Audiophile cable transferring power substantially free from phase delays

• US 5,110,999 A
• Filed: 12/04/1990
• Issued: 05/05/1992
• Est. Priority Date: 12/04/1990
• Status: Expired due to Term

• Current Assignee: Ultralink Products Incorporated
• Original Assignee: Todd Barbera
• Inventors: Barbera, Todd
• Primary Examiner(s): NIMMO, MORRIS
• Application Number:
  US07/622,003
• Time in Patent Office: 518 Days
• Field of Search: 174/36, 174/115, 174/116, 174/113 C, 174/131 A, 174/107
• US Class Current: 174/36
• CPC Class Codes: H01B 11/1091 with screen grounding means, e.g. drain wires
• CPC Class Codes: H01B 11/12 Arrangements for exhibiting specific transmission characteristics

Abstract

The invention provides a compact, circular, flexible, and shielded twin-axial, multi-stranded power cable for transferring current instantaneously and with uniform density substantially free from phase delays at 60 Hz. between a high current power amplifier and a standard three-hole 112 volt AC outlet achieving a pure and powerful bass response and clear, brilliant noise-free highs. The cable has two bundles of five insulated conductors helically and symmetrically wrapped around a dielectric center. The gauge of each conductor and total cross-sectional area of the bundled conductors are predetermined to avoid internal inductance and phase delay effects while providing high current instantaneously and uniformly in high-end audio power applications. In between the bundles are located ground wires which run the length of the cable. The bundles and ground wires are spirally twisted around each other for structural integrity and for a generally round cross-sectional shape. A thin polypropylene filler surrounds this spiral twist. A non-insulated drain wire and an aluminum foil shield are wrapped around the filler. A flexible cable jacket is extruded around the shielded cable. The cable of the present invention unexpectedly renders benefits in high-end audio applications even though it does not operate within the signal path of the system.

Claims

1. A twin-axial power cable for transfer of current having uniform density free from phase delays, comprising:

first and second bundles each having a nonconductive element and at least one insulated electrically conductive wire of a predetermined gauge disposed around said nonconductive element;

said at least one insulated electrically conductive wire of each of said first and second bundles being equal to the other in total cross-sectional area, each at least one insulated electrically conductive wire of said first and second bundles having a radius no greater than one half the skin depth of current travelling through the cable at 60 Hz;

an insulated electrically conductive ground wire of predetermined gauge located along each of said at least one insulated electrically conductive wires of said first and second bundles;

a filler of nonconductive material located around said first and second bundles and said at least one insulated electrically conductive ground wire, said filler for pliably packing said bundles and said at least one insulated electrically conductive ground wire;

an electrically conductive foil shield surrounding said twin-axial bundles, said insulated electrically conductive ground wires, and said filler;

a non-insulated electrically conductive drain wire located within said surrounding foil shield and between said filler and said foil shield, said non-insulated electrically conductive drain wire being in electrical and mechanical contact with said electrically conductive foil shield; and

a nonconductive flexible cable jacket tightly surrounding said foil shield.

2. The power cable of claim 1 wherein said electrically conductive wires of said first and second bundles are helically wrapped around a nonconductive center.

3. The power cable of claim 1 wherein each of said first and second bundles comprises five insulated wires of 18 AWG stranded conductors.

4. The power cable of claim 1 wherein each of said first and second bundles are comprised of five 18 AWG conductors and each of said ground wires are 18 AWG ground wires placed along said first and second bundles, and said bundles and ground wires are twisted spirally among themselves uniformly between one end of the cable to the other end of the cable.

5. The power cable of claim 1 wherein said ground wires are comprised of 18 AWG gauge stranded wire.

6. The power cable of claim 1 wherein said non-insulated electrically conductive drain wire is comprised of an 18 AWG gauge stranded wire.

7. The power cable of claim 1 wherein said nonconductive filler is polypropylene.

8. The power cable of claim 2 wherein said nonconductive center of each of said first and second bundles is polypropylene.

9. The power cable of claim 1 wherein said foil shield is comprised of aluminum on a film comprised of polyester.

10. The power cable of claim 1 wherein said foil shield contains copper.

11. The power cable of claim 1 wherein said cable jacket is comprised of polyvinyl chloride extruded around said foil-wrapped bundles, said ground wires, drain wire, and packing filler providing a generally round cross-section that is pliable, durable and capable of manipulation in all directions.

12. A twin-axial power cable for transfer of current having uniform density free from phase delays, comprising:

first and second bundles each having a nonconductive element and at least one insulated wire strand of a predetermined gauge disposed around said nonconductive element;

said at least one insulated wire strand of each of said first and second bundles being equal to the other in total cross-sectional area, each at least one strand of said first and second bundles having a radius no greater than one half the skin depth of current travelling through the cable at 60 Hz;

a ground wire of predetermined gauge located along each of said at least one insulated wire strand of said first and second bundles;

said first and second bundles of said at least one insulated wire strand and said ground wires twisted spirally about each other along the cable length to present a generally round cross-sectional shape and to minimize electromagnetic interference and inductance;

a filler of nonconductive material located around said first and second bundles and said ground wires, said filler for pliably packing said bundles and said ground wires;

a foil shield wrapped around said twin-axial bundles, ground wires, and filler;

a non-insulated drain wire located within said surrounding foil shield and between said filler and said foil shield, said drain wire being in electrical contact with said foil shield; and

a nonconductive flexible cable jacket tightly surrounding said foil shield.

13. An audiophile power cable for transferring a maximum intended current having uniform density free from phase delays at a predetermined frequency, comprising:

a first bundle having a predetermined number of insulated wire strands each of a predetermined gauge symmetrically and helically wound in one layer around a nonconductive center, the number being determined to accommodate the maximum intended current such that the current carrying capability of each wire times the number of wires is no less than the maximum intended current, the predetermined gauge being determined such that the phase delay corresponding to that gauge is substantially equal to zero for the predetermined frequency;

a second bundle having a predetermined number of insulated wire strands each of a predetermined gauge symmetrically and helically wound in one layer around a nonconductive center, the number being determined to accommodate the maximum intended current such that the current carrying capability of each wire times the number of wires is no less than the maximum intended current, the predetermined gauge being determined such that the phase delay corresponding to that gauge is substantially equal to zero for the predetermined frequency;

said insulated wire strands of each of said first and second bundles being equal to the other in total cross-sectional area; and

at least one ground wire of predetermined gauge located along each of said insulated wire strands of said first and second bundles.