Power line communication device, power supply circuit with communication function, electric appliance, and control and monitoring system

摘要

To realize a transmission function of power line communication by a further simplified and cost-effective circuit configuration, in a PLC modem installed in an electric appliance such as a household electrical appliance. A semiconductor switching element that is present on an electric circuit connected to a power line is driven by a modulator unit. The modulator unit controls ON/OFF operations of the semiconductor switching element, to thereby cause a communication signal of a modulated rectangular wave to be output to the power line for a prescribed period.

主权项

1. A power line communication device that uses a power line as a signal transmission path, comprising:
a semiconductor switching element that is present on an electric circuit connected to the power line and is used for performing switching in a power supply circuit supplied with an AC voltage from the power line; and a modulator unit that controls ON/OFF operations of the semiconductor switching element in an unoccupied time not being occupied with a power signal from the power supply circuit, to thereby cause a communication signal of a modulated rectangular wave to be output to the power line for a prescribed period.