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.
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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.
73 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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; 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. - View Dependent Claims (14, 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; 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.
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Specification