three-phase inverter bridge-sine table-pic18f4431

J

jhon90ortiz

New Member
hello. anyone knows how to generate a sine table with 8 bits (0-255) for the three phases, I can not obtner the correct waveform
 
You can use a spread sheet program like Excell to make a table.
Getting the correct wave form from a good table is a problem.
 
I can not obtner the correct waveform
Click to expand...
This can be a problem with filtering after the table. RC filter or LC filters or delay in amplifiers or phase shift or.........
I don't know if he can't make a table or if he can't make a wave form.
 
You don't need a "table of three phases" you just need a table of 1 phase, and then read data from 3 different points in the table.

It helps if the number of samples in the table can be evenly divided by 3.
 
I think I used 1/4 of a sign table and used math to get the other 3/4 of the table. AND did this with 3 pointers to get 3 outputs at the same time.
 
hello, thanks for the replies. I have advanced, I could build the sine table, with 19 points, generating a PWM duty cycle center-aligned with the values ​​obtained from the table but has some distortion, are supposed to be completely symmetrical waves and actually towards the beginning and end of each half cycle (whose values ​​should be equal) have slight differences. Is this common?
 
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