Power Quality and electromagnetic compatibility -The ‘simple or not so simple’ ubiquitous power supply input stage -

Power Quality is per se the ac line input voltage quality that in turn is determined by the interaction of the source impedance and the line current. Low frequency line current harmonics up to the 40^th harmonic (2 kHz for 50 Hz systems) and high frequency conducted emissions in the range 150 kHz to 30 MHz are the two categories normally considered for EM compliance. This paper considers the low frequency line current harmonic compliance with EN61000-3-2 for currents up to 16 A per phase.