# US 2021/0241966 A1 · Magnetic phase isolating harmonic filter for multi-phase power apparatus and method of use thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0241966 A1
- Document ID: US20210241966A1
- Status: Published application
- Kind: A1
- Application number: 17/235,770
- Filed: 2021-04-20
- Published: 2021-08-05
- Earliest claimed: 2007-04-05
- Assignees: CTM Magnetics, Inc.
- Inventors: Hans Wennerstrom; Grant A. MacLennan
- Web page: https://patentgrep.com/patent/US20210241966A1

## CPC

- H01F 27/2895: {Windings disposed upon ring cores}
- H01F 41/04: for manufacturing coils {(coils for transformer or inductances H01F27/28)}
- H01F 3/10: Composite arrangements of magnetic circuits
- H01F 27/085: {Cooling by ambient air}
- H01F 27/10: Liquid cooling
- H01F 27/255: made from particles (H01F27/26 takes precedence)
- H01F 27/266: {Fastening or mounting the core on casing or support (on coil H01F27/30)}
- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 27/2876: {Cooling (cooling transformers and inductances in general H01F27/08)}
- H01F 27/306: {Fastening or mounting coils or windings on core, casing or other support}
- H01F 27/324: {Insulation between coil and core, between different winding sections, around the coil; Other insulation structures}
- H01F 37/00: Fixed inductances not covered by group H01F17/00
- H02M 1/126: {using passive filters}
- H01F 1/24: the particles being insulated
- H01F 27/08: Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02)
- H01G 4/38: Multiple capacitors, i.e. structural combinations of fixed capacitors
- H01G 4/40: Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
- H02M 1/123: {Suppression of common mode voltage or current}
- H02M 5/4585: {having a rectifier with controlled elements}
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

The invention comprises a harmonic filter apparatus and method of use thereof for magnetically isolating and filtering individual phases of three-phase power comprising a delta circuit that includes: (1) a first leg connecting to a second leg and a third leg and (2) first circuitry on the first leg matching second circuitry on the second leg, the first circuitry comprising at least two contactors electrically wired in parallel, the harmonic filter magnetically isolating individual phases of three-phase power, where inductor—coupled inductor pairs couple apexes of the delta circuit to individual phases of the three-phase power.

## Claims

### Claim 1

A method for filtering power, comprising the steps of:
magnetically isolating phases of three phase electrical power with a harmonic filter, said harmonic filter comprising:
a first inductor—first coupled inductor pair connected to a first phase of the three phase electrical power and a first apex of a delta circuit;
a second inductor—second coupled inductor pair connected to a second phase of the three phase electrical power and a second apex of said delta circuit; and
a third inductor—third coupled inductor pair connected to a third phase of the three phase electrical power and a third apex of a delta circuit.

### Claim 2 (depends on 1)

The step of claim 1, said step of magnetically isolating phases, further comprising the steps of:
magnetically isolating a first phase of the three phase electrical power from both: a second phase of the three phase electrical power and a third phase of the electrical power; and
magnetically isolating the second phase of the three phase electrical power from the third phase of the three phase electrical power.

### Claim 3 (depends on 1)

The method of claim 1, further comprising the step of:
connecting said harmonic filter to the three phase electrical power with both of: (1) a first contactor positioned in a first leg of said delta circuit between said first apex and said second apex and (2) a second contactor positioned in a second leg of said delta circuit between said first apex and third second apex.

### Claim 4 (depends on 1)

The method of claim 1, further comprising the step of
connecting said harmonic filter to the three phase electrical power with both of: (1) a first contactor and a second contactor positioned in a first leg of said delta circuit between said first apex and said second apex and (2) a third contactor and a fourth contactor positioned in a second leg of said delta circuit between said first apex and third second apex.

### Claim 5 (depends on 1)

The method of claim 1, further comprising the step of:
filtering the three phase electrical power with a first capacitor and a second capacitor wired in parallel between said first apex and said second apex of said delta circuit.

### Claim 6 (depends on 5)

The method of claim 5, further comprising the step of:
constructing the first capacitor with metallized film.

### Claim 6 (depends on 6)

hod of claim 6, further comprising the step of:
filtering current in excess of 140 amperes with said first capacitor, said first capacitor comprising a capacitance rating greater than 20 μF.

### Claim 8 (depends on 1)

The method of claim 1, further comprising the step of:
alternatingly connecting and disconnecting said delta circuit of said harmonic filter from the three phase power by alternatingly closing and opening at least two contactors within said delta circuit.

### Claim 9 (depends on 1)

The method of claim 1, further comprising the step of:
alternatingly connecting and disconnecting said delta circuit of said harmonic filter from the three phase power by alternatingly closing and opening at least two contactors within between said first apex and said second apex of said delta circuit.

### Claim 10 (depends on 1)

The method of claim 1, further comprising the step of:
fabricating said first inductor of said first inductor—first coupled inductor pair with:
a core; and
a fabricated winding comprising a plurality of turns, at least a first turn of said plurality of turns comprising: a first sub-section and a second sub-section, said first sub-section electrically connected to said first sub-section with a first non-wire electrical connection.

### Claim 11 (depends on 1)

The method of claim 1, further comprising the step of:
electrically joining together a first sub-section and a second sub-section of a first electrical turn, of said first inductor of said first inductor—first coupled inductor pair.

### Claim 12 (depends on 11)

The method of claim 11, said step of electrically joining comprising at least one of:
bolting together said first sub-section and said second sub-section of said first turn;
welding together said first sub-section and said second sub-section of said first turn;
inserting said first sub-section into said second sub-section of said first turn;
fusing said first sub-section to said second sub-section of said first turn during a winding process;
fastening said first sub-section to said second sub-section of said first turn; and
clipping together said first sub-section and said second sub-section of said first turn.

### Claim 13 (depends on 1)

The method of claim 1, further comprising the step of:
passing current through at least ten windings wired electrically in parallel about an inductor core of said first inductor of said first inductor—first coupled inductor pair.

### Claim 14 (depends on 1)

The method of claim 1, further comprising the step of:
filtering the three phase electrical power with each of said first inductor—first coupled inductor pair, said second inductor—second coupled inductor pair, and said third inductor—third coupled inductor pair,
a capacitor electrically linked to said first inductor, of said first inductor—first coupled inductor, said first inductor comprising: (1) an inductor core comprising a distributed gap material and (2) an inductor winding comprising at least ten wires wound about a section of said distributed gap material of said inductor core, said at least ten wires wired electrically in parallel.

### Claim 15

An apparatus for filtering power, comprising:
a harmonic filter comprising:
a first inductor—first coupled inductor pair connected to a first phase of the three phase electrical power and a first apex of a delta circuit;
a second inductor—second coupled inductor pair connected to a second phase of the three phase electrical power and a second apex of said delta circuit;
a third inductor—third coupled inductor pair connected to a third phase of the three phase electrical power and a third apex of a delta circuit,
said harmonic filter magnetically isolating from each other individual phases of three phase electrical power.

### Claim 16 (depends on 15)

The apparatus claim 15, said first inductor of said first inductor—first coupled inductor pair further comprising at least one of:
a triangular, a square, a rectangle, a pentagon, a hexagon, and an oval cross-section, said first inductor further comprising an aperture therethrough.

### Claim 17 (depends on 15)

The apparatus of claim 15, said first inductor of said first inductor—first coupled inductor pair further comprising:
a cast winding.

### Claim 18 (depends on 15)

The apparatus of claim 15, said harmonic filter further comprising:
at least one inductor comprising an annealed compressed powder core.