Power unit and power cable for mobile communication base station

Patent metadata

Field	Value
Publication number	US-2022208417-A1
Application number	US-202017602591-A
Country	US
Kind code	A1
Filing date	May 20, 2020
Priority date	May 19, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

The present disclosure relates to a power unit and a power cable for a mobile communication base station, which have sufficiently low inductance and thus minimize voltage oscillation regardless of a change of the amount of power transmitted when communication load of a mobile communication base station increases, thereby providing stable communication services, and which enhance workability of connection to a remote radio unit (RRU) at a base station.

First claim

1 . A power unit comprising:
an inner conductor including a plurality of conductive strands; an inner insulating layer configured to insulate the inner conductor; an outer conductor including a plurality of conductive strands formed in multiple layers outside the inner insulating layer and wound spirally in a direction; and an outer insulating layer configured to insulate the outer conductor, wherein the inner conductor and the outer conductor are formed coaxially to be used as a pair of conductors for supplying direct-current (DC) power, and a ratio between the sum of areas of the strands of the inner conductor and the sum of areas of the strands of the outer conductor is 0.625:1.6.

2 . The power unit of claim 1 , wherein the power unit is connected to a remote radio unit (RRU) deployed on the tower so as to supply power from a power supply unit (PSU) on the ground to the RRU in a base station system employing a remote radio head (RRH).

3 . The power unit of claim 1 , wherein the inner conductor of the power unit comprises a multiply twisted conductor manufactured by twisting a plurality of strands to form first twisted strands with a first twist pitch and twisting a plurality of first twisted strands to form second twisted strands with a second twist pitch.

4 . The power unit of claim 3 , wherein the multiply twisted conductor comprises a center first twisted strand and first twisted strands arranged around the center first twisted strand and twisted in a direction opposite to a direction in which the center first twisted strand is twisted,
wherein a direction in which the first twisted strands are helically bound is the same as the direction in which the center first twisted strand is twisted.

5 . The power unit of claim 4 , wherein the first twist pitch of the first twisted strands of the power unit is less than the second twist pitch of the multiply twisted conductor.

6 . The power unit of claim 3 , wherein strands constituting the first twisted strands of the power unit have a diameter of 31 AWG to 33 AWG, wherein each of the first twisted strands includes thirty to fifty strands.

7 . The power unit of claim 6 , wherein the multiply twisted conductor has a (1+N) structure in which a center first twisted strand is arranged at a center and N outer center strands are arranged around the center first twisted strand and thus has an outer diameter of 5 AWG to 7 AWG, wherein N is 5, 6 or 7.

8 . The power unit of claim 1 , wherein strands constituting the outer conductor has an outer diameter of 31 AWG to 33 AWG, and are formed in one to five layers and wound spirally in the same direction, wherein the sum of areas of the strands of the outer conductor is in a range of 5 AWG to 7 AWG.

9 . The power unit of claim 8 , wherein the outer conductor is formed by stacking a plurality of conductive strands while being wound spirally in one direction, wherein spiral-winding pitches of the layers of the outer conductor decrease from inside to outside so as to prevent the strands of the layers from being loosen.

10 . The power unit of claim 8 , wherein the direction in which the outer conductor is wound spirally is opposite to the direction in which the multiply twisted conductor is helically bound.

11 . The power unit of claim 1 , wherein a ratio between the sum of areas of the strands of the inner conductor and the sum of areas of the strands of the outer conductor is substantially the same as 1:1.

12 . The power unit of claim 1 , wherein the inner conductor is used as a positive electrode of a direct-current (DC) voltage source, and the outer conductor is used as a negative electrode of the DC voltage source.

13 . The power unit of claim 3 , wherein a space factor of the strands of the inner conductor relative to an inner space of the inner insulating layer is 60% or more.

14 . A power cable comprising:
a plurality of power units of claim 1 ; and a cable jacket covering the plurality of power units.

15 . The power cable of claim 14 , wherein the power cable supplies power to a remote radio unit (RRU) deployed on the tower from a power supply unit (PSU) on the ground in a base station system employing a remote radio head (RRH).

16 . The power cable of claim 15 , wherein the power cable is connected to a terminal box from the PSU and is split into the plurality of power units through the terminal box to be connected to a plurality of RRUs.

17 . The power cable of claim 14 , further comprising at least one interposition unit.

18 . The power cable of claim 14 , further comprising a communication unit including at least one twisted pair of conductor lines insulated with an insulating layer.

19 . The power cable of claim 14 , further comprising an optical unit including at least one optical fiber.

20 . The power cable of claim 14 , further comprising at least one ripcord included in the cable jacket.

21 . (canceled)

22 . (canceled)

Assignees

• Ls Cable & System Ltd

Inventors

• Baeck Jong Seb

Classifications

• H01B9/005 Primary

  including optical transmission elements · CPC title

• H01B9/024

  composed of braided metal wire · CPC title

• H01B9/003 Primary

  including electrical control or communication wires · CPC title

• H01B9/008

  for overhead application · CPC title