Engineering Guide CDA3000
3-25
3 Selection of inverter module
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EN
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A
3.2.7 Forming of the
DC-link capaci-
tors
All Voltage inverters have an input current inverter (rectifier) by way of
which the 50/60 Hz AC or three-phase voltage is rectified. The rectified
voltage is stored in the so-called DC-link capacitors. The motor-side
power inverter in the output circuit of the inverter reforms the DC link volt-
age into a new three-phase voltage system, with variable frequency (f)
and voltage (u).
Figure 3.3 Block diagram of a voltage transformer
Mains
Rectifier
DC link
Pulse-controlled inverter (PWR)
PWM
Control and monitoring unit
parallel
serial
6
3-phase
a.c. motor
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