公开(公告)号：US20220216712A1

公开(公告)日：2022-07-07

申请号：US17702944

申请日：2022-03-24

Applicant: Cisco Technology, Inc.

Inventor： Xiqun ZHU ,  Sung Kee BAEK ,  Wingo CHEONG ,  Steven Anthony GRANZELLA ,  Joel GOERGEN ,  Charles Calvin BYERS

IPC: H02J7/00

Abstract: In one embodiment, a battery backup unit (BBU) cut-off and recharge circuit includes: a first transistor, a power entry connection connected to a main power supply, where power from the power entry connection flows to application circuits for an electronic device, and the first transistor is positioned between a BBU and the power entry connection, and a microcontroller, where the microcontroller is operative to: detect a loss of power from the main power supply, turn on the first transistor to enable the BBU to discharge through the power entry connection to application circuits, detect a status of charge (SOC) for the BBU, and upon detecting that the SOC is under a predefined threshold, set the BBU cut-off and recharge circuit to a lockdown state by turning off the first transistor.

公开(公告)号：US20210066936A1

公开(公告)日：2021-03-04

申请号：US17097611

申请日：2020-11-13

Applicant: Cisco Technology, Inc.

Inventor： Xiqun ZHU ,  Sung Kee BAEK ,  Wingo CHEONG ,  Steven Anthony GRANZELLA ,  Joel GOERGEN ,  Charles Calvin BYERS

IPC: H02J7/00

Abstract: In one embodiment, a battery backup unit (BBU) cut-off and recharge circuit includes: a first transistor, a power entry connection connected to a main power supply, where power from the power entry connection flows to application circuits for an electronic device, and the first transistor is positioned between a BBU and the power entry connection, and a microcontroller, where the microcontroller is operative to: detect a loss of power from the main power supply, turn on the first transistor to enable the BBU to discharge through the power entry connection to application circuits, detect a status of charge (SOC) for the BBU, and upon detecting that the SOC is under a predefined threshold, set the BBU cut-off and recharge circuit to a lockdown state by turning off the first transistor.

公开(公告)号：US20230122603A1

公开(公告)日：2023-04-20

申请号：US17451520

申请日：2021-10-20

Applicant: Cisco Technology, Inc.

Inventor： Xiqun ZHU ,  Sung K. BAEK

IPC: H02H9/04 ,  H02H3/24 ,  H02H3/22

Abstract: According to an embodiment, a surge protector includes a capacitor, a switch, and a first transistor. The capacitor charges based on an input power to the surge protector. The switch turns on when the capacitor is charged to a charge threshold. The surge protector outputs the input power when the switch is turned on. The first transistor turns on when a voltage of the input power exceeds a first input voltage threshold such that the capacitor discharges to below the charge threshold and such that the switch turns off. The surge protector stops outputting the input power when the switch is turned off.