Patent ID: 8917782
Filing Date: 2014-12-23
Classification: H04B

Abstract:
1. A vehicular power line communication system (PLC) comprising: a master including a pair of twisted wires, whose ends are connected to form a loop shape, the pair of twisted wires configured to serve as a power line and a data communication line, the master further including a modulation portion configured to modulate data to prepare a data modulation signal, the master configured to output a high-frequency signal via the pair of twisted wires to transmit an electric power as well as the data modulation signal; and a slave including an aperture antenna having a loop shape configured to receive the data modulation signal via the pair of twisted wires using an electromagnetic induction connection with an electromagnetic field generated in the pair of twisted wires according to an energization current of the pair of twisted wires, the aperture antenna having a slave-side opening area that faces a master-side opening area provided in between twisted portions in the pair of twisted wires, the slave further including a demodulation portion configured to demodulate the data modulation signal received via the aperture antenna to obtain a demodulated data, the slave further including an error rate monitor portion configured to monitor an error rate of the demodulated data obtained by the demodulation portion, wherein the master further includes a high-frequency power generation portion and a power-supply frequency control portion, the high-frequency power generation portion is configured to generate a high-frequency power for power supply, the slave further includes a power source monitor portion, which is configured to monitor, via the pair of twisted wires, the high-frequency power generated by the high-frequency power generation portion, the power-supply frequency control portion is configured to control a frequency of the high-frequency power to be generated by the high-frequency power generation portion based on the high-frequency power monitored by the power source monitor portion, the pair of twisted wires having the loop shape is provided as a loop coil without a plurality of twisted portions, and the loop coil includes the master-side opening area facing the slave-side opening area of the aperture antenna as an aperture-faced gap in between the pair of twisted wires of the loop coil, the aperture-faced gap is larger than another gap in between the pair of twisted wires of the loop coil.