Abstract: A method for preventing an excess voltage from appearing at an output of a power over Ethernet controller, the method comprising: sensing that a powered device has been disconnected from a port; enabling a bypass path around a means for unidirectional current flow operatively connected to the port; and disconnecting power to the port responsive to the sensed disconnect, whereby the bypass path enables a discharge path for an output capacitor present across the port. The invention also provides for a circuit having a bypass path around a means for unidirectional current flow, the bypass path being enabled by a control circuit to prevent an excess voltage from appearing at a sensing input of the control circuit. In an exemplary embodiment the bypass path is enabled approximately simultaneously with disconnecting power from the output port.
Type:
Grant
Filed:
January 31, 2005
Date of Patent:
October 9, 2007
Assignee:
PowersDsine, Ltd.-Microsemi Corporation
Inventors:
Shimon Elkayam, Amir Peleg, Nadav Barnea, Dror Korcharz