Patent ID: 11916374
Assignee: CISCO TECHNOLOGY, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A system comprising:
an alternating current to direct current (AC-DC) conversion circuit coupled to an AC power supply that converts AC power to DC power;
a power transmitter configured to provide power to a current loop;
an isolation circuit coupled between the AC-DC conversion circuit and the power transmitter; and
a power receiver configured to receive the power from the current loop;
wherein the power receiver is configured to, on a periodic basis, disconnect from the current loop to stop pulling power from the current loop for a period of time to enable a safety check to be performed by the power transmitter;
wherein the power transmitter is configured to:
monitor current on the current loop;
determine whether a current level on the current loop passes the safety check within a predetermined time interval since a determination that the current level was not within a safe range; and
control connectivity of the power to the current loop depending on whether the safety check has or has not passed within the predetermined time interval by terminating operation of a pulse control signal to the isolation circuit to provide pulse power from the AC-DC conversion circuit to the current loop.