Current imbalance compensation for magnetics in a wired data telecommunications network
First Claim
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1. A method for compensating for an effective current imbalance in a pair of conductors carrying common mode electrical power, the conductors coupled to power sourcing equipment (PSE) and a powered device (PD) via a first magnetic device and a second magnetic device, the first and second magnetic devices each having a primary and secondary winding, the method comprising:
- sending a signal between the PSE and the PD;
detecting an effective current imbalance between the PSE and the PD from the signal; and
applying a direct current bias at a desired point between the PSE and the PD in response to the detected current imbalance, the direct current bias having a magnitude and direction to compensate for the effective current imbalance;
wherein a receiver circuit is coupled to the pair of conductors carrying the common mode electrical power, the receiver circuit being constructed and arranged to receive the signal between the PSE and the PD;
wherein a processor circuit is coupled to the receiver circuit;
wherein detecting the effective current imbalance between the PSE and the PD from the signal includes generating, from the processor circuit, a difference error signal indicating a magnitude of droop present on the first and second magnetic devices based on a comparison between (i) waveform characteristics of the signal, when received by the receiver circuit, and (ii) waveform characteristics of an ideal signal; and
wherein applying the direct current bias at the desired point between the PSE and the PD in response to the detected current imbalance includes injecting current at an node coupled to the pair of conductors in response to the difference error signal.
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Abstract
In a circuit delivering common mode inline power over a pair of conductors imbalance in the current carried by the first and second conductors of the pair of conductors is detected and compensated with a bias current applied to counter the imbalance.
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Citations
20 Claims
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1. A method for compensating for an effective current imbalance in a pair of conductors carrying common mode electrical power, the conductors coupled to power sourcing equipment (PSE) and a powered device (PD) via a first magnetic device and a second magnetic device, the first and second magnetic devices each having a primary and secondary winding, the method comprising:
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sending a signal between the PSE and the PD; detecting an effective current imbalance between the PSE and the PD from the signal; and applying a direct current bias at a desired point between the PSE and the PD in response to the detected current imbalance, the direct current bias having a magnitude and direction to compensate for the effective current imbalance; wherein a receiver circuit is coupled to the pair of conductors carrying the common mode electrical power, the receiver circuit being constructed and arranged to receive the signal between the PSE and the PD; wherein a processor circuit is coupled to the receiver circuit; wherein detecting the effective current imbalance between the PSE and the PD from the signal includes generating, from the processor circuit, a difference error signal indicating a magnitude of droop present on the first and second magnetic devices based on a comparison between (i) waveform characteristics of the signal, when received by the receiver circuit, and (ii) waveform characteristics of an ideal signal; and wherein applying the direct current bias at the desired point between the PSE and the PD in response to the detected current imbalance includes injecting current at an node coupled to the pair of conductors in response to the difference error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system comprising:
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first equipment having a first magnetic device, the first magnetic device having a primary winding and a secondary winding; second equipment having a second magnetic device, the second magnetic device having a primary winding and a secondary winding; at least one pair of conductors carrying common mode electrical power and coupling the secondary windings of the first and second magnetic devices; means for transmitting a test signal in the conductors; means for detecting an effective current imbalance between the first equipment and the second equipment from the test signal, the means for detecting including a receiver circuit and a processor circuit coupled to the receiver circuit; and means for correcting the effective current imbalance at a desired point between the first and second equipment in response to the detected current imbalance; wherein the receiver circuit is coupled to the at least one pair of conductors carrying the common mode electrical power, the receiver circuit being constructed and arranged to receive the test signal between the first equipment and the second equipment; wherein the means for detecting an effective current imbalance between the first equipment and the second equipment from the test signal includes means for generating, from the processor circuit, a difference error signal indicating a magnitude of droop present on the first and second magnetic devices based on a comparison between (i) waveform characteristics of the signal, when received by the receiver circuit, and (ii) waveform characteristics of an ideal signal; and wherein the means for correcting the effective current imbalance at a desired point between the first and second equipment in response to the detected current imbalance includes means for injecting current at an node coupled to the at least one pair of conductors in response to the difference error signal. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A system comprising:
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first equipment having a first magnetic device, the first magnetic device having a primary winding and a secondary winding; second equipment having a second magnetic device, the second magnetic device having a primary winding and a secondary winding; at least one pair of conductors carrying common mode electrical power and coupling the secondary windings of the first and second magnetic devices; circuitry configured to transmit a test signal between the first equipment and the second equipment; circuitry configured to detect an effective current imbalance between the first equipment and the second equipment from the test signal, the circuitry configured to detect the effective current imbalance including a receiver circuit and a processor circuit coupled to the receiver circuit; and circuitry configured to correct the effective current imbalance at a desired point between the first and second equipment in response to the detected current imbalance; wherein the receiver circuit is coupled to the at least one pair of conductors carrying the common mode electrical power, the receiver circuit being constructed and arranged to receive the test signal between the first equipment and the second equipment; wherein the circuitry configured to detect an effective current imbalance between the first equipment and the second equipment from the test signal includes circuitry configured to generate, from the processor circuit, a difference error signal indicating a magnitude of droop present on the first and second magnetic devices based on a comparison between (i) waveform characteristics of the signal, when received by the receiver circuit, and (ii) waveform characteristics of an ideal signal; and wherein the circuitry configured to correct the effective current imbalance at a desired point between the first and second equipment in response to the detected current imbalance includes circuitry configured to inject current at an node coupled to the at least one pair of conductors in response to the difference error signal.
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Specification