Network devices for separating power and data signals
First Claim
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1. A network device comprising:
- a transformer with a primary winding and a secondary winding, wherein the primary winding is coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module;
an inductance boost circuit coupled to the secondary winding and operable to increase the impedance of the primary winding; and
the inductance boost circuit senses the current through the secondary winding and applies a gain factor to increase the impedance at the primary winding.
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Abstract
Embodiments disclosed herein provide a network device comprises a transformer with a primary winding and a secondary winding. The primary winding is coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module. An inductance boost circuit is coupled to the secondary winding and operable to increase the impedance of the primary winding. In other embodiments, a network device comprises an autotransformer coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module. An electronic load coupled in parallel between the autotransformer and the PHY layer module.
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Citations
25 Claims
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1. A network device comprising:
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a transformer with a primary winding and a secondary winding, wherein the primary winding is coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module; an inductance boost circuit coupled to the secondary winding and operable to increase the impedance of the primary winding; and the inductance boost circuit senses the current through the secondary winding and applies a gain factor to increase the impedance at the primary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A network device comprising:
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an autotransformer coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module; and an electronic load circuit coupled in parallel between the autotransformer and the PHY layer module; the electronic load circuit is operable to provide common-mode output voltage control and a current source to the PHY layer module. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method comprising:
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coupling an inductance boost circuit coupled to a secondary winding of a transformer, wherein a primary winding of the transformer is operable to receive input signals from a network connector and supply data signals to a physical layer (PHY) module, and the inductance boost circuit is configured to stop functioning during an over-voltage event due to high currents saturation of the transformer; and configuring the inductance boost circuit to sense the current through the secondary winding and apply a gain factor to increase the impedance at the primary winding. - View Dependent Claims (22, 23, 24, 25)
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Specification