# US 2013/0154766 A1 · Feed through emc filter

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- Number: US 2013/0154766 A1
- Document ID: US20130154766A1
- Status: Published application
- Kind: A1
- Application number: 13/689,286
- Filed: 2012-11-29
- Published: 2013-06-20
- Earliest claimed: 2011-12-20
- Assignees: Schaffner EMV AG
- Inventors: Fabian BECK; Benedikt Othmar Scheller
- Web page: https://patentgrep.com/patent/US20130154766A1

## CPC

- H04B 15/00: Suppression or limitation of noise or interference (by means associated with receiver H04B1/10)
- H03H 1/0007: {of radio frequency interference filters}
- H03H 7/00: Multiple-port networks comprising only passive electrical elements as network components
- H03H 2001/0021: {Constructional details}
- H04B: TRANSMISSION
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## Abstract

An EMC power filter comprising a filter circuit and a conductive housing (1) enclosing the filter circuit, wherein said filter circuit comprises: at least one electric conductor (3) consisting in a rigid busbar for carrying an electric power; at least one ferromagnetic element (4) for modifying the impedance of the electric conductor (3); at least one capacitor (5) electrically connected between the electric conductor (3) and the conductive housing (1); The housing has a tubular shape with a square cross section, allowing a rotation of the filter of 90° within the housing.

## Claims

### Claim 1

An EMC power filter comprising a filter circuit and a conductive housing enclosing the filter circuit, wherein said filter circuit comprises:
at least one electric conductor consisting in a rigid busbar for carrying an electric power;
at least one ferromagnetic element for modifying the impedance of the electric conductor;
at least one capacitor electrically connected between the electric conductor and the conductive housing;
characterised in that
said housing has a tubular shape with a square cross section, allowing a rotation of the filter of 90° within the housing.

### Claim 2 (depends on 1)

The EMC power filter of claim 1, wherein said housing has four extruded sides defining said square cross section.

### Claim 3 (depends on 2)

The EMC power filter of claim 2, wherein said housing is made of aluminium.

### Claim 4 (depends on 1)

The EMC power filter of claim 1, comprising at least one insulating cover for watertight closing of one of the extremities of the housing, said conductor traversing said cover.

### Claim 5 (depends on 1)

The EMC power filter of claim 1, comprising at least one contact spring for establishing an electrical contact between at least one of said capacitors and said housing.

### Claim 6 (depends on 1)

The EMC power filter of claim 1, wherein at least one of said capacitors has a first face and a second face in opposition, each one of which comprises an electric terminal, wherein said faces are flat, and the capacitor is inserted and tightly held in position between the conductive housing and the electric conductor so as to create an electric contact between housing and conductor and the corresponding terminal of capacitor

### Claim 7 (depends on 6)

The EMC power filter of claim 6, wherein at least one of said electric terminals is in direct physical, or with the conductive housing.

### Claim 8 (depends on 1)

The EMC power filter of claim 1, in which at least one of said capacitors is connected solderless to the housing and/or to the electric conductor.

### Claim 9 (depends on 1)

The EMC power filter of claim 1, in which at least one of said capacitors is connected solderless to the housing and/or to the electric conductor

### Claim 10 (depends on 1)

The EMC power filter of claim 1, further comprising a plastic holder frame for holding said capacitors and said ferromagnetic element around said electric conductor.

### Claim 11 (depends on 10)

The EMC power filter of claim 10, said plastic holder frame comprising two elongated parts mutually clipsed to each other around said electric conductor and within said housing.

### Claim 12 (depends on 1)

The EMC power filter of claim 1, comprising a potting compound for transmitting heat from the electric components to the housing and a sealing part assembly of synthetic material for protecting said capacitors from said potting compound.

### Claim 13 (depends on 12)

The EMC power filter of claim 12, said sealing part assembly comprising two sealing elements, at least one of said sealing elements comprising at least one window through which a contact spring establishes an electric contact between one of said capacitor and said housing.