AN ELECTRONIC FILTER

摘要

The present invention relates to an electronic filter (4) between a DC power supply (3) and a data transfer network (1) or the like, the data transfer network (1) utilizing a single pair of conductors (1a, 1b) as a transfer route for both signals and electric power. According to the invention the filter (4) comprises: a current generator (5), for feeding DC power into the load (2) connected to the data transfer network (1) regardless of the size of the load; a low pass filter (6), for limiting the operating frequency of the current generator (5) below the signal frequency; and a dynamics limiter (7) for monitoring the output current (Iout) of the filter (4) and the output voltage (Uout) is kept within the operating range regardless of the size of total load.