Dual-mode detection of powered device in power over ethernet system
AssigneeLinear Technology Corporation
InventorsJohn Arthur Stineman, Jr., Jeffrey Lynn Heath
Life of this patent
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Abstract
Novel circuitry and methodology for detecting a Powered Device (PD) in a system for providing power to the PD. PD detection circuitry detects the PD in a first mode by providing detection current to probe the PD, and in a second mode by providing detection voltage to probe the PD. A control circuit determines that the PD is a valid device if the PD is detected both in the first mode and in the second mode.
Claims20
A system for providing power to a powered device (PD), comprising:
- PD detection circuitry for detecting the PD in a first mode by providing detection current to probe the PD, and in a second mode by providing detection voltage to probe the PD, and
- a control circuit for determining that the PD is a valid device if the PD is detected both in the first mode and in the second mode.
A Power Sourcing Equipment (PSE) in a Power over Ethernet (PoE) system, comprising:
- a powered device (PD) detection source for detecting a PD in a force-current mode and a force-voltage mode, and
- a control circuit for validating the PD if the PD is detected in both the force-current mode and the force-voltage mode.
A method of detecting a powered device (PD), comprising the steps of:
- determining a prescribed parameter of the PD in a force-current mode,
- determining the prescribed parameter of the PD in a force-voltage mode, and
- validating the PD if the prescribed parameter of the PD is found to be valid in both the force-current mode and the force-voltage mode.
Dependencies are inferred from the claim text.