# US 5,349,493 A · Electrical capacitor

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- Number: US 5,349,493 A
- Document ID: US5349493A
- Status: Granted
- Kind: A
- Application number: 07/993,303
- Filed: 1992-12-18
- Granted: 1994-09-20
- Earliest claimed: 1992-12-18
- Assignees: Aerovox Incorporated
- Inventors: Paul Winsor, IV
- Web page: https://patentgrep.com/patent/US5349493A

## CPC

- H01G 4/005: Electrodes
- H01B 3/20: liquids, e.g. oils (silicone oils H01B3/46)
- H01G 4/22: impregnated
- 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)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

An electrical film capacitor in which a pair of metal film electrodes and a porous layer are wound into an assembly, and in which the porous layer serves to wick a liquid dielectric into the wound assembly. The liquid dielectric is an adipic acid ester such as di-isononyl adipate. Mono-isopropyl biphenyl can be added as well.

## Claims

### Claim 1

An electrical film capacitor comprising first and second film electrodes, a porous layer, and a liquid dielectric wicked along the extent of the porous layer, said first and second electrodes and porous layer being wound into a wound assembly, and said liquid dielectric consisting essentially of an adipic acid ester, alone or in combination with a biphenyl.

### Claim 2

An electrical film capacitor, comprising
a first film electrode;
a second film electrode extending generally parallel to and electrically isolated and spaced from said first film electrode;
a porous layer extending generally parallel to said first and second film electrodes
said first film electrode and said porous together comprising a metallized paper layer;
a liquid dielectric wicked along the extent of the porous layer, said liquid dielectric comprising an adipic acid ester;
said first and second film electrodes being wound into a wound assembly;
within the wound assembly, said porous layer being positioned between portions of said first and second film electrode;
a housing surrounding said wound assembly, and retaining said liquid dielectric; and
electrical conductors providing an electrical connection between each of said first and second film electrodes and the exterior of said housing.

### Claim 3 (depends on 1, 2)

The electrical film capacitor of claims 1 or 2 further comprising a solid dielectric spacer layer separating said first and second film electrodes.

### Claim 4 (depends on 1)

The electrical film capacitor of claim 1 wherein at least one of said film electrodes comprises a metallized layer on a surface of said porous layer.

### Claim 5 (depends on 4)

The electrical film capacitor of claim 4 wherein said porous layer is paper, at least one surface of which is metallized.

### Claim 6 (depends on 5)

The electrical film capacitor of claim 5 wherein said metallized paper layer forms said porous layer and said first film electrode, and wherein said second film electrode is a metal foil electrode.

### Claim 7 (depends on 1)

The electrical film capacitor of claim 1 wherein said porous layer is one of the dielectric layers of the capacitor.

### Claim 8 (depends on 7)

The electrical film capacitor of claim 7 wherein said porous layer comprises a layer of paper separate from said first and second film electrodes.

### Claim 9 (depends on 8)

The electrical film capacitor of claim 8 wherein said first and second film electrodes are metal foil electrodes.

### Claim 10 (depends on 1)

The electrical film capacitor of claim 1 wherein said first and second film electrodes are metal foil electrodes.

### Claim 11 (depends on 1, 2)

The electrical film capacitor of claims 1 or 2 wherein said wound assembly has been formed by folding said first and second film electrodes and porous layer.

### Claim 12 (depends on 1, 2)

The electrical film capacitor of claims 1 or 2 wherein said wound assembly has been formed by rolling up said first and second film electrodes and porous layer.

### Claim 13 (depends on 1, 2)

The capacitor of claims 1 or 2 wherein said adipic acid ester is di-isononyl adipate.

### Claim 14 (depends on 1, 2)

The capacitor of claims 1 or 2 wherein said liquid dielectric consists essentially of an adipic acid ester and mono-isopropyl biphenyl.

### Claim 15 (depends on 13)

The capacitor of claim 13 wherein said liquid dielectric consists essentially of di-isononyl adipate and mono-isopropyl biphenyl.

### Claim 16 (depends on 14)

The capacitor of claim 14 wherein said liquid dielectric consists essentially of an adipic acid ester and mono-isopropyl biphenyl in a 9:1 ratio.

### Claim 17 (depends on 16)

The capacitor of claim 16 wherein said adipic acid ester is di-isononyl adipate.

### Claim 18 (depends on 1, 2)

The capacitor of claims 1 or 2 wherein said liquid dielectric consists essentially of an adipic acid ester and a biphenyl.

### Claim 19 (depends on 1, 2)

The capacitor of claims 1 or 2 wherein said liquid dielectric consists essentially of an adipic acid ester and a biphenyl in a 9:1 ratio.