Powered device

摘要

A powered device is electronically connected to power sourcing equipment (PSE), to receive voltage signals from the PSE. The powered device comprises a rectifier unit, a recognition unit, a control unit, a converter and a powered circuit. The recognition unit identifies that the PSE is an Ethernet PSE or a DC PSE. The control unit controls whether the control unit output a negative voltage signal output by the rectifier unit, according to a positive voltage signal output by the rectifier unit and a identified result output by the recognition unit. The converter converts the negative voltage signal and the positive voltage signal to a working voltage of the powered circuit, to drive the powered circuit. To feed power by a single interface and identify that the PSE is the Ethernet PSE or the DC PSE, according to a simple circuit architecture.

主权项

1. A powered device, electronically connected to a power sourcing equipment, the power sourcing equipment outputting voltage signals to the powered device, the powered device comprising:
a powered circuit; a rectifier unit, electronically connected to the power sourcing equipment (PSE), the rectifier unit receiving the voltage signals from the PSE and outputting a positive voltage signal and a negative voltage signal by rectifying the voltage signals; a recognition unit, electronically connected to the rectifier unit, the recognition unit identifying whether the PSE is an Ethernet PSE or a direct current (DC) PSE, outputting a recognition voltage signal, and outputting an auxiliary power signal in response to the PSE being the DC PSE; a control unit, electronically connected to the rectifier unit and the recognition unit, the control unit controlling whether the rectifier unit outputs the negative voltage signal according to the recognition voltage signal and the positive voltage signal outputted by the rectifier unit; and a converter electronically connected to the rectifier unit, the recognition unit, the control unit, and the powered circuit, in response to the PSE being the Ethernet PSE, the converter converting the positive voltage signal outputted by the rectifier unit and the negative voltage signal outputted by the control unit to an appropriate voltage to drive the powered circuit; wherein in response to the PSE being the DC PSE, the recognition unit outputs the auxiliary power signal to drive the converter and the converter converts the positive voltage signal outputted by the rectifier unit and the negative voltage signal outputted by the control unit to an appropriate voltage to drive the powered circuit.