Hello guys,
i got the Problem to find the right values for the LC Outputfilter of a H-Bridge...
My H-Bridge delivers a good trilevel PWM Signal.
Specifications are 50Hz Sqaure over 80kHz PWM.
The biggest Problem is to find a suitable Inductor to get a good cutoff Frq.
Which cutoff Frq should i use to get a "good" sinewave, dont have to be a low distortion factor, but should be practiable sinewave, for controlling an AC Rotor!
I thougt about a CLC ρ-filter, and i found some Applications which use mH Inductors. But for my circuit i need up to 10A Peak, and to find those Inductors is impossible for me
The next option would be to wind my own Inductor, but I lost my "how-to-wind-a-powerchoke-in-one-day" book.
Can anybody help me, or give me some tricks to design a suitable Inductor.