Non-interruptive filtering of transmission line communications

摘要

Systems and methods according to aspects of the subject technology provide non-interruptive filtering of transmission line communications. The non-interruptive filtering may physically isolate, in the frequency domain, independent networks that share a common transmission media, such as mains wires that are used to deliver both alternating current (AC) power and power line communication signals. The isolation provided by the non-interruptive filtering prevents the transmissions from the independent networks from interfering with each other. In one or more implementations, the non-interruptive filtering may be provided by one or more filters that include cores, such as ferrite cores, around which two mains wires, e.g. a mains live wire and a mains neutral wire, can be wound in opposite directions, respectively. Currents traveling on the mains wires through the filter in opposite phases cancel each other out, thereby blocking symmetric power line transmissions, while allowing AC power to pass through.

主权项

1. A power line communication (PLC) network filtering system, comprising:
a first communication device coupled to a common power line via a first plurality of wires and configured to couple a first data signal on a first power line network; a second communication device coupled to the common power line via a second plurality of wires and configured to couple a second data signal on a second power line network; and a first filter coupled between the first communication device and the common power line, wherein the first filter is configured to pass alternating current (AC) power over the common power line to the first communication device and block the second data signal from passing over the common power line to the first communication device, wherein the first filter comprises a toroid-shaped core, a first wire of the first plurality of wires being passed through an orifice of the toroid-shaped core and wound around the toroid-shaped core in a first direction and a second wire of the first plurality of wires being passed through the orifice of the toroid-shaped core and wound around the toroid-shaped core in a second direction that is substantially opposite from the first direction.