VFD ?

Knowledgeable Ones:

I have a question regarding the inards of a variable frequency drive which I
hope you can help me with.

I understand a VFD rectifies line voltage to DC then inverts it at the
required frequency. My question is how it then inverts the DC. Is this a
chopped voltage like a pulse width modulation to build the AC wave form? Or
does it generate varying DC levels? I would suspect the former but do not
know.

TIA.

Hugh Currin
Klamath Falls, OR