Texas Instruments Corporation

David N Abramson

Jean Picard

Karl H Jacobs

Disclosed examples include redundant Power over Ethernet (PoE) systems, powered device (PD) controllers and methods in which a first PD controller sends a signal to indicate to the other PD controllers that the first PD controller is powered, and a second PD controller newly connected or reconnected to a corresponding power sourcing equipment (PSE) refrains from turning off a shared DC-DC converter, and the second PD controller waits to allow an inrush current delay of the corresponding PSE to complete before allowing current flow between the DC-DC converter and the corresponding PSE, and the second PD controller selectively provides a signal to request an application circuit powered by the DC-DC converter to temporarily reduce its power consumption below a predetermined value if the corresponding PSE is configured to provide no more than the predetermined value of power.

Turn on method without power interruption for redundant power over ethernet systems

Turn on method without power interruption redundant power over Ethernet systems

In a Power over Ethernet (PoE) system, a Powered Device (PD) having circuitry to measure the load current from a Power Sourcing Equipment (PSE) in the PD. Circuitry compares the measured load current with a first threshold. Circuitry automatically generates load pulses for signaling the PSE, that power to the PD should be maintained.

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Hooksett, NH, United States of America

David N Abramson