Versa Drives can supply drives with Power
Factor Control (PFC) front end for
applications that require strict adherence to
European Union norms (EN 61000-3-2) for
domestic use.
These drives can operate from universal
power supply of 110/200V single phase. An
offline equipment such as a VFD which
employs a rectifier-capacitor front end draws
current in narrow pulses (bottom left figure) at
the peak of the input voltage waveform. This
results in the equipment having a low power
factor, and correspondingly high harmonic
currents which do not do any useful work. The
low power factor results in high rms line
current and the mains supply is not fully
utilized.
Active PFC with boost topology is compact
and corrects the power factor to near unity.
Versa Drives with active boost PFC front end
have several advantages
The figures shown here were taken from the
different models of Versa Drives. On the left
are for a drive without PFC and the figures on
the right for a drive with PFC. Note the near
vanishing of harmonics and the smooth
current wave shape in the drive with PFC front
end.
In the picture is an open frame drive that has
PFC with Class-B filter for meeting strigent
EMI/EMC norms.
Factor Control (PFC) front end for
applications that require strict adherence to
European Union norms (EN 61000-3-2) for
domestic use.
These drives can operate from universal
power supply of 110/200V single phase. An
offline equipment such as a VFD which
employs a rectifier-capacitor front end draws
current in narrow pulses (bottom left figure) at
the peak of the input voltage waveform. This
results in the equipment having a low power
factor, and correspondingly high harmonic
currents which do not do any useful work. The
low power factor results in high rms line
current and the mains supply is not fully
utilized.
Active PFC with boost topology is compact
and corrects the power factor to near unity.
Versa Drives with active boost PFC front end
have several advantages
 | Harmonics are reduced to negligible | |
| levels and EN 61000-3-2 specs are met | ||
| A single drive + motor combination can | |
| work universally as the boost topology permits the drive to work with 90Vac – 260Vac range | ||
| Power factor is corrected to near unity | |
| and as a result the mains supply can be utilized to its full rating | ||
| The DC bus voltage is now regulated | |
| and hence the motor performance is unaffected by variations in mains voltage |
The figures shown here were taken from the
different models of Versa Drives. On the left
are for a drive without PFC and the figures on
the right for a drive with PFC. Note the near
vanishing of harmonics and the smooth
current wave shape in the drive with PFC front
end.
In the picture is an open frame drive that has
PFC with Class-B filter for meeting strigent
EMI/EMC norms.
Versa Drives with low harmonics
Power Factor Control
