[Inverter] Design of passive filter

[tom911]

Hello,

I'm currently at the final stage of simple inverter design (a coursework) which consists of PWM, 6 mosfets and 3-phase purely resistive load.

As far as I understood everything to this point I can't really fully understand the harmonics and filtering therefore I will give you my opinion and you could hopefully give me feedback:

- Use a Low pass filter [RLC or RC] (Switching frequency is 21(sampling frequency)*50(fundamental frequency) = 1050Hz) to filter the harmonic content in output waveform.

And a questions:
*Would you be able to provide a really good background reading on basic filter calculations and Harmonics ?

 

[ericgibbs]

hi Tom,
This SMPS Ref manual is a good source of info.

 

[jackal_001]

if u know how to use altium designer or PSpice u can see the harmonics there with fft analysis .

 

[tom911]

Thanks for replays however the issue has not been solved.

The problem with the design is that I've been given an output characteristics only which is 2A/100Vrms/50Hz output. With those values I can't design a RC filter with the knowledge I currently have, the fact that harmonics and filtering have been poorly explained and are my weakest subject in all electrical fields, makes every chapter I read even more confusing.

Would be able to provide with an example of how to solve such design characteristics ?
Should I simulate my design first ?

Thanks,
Tom

 

[alec_t]

Google for 'filter design tutorial'.