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The block diagram of a typical variable-frequency drive can be divided into three major sections:
The block diagram below contains the power section of the VFD as three separate sections to indicate the three main functions:
above: The VFD shown as three separate sections: rectifier (where AC is converted to DC); the DC intermediate circuit which contains the capacitor and inductor for filtering. The third section is the DC-to-AC inverter where DC is turned back to three-phase AC.
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