System, method and apparatus for one-pair power over ethernet in an automotive application

• US 10,112,558 B2
• Filed: 09/08/2014
• Issued: 10/30/2018
• Est. Priority Date: 09/11/2013
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Panguluri, Sesha Thalpasai, Tran, Minh, Yu, James, Diab, Wael William
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Willoughby, Terrence
• Application Number:
  US14/479,938
• Publication Number:
  US 20150076901A1
• Time in Patent Office: 1,513 Days
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00

Abstract

System, method and apparatus for one-pair power over Ethernet in an automotive application. In one embodiment, a power sourcing equipment transmits a forward path current to a powered device via a single conductor pair and receives a return path current from the powered device via a chassis of an automotive vehicle.

Claims

1. A method, comprising:

transmitting, by a power sourcing equipment, a forward path current to a powered device via a single conductor pair, a first portion of the forward path current carried over a first conductor of the single conductor pair and a second portion of the forward path current carried over a second conductor of the single conductor pair, and a return path current from the powered device to the power sourcing equipment carried by a chassis of an automotive vehicle,

wherein the power sourcing equipment is coupled to a battery of the automotive vehicle, the battery connected to the chassis of the automotive vehicle, and the chassis connected to the powered device, and

wherein a difference between a resistance of the chassis and a resistance of the single conductor pair provides a predetermined power loss attributable to a predetermined length of the single conductor pair.

2. The method of claim 1, wherein the battery is a 12V battery.

3. The method of claim 1, wherein the power sourcing equipment is connected to a positive terminal of the battery.

4. The method of claim 1, wherein the power sourcing equipment is connected to the single conductor pair via a transformer.

5. The method of claim 1, wherein the power sourcing equipment is connected to the single conductor pair via an inductor.

6. The method of claim 1, wherein the single conductor pair is a single twisted wire pair.

7. A power sourcing equipment, comprising:

a first port that is configured for coupling to a battery of an automotive vehicle, wherein the battery is connected to a chassis of the automotive vehicle, and the chassis is connected to a powered device;

a second port that is configured for coupling to a single conductor pair; and

control logic that is configured to control a delivery of power to the powered device via the single conductor pair, a first portion of a forward path current carried over a first conductor of the single conductor pair, a second portion of the forward path current carried over a second conductor of the single conductor pair, and a return path current from the powered device to the power sourcing equipment carried by the chassis of the automotive vehicle,

wherein a difference between a resistance of the chassis and a resistance of the single conductor pair provides a predetermined power loss attributable to a predetermined length of the single conductor pair.

8. The power sourcing equipment of claim 7, wherein the battery is a 12V battery.

9. The power sourcing equipment of claim 7, wherein the first port of the power sourcing equipment is coupled to a positive terminal of the battery.

10. The power sourcing equipment of claim 7, wherein the second port is coupled to the single conductor pair via a transformer.

11. The power sourcing equipment of claim 7, wherein the second port is coupled to the single conductor pair via an inductor.

12. The power sourcing equipment of claim 7, wherein the single conductor pair is a single twisted wire pair.

13. A method, comprising:

coupling a first port of a power sourcing equipment to a battery of an automotive vehicle, wherein the battery is connected to a chassis of the automotive vehicle, and the chassis is connected to a powered device;

coupling a second port of the power sourcing equipment to a single conductor pair; and

controlling a delivery of power from the power sourcing equipment to the powered device via the single conductor pair, a first portion of a forward path current carried over a first conductor of the single conductor pair, a second portion of the forward path current carried over a second conductor of the single conductor pair, and a return path current from the powered device to the power sourcing equipment carried by the chassis of the automotive vehicle,

wherein a difference between a resistance of the chassis and a resistance of the single conductor pair provides a predetermined power loss attributable to a predetermined length of the single conductor pair.

14. The method of claim 13, wherein the first port is coupled to a positive terminal of the battery.

15. The method of claim 13, wherein the second port is coupled to the single conductor pair via a transformer.

16. The method of claim 13, wherein the second port is coupled to the single conductor pair via an inductor.

17. The method of claim 13, wherein the single conductor pair is a single twisted wire pair.