Device for compensating high harmonics and/or the power factor of a non linear load connected to an alternative power network

摘要

A non-linear electrical load (18), e.g. a switched power supply, is connected to an a.c. power mains via a signal processing unit (19) having an input from a current sensor (8). The output of the processing unit is fed back to a power stage (3) that generates a correction signal (e(t)) that compensates for higher harmonics and/or power factor. The correction signal is added to the in phase current drawn from the supply (*(L*)).