Operation principle and hardware description 13
2
Operation principle and
hardware description
What this chapter contains
This chapter describes the operation basics and the hardware of the IGBT supply unit
(ACS880-207).
Operation principle
IGBT supply unit rectifies three-phase AC current to direct current for the intermediate DC
link of the drive. The intermediate DC link supplies the inverters that run the motor. There
can be one inverter unit only (single drives) or several inverter units (multidrives)
connected to the intermediate circuit.
The
filter is an essential part of the IGBT supply unit. It suppresses the AC voltage
LCL
distortion and current harmonics. The high AC inductance smooths the line voltage
waveform distorted by the high-frequency switching of the converter. Capacitive
component of the filter effectively filters the high-frequency (over 1 kHz) harmonics.