Power over ethernet controller integrated circuit architecture
First Claim
1. A Power Source Equipment (PSE) controller comprising:
- a current measurement system to measure a current of a powered device (PD);
a voltage measurement system to measure a voltage of the PD;
a temperature measurement system to measure a temperature of the current measurement system; and
a multiplexer coupled to the current measurement system, the voltage measurement system, and the temperature measurement system.
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Accused Products
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
20 Claims
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1. A Power Source Equipment (PSE) controller comprising:
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a current measurement system to measure a current of a powered device (PD);
a voltage measurement system to measure a voltage of the PD;
a temperature measurement system to measure a temperature of the current measurement system; and
a multiplexer coupled to the current measurement system, the voltage measurement system, and the temperature measurement system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A Power Source Equipment (PSE) controller comprising:
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a current detection digital to analog converter (IDAC) coupled to a voltage measurement system to measure a current of a powered device (PD);
a classification module coupled to a current measurement system to measure a voltage of the PD;
a multiplexer coupled to the current measurement system and the voltage measurement system; and
a microcontroller core coupled to the multiplexer. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for a detecting and classifying a Power Device (PD) coupled to a Power Source Equipment (PSE) controller, the method comprising the steps of:
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applying a current to the PD;
measuring a voltage of the PD based upon the current to generate a voltage measurement;
formatting the voltage measurement into a first time slot within a time-division multiplexed data stream;
determining a device signature of the PD based upon the voltage measurement;
applying a voltage to the PD;
measuring a current of the PD based upon the voltage to generate a current measurement;
formatting the current measurement into a second time slot within the time-division multiplexed data stream; and
determining a power classification signature of the PD based upon the current measurement.
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19. The method of step 18, wherein the step of determining a device signature, further comprises:
assigning a valid power device signature to a PD when the signature resistance is from 19 kΩ
to 26.5 kΩ and
the signature capacitance is less than 150 nF.
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20. The method of step 18, determining a power classification signature of the PD further comprises:
assigning a corresponding class code to the PD based upon the classification current.
Specification