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[Inverter] Design of passive filter

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by tom911, Mar 16, 2012.

  1. tom911

    tom911 New Member

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    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 ?
     
  2. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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

    Attached Files:

  3. jackal_001

    jackal_001 New Member

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

    Dave New Member

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  5. tom911

    tom911 New Member

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    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
     
  6. alec_t

    alec_t Well-Known Member Most Helpful Member

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    Google for 'filter design tutorial'.
     

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