公开(公告)号：US20210307147A1

公开(公告)日：2021-09-30

申请号：US16319583

申请日：2017-07-13

申请人： PHILIPS LIGHTING HOLDING B.V.

发明人： George Bradley MILLS

IPC分类号： H05B47/185 ,  H04B3/54 ,  H05B47/165

摘要： A system (and system controller) has powering of, and communication with, a set of fixtures using an AC cable having a power line (e.g. a mains live wire), a reference line (e.g. a mains neutral wire) and a data line. Fixtures are at different positions along the cable, each powered by the local voltage difference between the power line and the reference line. A system controller provides a data signal over the data line, wherein the data signal for a fixture is defined by the local voltage difference between the data signal on the data line and the reference line (or power line). In order to compensate for voltage drops, a compensation circuit adds a voltage offset waveform to the data signal which is dependent on the overall set of positions of the fixtures. This enables an increased number of fixtures and/or reach of the fixtures connected to the system controller.