Patent ID: 8064179

Claim:
A powered device comprising: an interface responsive to a powered network; a transformer circuit including first and second terminals; and an integrated circuit coupled to the interface to receive a power supply and data from the powered network, the integrated circuit comprising: positive and negative power supply terminals, the positive power supply terminal coupled to the first terminal of the transformer circuit; a power rectification device including first and second inputs coupled to the interface to receive the power supply and configured to generate a rectified power supply related to the power supply and to provide the rectified power supply to the positive and negative power supply terminals; a switching regulator to selectively provide the rectified power supply to associated load circuitry; an over-voltage protection circuit coupled between the positive and negative power supply terminals, the over-voltage protection circuit configured to detect an over-voltage condition; a power over Ethernet (PoE) controller configured to control the switching regulator to provide the power supply to the associated load circuitry when the rectified power supply is within an operating range and to provide a shut down signal to deactivate the switching regulator when the over-voltage condition is detected; and a power loss detector coupled to the first and second inputs of the power rectification device and configured to provide a power level indication signal to the PoE controller when a voltage potential between the first and second inputs falls below a first threshold or exceeds a second threshold.