公开(公告)号：US10680836B1

公开(公告)日：2020-06-09

申请号：US16284400

申请日：2019-02-25

Applicant: Cisco Technology, Inc.

Inventor： Paolo Sironi ,  Sushin Suresan Adackaconam ,  Joel Goergen ,  Roberto Gianella

IPC: H04L12/10 ,  H02M1/32 ,  H01H83/10 ,  H01H83/22

Abstract: An apparatus comprises an Ethernet port including high-side transformers and low-side transformers. High-side current paths supply high-side currents form a high voltage rail to high-side center taps of the high-side transformers. Low-side current paths supply or do not supply low-side currents from a low voltage rail to low-side center taps of the low-side transformers, and convert the low-side currents to sense voltages. A controller configures the low-side current paths to either supply or not supply the low-side currents to the low-side center taps when none of the sense voltages exceed a voltage threshold representative of an overcurrent threshold or when at least one of the sense voltages exceeds the voltage threshold, respectively. A current monitor injects additional current into the low-side current paths only when at least one of the high-side currents exceeds the overcurrent threshold.

公开(公告)号：US11063774B2

公开(公告)日：2021-07-13

申请号：US16861041

申请日：2020-04-28

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Paolo Sironi ,  Sushin Suresan Adackaconam ,  Joel Goergen ,  Roberto Gianella

IPC: H04L12/10 ,  H02M1/32 ,  H01H83/10 ,  H01H83/22

Abstract: An apparatus comprises an Ethernet port including high-side transformers and low-side transformers. High-side current paths supply high-side currents form a high voltage rail to high-side center taps of the high-side transformers. Low-side current paths supply or do not supply low-side currents from a low voltage rail to low-side center taps of the low-side transformers, and convert the low-side currents to sense voltages. A controller configures the low-side current paths to either supply or not supply the low-side currents to the low-side center taps when none of the sense voltages exceed a voltage threshold representative of an overcurrent threshold or when at least one of the sense voltages exceeds the voltage threshold, respectively. A current monitor injects additional current into the low-side current paths only when at least one of the high-side currents exceeds the overcurrent threshold.

公开(公告)号：US20200274725A1

公开(公告)日：2020-08-27

申请号：US16861041

申请日：2020-04-28

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Paolo Sironi ,  Sushin Suresan Adackaconam ,  Joel Goergen ,  Roberto Gianella

IPC: H04L12/10 ,  H01H83/22 ,  H02M1/32 ,  H01H83/10

Abstract: An apparatus comprises an Ethernet port including high-side transformers and low-side transformers. High-side current paths supply high-side currents form a high voltage rail to high-side center taps of the high-side transformers. Low-side current paths supply or do not supply low-side currents from a low voltage rail to low-side center taps of the low-side transformers, and convert the low-side currents to sense voltages. A controller configures the low-side current paths to either supply or not supply the low-side currents to the low-side center taps when none of the sense voltages exceed a voltage threshold representative of an overcurrent threshold or when at least one of the sense voltages exceeds the voltage threshold, respectively. A current monitor injects additional current into the low-side current paths only when at least one of the high-side currents exceeds the overcurrent threshold.