Apparatus and method for classifying a powered device (PD) in a power source equipment (PSE) controller
First Claim
1. In a Power Source Equipment (PSE) Controller, an apparatus for classifying a powered device (PD), the apparatus comprising of:
- a preamplifier configured to receive a differential input voltage from the PD, wherein the preamplifier converts the input differential voltage to a single ended output; and
a classification module to compare the single ended output to a classification reference voltage to produce a classification current, wherein the PSE controller classifies the PD based on the classification current.
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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. During detection, if the PSE finds the PD to be non-compatible, the PSE can prevent the application of power to that PD device, protecting the PD from possible damage.
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Citations
27 Claims
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1. In a Power Source Equipment (PSE) Controller, an apparatus for classifying a powered device (PD), the apparatus comprising of:
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a preamplifier configured to receive a differential input voltage from the PD, wherein the preamplifier converts the input differential voltage to a single ended output; and
a classification module to compare the single ended output to a classification reference voltage to produce a classification current, wherein the PSE controller classifies the PD based on the classification current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A Power over Ethernet (PoE) system, the system comprising of:
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a powered device (PD) configured to output a differential voltage;
a preamplifier to convert the input differential voltage to a single ended output;
a classification module to compare the single ended output to a classification reference voltage to produce a classification current; and
a PSE controller to classify the PD based on the classification current. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for classifying a powered device (PD) in a Power over Ethernet (PoE) system, the method comprises the steps of:
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receiving a differential input voltage from the PD;
converting the differential input voltage to a single ended output;
comparing the single ended output to a classification reference voltage to produce a classification current; and
classifying the PD based on the classification current. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification