors: Raymond Janik
- Web page: https://patentgrep.com/patent/US6426610B1

## CPC

- H01F 29/14: with variable magnetic bias
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A controlled ferroresonant constant current source includes a ferromagnetic core accommodating the below-mentioned inductors. An input coil is to be connected to an alternating voltage source. An output coil is inductively coupled to the input coil, and is to be connected to a load. A control coil is inductively coupled to the output coil, and is to be connected to a switch for regulating the current output of the constant current source. A first capacitor coil is inductively coupled to the output coil, and is to be connected to a capacitor to provide a first resonant sub-circuit having maximum gain. A second capacitor coil is inductively coupled to the control inductor, and is to be connected to the capacitor to provide a second resonant sub-circuit to control resonant gain.

## Claims

### Claim 1

A controlled ferroresonant constant current source, comprising:
a ferromagnetic core;
an input coil disposed about the core, the input coil to be connected to an alternating voltage source;
an output coil disposed about the core and inductively coupled to the input coil, the output coil to be connected to a load;
a control coil disposed about the core and inductively coupled to the output coil, the control coil to be connected to a switch for regulating the current output of the constant current source;
a first capacitor coil disposed about the core and inductively coupled to the output coil, the first capacitor coil to be connected to a capacitor to provide a first resonant sub-circuit having maximum gain; and
a second capacitor coil disposed about the core and inductively coupled to the control coil, the second capacitor coil to be connected to a capacitor to provide a second resonant sub-circuit to control resonant gain.

### Claim 2 (depends on 1)

A controlled ferroresonant constant current source as defined in claim 1, wherein the coils are arranged along a length of the core in the following sequence: control coil, second capacitor coil, input coil, first capacitor coil and output coil.

### Claim 3 (depends on 1)

A controlled ferroresonant constant current source as defined in claim 1, wherein each of the first and second capacitor coils includes a plurality of windings disposed about the core.

### Claim 4 (depends on 1)

A controlled ferroresonant constant current source as defined in claim 1, wherein the ferromagnetic core includes EI laminations.

### Claim 5 (depends on 1)

A controlled ferroresonant constant current source as defined in claim 1, wherein the ferromagnetic core includes two E laminations.

### Claim 6 (depends on 1)

A controlled ferroresonant constant current source as defined in claim 1, wherein the ferromagnetic core includes strip steel.

### Claim 7 (depends on 1)

A controlled ferroresonant constant current source as defined in claim 1, wherein the ferromagnetic core includes UI laminations.

### Claim 8

A controlled ferroresonant constant current source, comprising:
a ferromagnetic core;
an input coil disposed about the core, the input coil to be connected to an alternating voltage source;
an output coil disposed about the core and inductively coupled to the input coil, the output coil to be connected to a load;
a control coil disposed about the core and inductively coupled to the output coil, the control coil connected to a switch for regulating the current output of the constant current source;
a first capacitor coil connected to a capacitor, and disposed about the core and inductively coupled to the output coil; and
a second capacitor coil connected to a capacitor, and disposed about the core and inductively coupled to the control coil, the first capacitor coil for providing a first resonant sub-circuit to generate maximum gain, and the second capacitor coil for providing a second resonant sub-circuit to control resonant gain.

### Claim 9 (depends on 8)

A controlled ferroresonant constant current source as defined in claim 8, wherein the coils are arranged along a length of the core in the following sequence: control coil, second capacitor coil, input coil, first capacitor coil and output coil.

### Claim 10 (depends on 8)

A controlled ferroresonant constant current source as defined in claim 8, wherein each of the first and second capacitor coils includes a plurality of windings disposed about the core and to be connected to an associated capacitor.

### Claim 11 (depends on 8)

A controlled ferroresonant constant current source as defined in claim 8, wherein the capacitor associated with the first capacitor coil includes a plurality of capacitors coupled in parallel with one another, and the capacitor associated with the second capacitor coil includes a plurality of capacitors coupled in parallel with one another.

### Claim 12 (depends on 8)

A controlled ferroresonant constant current source as defined in claim 8, wherein the ferromagnetic core includes EI laminations.

### Claim 13 (depends on 8)

A controlled ferroresonant constant current source as defined in claim 8, wherein the ferromagnetic core includes two E laminations.

### Claim 14 (depends on 8)

A controlled ferroresonant constant current source as defined in claim 8, wherein the ferromagnetic core includes strip steel.

### Claim 15 (depends on 8)

A controlled ferroresonant constant current source as defined in claim 8, wherein the ferromagnetic core includes UI laminations.