sine wave inverter filter

[israel7732]

I programmed a pic16f876a with a sine table. it is now working.
.Please can any one tell me the actual formula used for the LC output filter

 

[bigdogguru]

Are you using PWM to generate the sine wave? If so are you wanting a low pass filter?

---------- Post added at 16:41 ---------- Previous post was at 16:31 ----------

If this is the case simple two pole RC filter should suffice:

D/A Conversion Using PWM and R-2R Ladders to Generate Sine and DTMF Waveforms

 

[kabiru]

Hi isreal,if you are using pwm technics then you need low pass filter to the carier freq, most of the sine wave inverter i know uses only capacitor and leakeage inductance of the transformer to calculate the cut off frequency but you can follow this link it may help you. also you are wellcome to edaboard forum.
en.wikipedia.org/wiki/Constant_k_filter

 

[bigdogguru]

Here's an extensive list of PDFs and sites, covering virtually all types of active and passive filter design:



You should be able to find the passive filter configuration you wish to implement there.

 

[israel7732]

it is a sinewave inverter am talking about. the filter should be at the output ac voltage.

 

[bigdogguru]

Do you have a rough/general schematic of the inverter you are wishing to implement?

Having a look at it would help in recommending a filter design.

 

[israel7732]

the circuit is simple