Power sourcing equipment having bipolar junction transistor for controlling power supply and supporting AC disconnect-detection function
First Claim
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1. A system for supplying power to a powered device over a communication link, comprising:
- a power supply device having a controller and an output port coupled to the communication link, and a bipolar junction transistor (BJT) controlled by the controller to provide power to the output port.
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Abstract
A power supply system for providing power to a powered device over a communication link includes a power supply device capable of supporting an AC disconnect-detect function. The power supply device has a controller, an output port coupled to the communication link, and a bipolar junction transistor (BJT) controlled by the controller to provide power to the output port. The BJT may be turned off to present a high impedance required to support the AC disconnect-detection function.
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Citations
20 Claims
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1. A system for supplying power to a powered device over a communication link, comprising:
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a power supply device having a controller and an output port coupled to the communication link, and a bipolar junction transistor (BJT) controlled by the controller to provide power to the output port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15)
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11. A Power over Ethernet (PoE) system comprising:
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a Power Source Equipment (PSE) controller for controlling power applied to a Powered Device (PD) via an Ethernet link, the controller being configured for detecting an AC component of a PD signature;
a PSE port connected to the Ethernet link; and
a BJT controlled by the PSE controller to apply power to the PSE port, and configured to support detection of the AC component of the PD signature. - View Dependent Claims (16, 17)
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18. A method of supplying power from a power supply port to a powered device over a communication link, comprising the steps of:
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driving a base of a BJT having an electrode coupled to the power supply port, to control application of power to the power supply port, and increasing impedance of the BJT to support detection of an AC impedance at the power supply port. - View Dependent Claims (19, 20)
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Specification