Apparatus and method for multi-point detection in power-over ethernet detection mode
First Claim
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1. A method, in a power-over-Ethernet power source equipment (PSE) device, for multi-point detection of a power device (PD), comprising:
- (a) sequentially applying a series of at least four currents to a link port of the PSE device, wherein each of the at least four currents is applied during a different measurement time interval;
(b) for each of the measurement time intervals, obtaining at least one voltage measurement sample for the link port;
(c) determining a set of voltage differences, wherein each voltage difference is the difference between two of the voltage measurement samples; and
(d) determining, based on the voltage difference between voltage measurement samples, whether a valid PD is coupled to the link port of the PSE.
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Abstract
An apparatus and method for multi-point detection in a power source equipment (PSE) device is provided. During multi-point detection, a series of at least four currents is sequentially applied to a link port of the PSE device. Each current is applied during a different measurement interval. A voltage measurement sample is obtained for each of the measurement intervals. A difference in voltage between alternating voltage samples is determined and used by a detection module to determine whether a valid power device is coupled to the link port of the PSE.
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Citations
20 Claims
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1. A method, in a power-over-Ethernet power source equipment (PSE) device, for multi-point detection of a power device (PD), comprising:
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(a) sequentially applying a series of at least four currents to a link port of the PSE device, wherein each of the at least four currents is applied during a different measurement time interval; (b) for each of the measurement time intervals, obtaining at least one voltage measurement sample for the link port; (c) determining a set of voltage differences, wherein each voltage difference is the difference between two of the voltage measurement samples; and (d) determining, based on the voltage difference between voltage measurement samples, whether a valid PD is coupled to the link port of the PSE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, in a power-over-Ethernet power source equipment (PSE) device including a plurality of link ports, for multi-point detection of a plurality of power devices (PDs), comprising:
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(a) sequentially applying a series of at least four currents to the plurality of link ports of the PSE device, wherein each of the at least four currents is applied during a different measurement time interval; and (b) for each link port, (i) for each of the measurement time intervals, obtaining at least one voltage measurement sample for the link port, (ii) determining a set of voltage differences, wherein each voltage difference is the difference between two of the voltage measurement samples, and (iii) determining, based on the set of voltage differences, whether a valid PD is coupled to the link port of the PSE. - View Dependent Claims (12, 13, 14)
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15. An apparatus for multi-point detection of a power device (PD) in power-over-Ethernet detection mode, comprising:
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a current source configured to sequentially apply a series of at least four currents to a link port, wherein each of the at least four currents is applied during a different measurement time interval; a voltage measurement system configured to measure a voltage at the link port; an analog-to-digital converter (ADC) coupled to the voltage measurement system, the ADC configured to sample the measured voltage a periodic intervals; and a detection module configured to obtain at least one voltage sample for each measurement time interval, to determine a set of voltage differences, wherein each voltage difference is the difference between two of the voltage measurement samples, and to determine, based on the set of voltage differences, whether a valid PD is coupled to the link port. - View Dependent Claims (16, 17, 18)
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19. An apparatus for multi-point detection of a plurality of power devices (PDs) in power-over-Ethernet detection mode, comprising:
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a plurality of current sources, each configured to sequentially apply a series of at least four currents to one of a plurality of link ports, wherein each of the at least four currents is applied during a different measurement time interval; a plurality of voltage measurement system, each configured to measure a voltage at one of the plurality of link ports; an analog-to-digital converter (ADC) coupled to each of the plurality of voltage measurement systems, the ADC configured to sample the measured voltage for each link port a periodic intervals; and a detection module configured to, for each link port, obtain at least one voltage sample for each measurement time interval, to determine a set of voltage differences, wherein each voltage difference is the difference between two of the voltage measurement samples, and to determine, based on the set of voltage differences, whether a valid PD is coupled to the link port. - View Dependent Claims (20)
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Specification