Patent ID: 9071339
Filing Date: 2015-06-30
Classification: H04B

Abstract:
1. A system for closed-circuit power line communication, comprising: at least a first power line and a second power line connected to at least one electrical device configured to receive a data signal; an auxiliary line connected to the at least one electrical device, and configured to provide a ground connection; at least one transmitter configured to generate first data signals for transmission over the first power line and the second power line, respectively, to the at least one electrical device; and a low-pass common-mode filter connected to the first power line and the second power line, and configured to provide closed-circuit data communication between the transmitter and the at least one electrical device, wherein the low-pass common-mode filter comprises at least one coupling capacitor between the first power line and the second power line such that at least the polarities with respect to ground of the first data signals transmitted over the first power line and the second power line, respectively, are substantially similar, wherein the first data signals carried by the first power line and the second power line, respectively, are asymmetrical with respect to the auxiliary line.