Controller for power line coding and power line coding method

摘要

A controller provides amplitude modulated power line coding of an output voltage waveform. A transformer has a first winding connected in series with the output. An input mains voltage supply and/or the output voltage are monitored, and the second winding of the transformer is configured in dependence on the monitored mains voltage supply, the monitored output voltage and a target output voltage. This target comprises a voltage which encodes a binary bit of digital information. This provides a feedback approach which enables the transformer to be used to provide an accurate modulation of the binary bit to be encoded.

主权项

1. A controller for providing amplitude modulated power line coding of an output voltage at an output of the controller, which output voltage is derived from a mains input voltage supply and comprises a periodic waveform, comprising:
a transformer having a first winding connected in series between the mains input voltage supply and the output; a sampling and monitoring circuit for sampling and monitoring a voltage of the mains voltage supply before the transformer and/or for sampling and monitoring the output voltage, the sampling and monitoring circuit having a sampling frequency higher than the mains frequency; a switching arrangement for setting the circuit configuration of a second winding of the transformer; a switch controller for controlling the switching arrangement to provide a change in the output voltage in dependence on the monitored voltage or voltages and a target output voltage which comprises a voltage which encodes a binary bit of digital information, such that each half cycle or each full cycle of the output voltage encodes an information bit by means of altering the output voltage.