High side switch protection for power over coaxial cable systems

Patent metadata

Field	Value
Publication number	US-10622803-B2
Application number	US-201715678752-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 16, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A system having a load device coupled to an output of an electronic control unit (ECU) via a coaxial cable, and the ECU is disclosed. The ECU has a power supply configured to provide power for the load device, a power over coaxial cable (PoC) filter coupled to the output, a high side switch (HSS) coupled to the power supply and to the PoC filter via an HSS output line, and a diode disposed in the HSS output line and configured to substantially eliminate current flow from the output towards the HSS, while allowing current to flow from the HSS towards the load device from the HSS.

First claim

What is claimed is:

1. A system, comprising:
a load device coupled to an output of an electronic control unit (ECU) via a coaxial cable; and
the ECU, comprising:
a power supply configured to provide power for the load device;
a power over coaxial cable (PoC) filter coupled to the output;
a high side switch (HSS) coupled to the power supply and to the PoC filter via an HSS output line; and
a diode disposed in the HSS output line and configured to substantially eliminate current flow from the output towards the HSS, while allowing current to flow from the HSS towards the load device from the HSS.

2. The system of claim 1 , wherein the load device is a camera.

3. The system of claim 1 , wherein the ECU is a portion of an automobile system.

4. The system of claim 1 , wherein the power supply is a switched mode power supply.

5. The system of claim 1 , wherein the HSS comprises a plurality of field effect transistors.

6. The system of claim 5 , wherein each of the plurality of field effect transistors is configured to connect and disconnect power from the power supply to a separate load device of a plurality of load devices.

7. The system of claim 1 , wherein the coaxial cable provides power to the load device while also providing load device data to the ECU.

8. The system of claim 7 , wherein the ECU is configured to process, at least in part, the load device data received from the load device.

9. A method, comprising:
configuring an electrical control unit (ECU) to include a diode positioned between a high side switch (HSS) and a load device;
providing power to the load device from the ECU;
detecting a short-to-battery event; and
using the diode to prevent current flow to the HSS from a position of the short-to-battery event.

10. The method of claim 9 , wherein the load device is a camera.

11. The method of claim 9 , wherein the ECU is a portion of an automobile system.

12. The method of claim 9 , wherein the power supply is a switched mode power supply.

13. The method of claim 9 , wherein the HSS comprises a plurality of field effect transistors.

14. The method of claim 13 , wherein each of the plurality of field effect transistors is configured to connect and disconnect power from the power supply to a separate load device of a plurality of load devices.

15. The method of claim 9 , wherein the coaxial cable provides power to the load device while also providing load device data to the ECU.

16. The method of claim 15 , wherein the ECU is configured to process, at least in part, the load device data received from the load device.

Assignees

• Connaught Electronics Ltd

Inventors

• Dragoi Beniamin
• Bantiles Sergio

Classifications

• H02H7/20

  for electronic equipment (for converters H02H7/10; for electric measuring instruments G01R1/36; for DC voltage or current semiconductor regulators G05F1/569; for amplifiers H03F1/52; for electronic switching circuits H03K17/08) · CPC title

• H02H3/18

  responsive to reversal of direct current · CPC title

• G07C5/0808

  Diagnosing performance data (testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005) · CPC title

• G01R31/025

  Physics · mapped topic

• H02H3/16 Primary

  responsive to fault current to earth, frame or mass (with balanced or differential arrangement H02H3/26 {; monitoring earth connection H02H5/105}) · CPC title