Apparatus and method for monitoring for a maintain power signature (MPS) of a powered device (PD) in a power source equipment (PSE) controller
First Claim
1. An apparatus for monitoring for an alternating current (AC) power signature of a powered device (PD) from among a plurality of PDs in a Power Source Equipment (PSE) Controller, comprising:
- a charge pump configured to provide a first signal based upon a first clock; and
a plurality of AC disconnect modules coupled to the charge pump, each of the plurality of AC disconnect modules being coupled to a corresponding PD from among the plurality of PDs,wherein each of the plurality of AC disconnect modules is configured to switch between the first signal and a second signal based upon a corresponding one of a plurality of second clocks to produce a corresponding one of a plurality of third signals, and to apply the corresponding one of the plurality of third signals to the corresponding PD, the plurality of third signals being configured such that only one of the plurality of third signals corresponds to the first signal at a given time; and
a voltage measurement system configured to determine an impedance of the corresponding PD by measuring the corresponding one of the plurality of third signals, the impedance of the respective PD determining the AC power signature for the corresponding PD.
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Abstract
Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required. The PSE controller also monitors for a Maintain Power Signature (MPS). The PSE controller removes power from the PD if the MPS condition is absent for longer than its related time limit. The MPS consists of two components: an AC MPS component and a DC MPS component. The PSE controller may optionally monitor the AC MPS component only, the DC MPS component only or both the AC and the DC MPS components.
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Citations
20 Claims
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1. An apparatus for monitoring for an alternating current (AC) power signature of a powered device (PD) from among a plurality of PDs in a Power Source Equipment (PSE) Controller, comprising:
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a charge pump configured to provide a first signal based upon a first clock; and a plurality of AC disconnect modules coupled to the charge pump, each of the plurality of AC disconnect modules being coupled to a corresponding PD from among the plurality of PDs, wherein each of the plurality of AC disconnect modules is configured to switch between the first signal and a second signal based upon a corresponding one of a plurality of second clocks to produce a corresponding one of a plurality of third signals, and to apply the corresponding one of the plurality of third signals to the corresponding PD, the plurality of third signals being configured such that only one of the plurality of third signals corresponds to the first signal at a given time; and a voltage measurement system configured to determine an impedance of the corresponding PD by measuring the corresponding one of the plurality of third signals, the impedance of the respective PD determining the AC power signature for the corresponding PD. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a Power Source Equipment (PSE) Controller, a method for monitoring for an alternating current (AC) power signature of a powered device (PD) from among a plurality of PDs, comprising:
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generating a first signal based upon a first clock; generating a plurality of third signals by switching between the first signal and a second signal based upon a plurality of second clocks; applying one of the plurality of third signals to a corresponding PD from among the plurality of PDs, the plurality of third signals being configured such that only one of the plurality of third signals corresponds to the first signal at a given time; and determining an impedance of the corresponding PD by measuring a corresponding one of the plurality of third signals, the impedance of the corresponding PD determining the AC power signature for the corresponding PD. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification