High ripple is seen in the DC link current even after having a relatively large DC link bulk capacitance of 2000 uF. Below waveform captures show the input DC current from a benchtop DC power supply at 12 V DC link voltage.
Waveforms:
DC-link voltage waveform (300 Hz output fundamental frequency, 3.4 A load current):
From the waveforms, it looks like the ripple current reduces with an increase in switching frequency and fundamental output frequency.
High ripple is seen in the DC link current even after having a relatively large DC link bulk capacitance of
2000 uF. Below waveform captures show the input DC current from a benchtop DC power supply at 12 V DC link voltage.Waveforms:
DC-link voltage waveform (300 Hz output fundamental frequency, 3.4 A load current):
From the waveforms, it looks like the ripple current reduces with an increase in switching frequency and fundamental output frequency.