Patent ID: 8719596
Filing Date: 2014-05-06
Classification: H02J,Y02E,Y04S

Abstract:
1. An apparatus, which is located at a power supply device, for detecting a remote powered device, the power supply device being coupled to the remote powered device by a cable, the apparatus comprising: a power supply circuit, for providing a power supply to the remote powered device according to a detection result based on a discharging characteristic of a capacitive load circuit of the remote powered device; a control circuit comprising a switch coupled in parallel with a current source, the current source providing a constant first current for charging or discharging the capacitive load circuit of the remote powered device, wherein the capacitive load circuit of the remote powered device provides a first voltage, wherein when the switch is turned on, the switch connected in parallel with the current source is approximately an open circuit; and a detection circuit, for detecting the first voltage of the capacitive load circuit of the remote powered device and thereby outputting the detection result, wherein the detection result indicates whether a capacitance value of the capacitive load circuit meets a designated capacitance standard for the capacitive load circuit.