3 PWM for 3 phase inventer

for my 3 signals it's oki but the problem is i can't varier the frequence .

i use this lowpass

can you help me to fix it

i found this doc can you explain me this to fix the output frequence in 2khz

dds_calc.xls (8 KB)

DDS can be used to synthesize a sine wave, but you need a PWM scheme, for which
a master clock is needed that's digital, not analog. DDS can still do this but jitter
may be a concern if the DDS isn't running fast enough (ie isn't hardware based).

Can you explain more what you are intending to do?

i want to generate 3 PWM 120 degrees out of phase with arduino mega2560 because i want to control six pluse igbt to control 3 phase motor ( 220v/380v // f=50hz // rpm = 1430 ) and display the frequence in LCD

No, with DDS and details of your waveform generation, I meant!

how I can do it ?

want to generate 3 PWM 120 degrees out of phase with arduino mega2560 because i want to control six pluse igbt to control 3 phase motor ( 220v/380v // f=50hz // rpm = 1430 ) and display the frequence in LCD

i use timer 1 and 2 :
timer 1 (controls pin 12, 11)
timer 2 (controls pin 10, 9)

can you help me to fix the code for my arduino mega 2560 because the problem is the frenquence output

#include "avr/pgmspace.h"
#include "avr/io.h"

// Look Up table of a single sine period divied up into 256 values. Refer to PWM to sine.xls on how the values was calculated
PROGMEM  prog_uchar sine256[]  = {
  127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,176,178,181,184,187,190,192,195,198,200,203,205,208,210,212,215,217,219,221,223,225,227,229,231,233,234,236,238,239,240,
  242,243,244,245,247,248,249,249,250,251,252,252,253,253,253,254,254,254,254,254,254,254,253,253,253,252,252,251,250,249,249,248,247,245,244,243,242,240,239,238,236,234,233,231,229,227,225,223,
  221,219,217,215,212,210,208,205,203,200,198,195,192,190,187,184,181,178,176,173,170,167,164,161,158,155,152,149,146,143,139,136,133,130,127,124,121,118,115,111,108,105,102,99,96,93,90,87,84,81,78,
  76,73,70,67,64,62,59,56,54,51,49,46,44,42,39,37,35,33,31,29,27,25,23,21,20,18,16,15,14,12,11,10,9,7,6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,7,9,10,11,12,14,15,16,18,20,21,23,25,27,29,31,
  33,35,37,39,42,44,46,49,51,54,56,59,62,64,67,70,73,76,78,81,84,87,90,93,96,99,102,105,108,111,115,118,121,124};
  
  
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
int PWM_OUT_1 =11; // PWM output on pin 11
int PWM_OUT_2 =10; // PWM output on pin 10
int PWM_OUT_3 =12; // PWM output on pin 9
int LED_PIN =13; // LED status on pin 13
int TEST_PIN =7; // Scope trigger on pin 7
int POTEN_IN =A0; // Potentiometer on pin 0
int OFFSET_1 =85; // Offset for second-phase
int OFFSET_2 =170; // Offset for third-phase
double dfreq;
const double refclk = 31376.6; // measured
const uint64_t twoTo32 = pow(2, 32); // compute value at startup and use as constant
// variables used inside interrupt service declared as voilatile
volatile uint8_t icnt; // var inside interrupt
volatile uint8_t icnt1; // var inside interrupt
volatile uint8_t c4ms; // counter incremented every 4ms
volatile uint32_t phase_accum; // pahse accumulator
volatile uint32_t tword_m; // dds tuning word m
//******************************************************************
void setup()
{
pinMode(LED_PIN, OUTPUT); // sets the digital pin as output
Serial.begin(115200); // connect to the serial port
Serial.println("DDS Test");

pinMode(TEST_PIN, OUTPUT); // sets the digital pin as output
pinMode(PWM_OUT_1, OUTPUT); // PWM output / frequency output
pinMode(PWM_OUT_2, OUTPUT); // PWM output / frequency output
pinMode(PWM_OUT_3, OUTPUT); // PWM output / frequency output
// Setup the timers
setup_timer1();
setup_timer2();
// disable interrupts to avoid timing distortion
cbi (TIMSK0, TOIE0); // disable Timer0 !!! delay() is now not available
sbi (TIMSK2, TOIE2); // enable Timer2 Interrupt
dfreq = 1000.0; // initial output frequency = 1000.0 Hz
tword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning word
}
//******************************************************************
void loop()
{
if (c4ms > 250) // timer / wait for a full second
{
c4ms = 0;
dfreq = analogRead(POTEN_IN); // read Poti on analog pin 0 to adjust output frequency from 0..1023 Hz
cbi (TIMSK2, TOIE2); // disble Timer2 Interrupt
tword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning word
sbi (TIMSK2, TOIE2); // enable Timer2 Interrupt
Serial.print(dfreq);
Serial.print(" ");
Serial.println(tword_m);
}
}
//******************************************************************
// timer1 setup
// set prscaler to 1, PWM mode to phase correct PWM, 16000000/512 = 31.25kHz clock
void setup_timer1(void)
{
// Timer1 Clock Prescaler to : 1
sbi (TCCR1B, CS10);
cbi (TCCR1B, CS11);
cbi (TCCR1B, CS12);
// Timer0 PWM Mode set to Phase Correct PWM
cbi (TCCR1A, COM1A0); // clear Compare Match
sbi (TCCR1A, COM1A1);
cbi (TCCR1A, COM1B0); // clear Compare Match
sbi (TCCR1A, COM1B1);
sbi (TCCR1A, WGM10); // Mode 1 / Phase Correct PWM
cbi (TCCR1A, WGM11);
cbi (TCCR1B, WGM12);
cbi (TCCR1B, WGM13);
}

//******************************************************************
// timer2 setup
// set prscaler to 1, PWM mode to phase correct PWM, 16000000/512 = 31.25kHz clock
void setup_timer2()
{
// Timer2 Clock Prescaler to : 1
sbi (TCCR2B, CS20);
cbi (TCCR2B, CS21);
cbi (TCCR2B, CS22);
// Timer2 PWM Mode set to Phase Correct PWM
cbi (TCCR2A, COM2A0); // clear Compare Match
sbi (TCCR2A, COM2A1);
sbi (TCCR2A, WGM20); // Mode 1 / Phase Correct PWM
cbi (TCCR2A, WGM21);
cbi (TCCR2B, WGM22);
}
//******************************************************************
// Timer2 Interrupt Service at 31.25kHz = 32us
// this is the timebase REFCLOCK for the DDS generator
// FOUT = (M (REFCLK)) / (2 exp 32)
// runtime : 8 microseconds ( inclusive push and pop)
ISR(TIMER2_OVF_vect)
{
sbi(PORTD, TEST_PIN); // Test / set PORTD,TEST_PIN high to observe timing with a oscope
phase_accum += tword_m; // soft DDS, phase accu with 32 bits
icnt = phase_accum >> 24; // use upper 8 bits for phase accu as frequency information
OCR2A = pgm_read_byte_near(sine256 + icnt); // read value fron ROM sine table and send to PWM DAC
OCR1A = pgm_read_byte_near(sine256 + (uint8_t)(icnt + OFFSET_1));
OCR1B = pgm_read_byte_near(sine256 + (uint8_t)(icnt + OFFSET_2));
if (icnt1++ == 125) // increment variable c4ms every 4 milliseconds
{
c4ms++;
icnt1 = 0;
}
cbi(PORTD, TEST_PIN); // reset PORTD,TEST_PIN
}

Change your post title to 3-Phase AC motor controller

raschemmel:
Change your post title to 3-Phase AC motor controller

ok thanks

What is your power source?

this is my power source

What's the Peak to Peak voltage at the output ?

raschemmel:
What's the Peak to Peak voltage at the output ?

i don't know

Why not ?

raschemmel:
Why not ?

oki can you explain me ?

Example[edit]
To illustrate these concepts, consider a 230 V AC mains supply used in many countries around the world. It is so called because its root mean square value is 230 V. This means that the time-averaged power delivered is equivalent to the power delivered by a DC voltage of 230 V. To determine the peak voltage (amplitude), we can rearrange the above equation to:

Vpeak=sqrt{2} x Vrms

For 230 V AC, the peak voltage (Vpeak) is therefore 230 V x sqrt{2}, which is about 325 V.

The peak-to-peak value (V P-P of the 230 V AC is double that, at about 650 V.

Are you planning to build this or are just trying to write a program ?
You know if you don't have to use an arduino you can buy a single phase 220vac to 3-phase converter.

i'm trying to write a program

MY problem is i can't varing the frequence with pot(A0)
plz help to fix the code

// disable interrupts to avoid timing distortion
cbi (TIMSK0, TOIE0); // disable Timer0 !!! delay() is now not available
sbi (TIMSK2, TOIE2); // enable Timer2 Interrupt
dfreq = 1000.0; // initial output frequency = 1000.0 Hz
tword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning word
}
//******************************************************************
void loop()
{
if (c4ms > 250) // timer / wait for a full second
{
c4ms = 0;
dfreq = analogRead(POTEN_IN); // read Poti on analog pin 0 to adjust output frequency from 0..1023 Hz
cbi (TIMSK2, TOIE2); // disble Timer2 Interrupt
tword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning word
sbi (TIMSK2, TOIE2); // enable Timer2 Interrupt
Serial.print(dfreq);
Serial.print(" ");
Serial.println(tword_m);
}
}

can't anyone help me ?

i have a projet and i don't have much time

Well perhaps you could give us the basic facts - the datasheet for the motor and
IGBT 3-phase bridge, the range of frequencies you want, the frequency
resolution, what PWM frequency(s).

As I said if you want a programmable frequency generator then DDS is probably
the way to go - use a timer interrupt to update the DDS and the output phase as
the main control loop. At its heart DDS is just

volatile long phase = 0L ;
volatile long frequency = 0L ;

ISR (TIMER2_OVF_vect)
{
  phase += frequency ;
  int top_phase = phase >> 24 ;   // truncate to 8 bits
  int phase_u = sinetab [0xFF & top_phase] ;
  int phase_v= sinetab [0xFF & (top_phase+85)] ;
  int phase_w = sinetab [0xFF & (top_phase+171)] ;
  ...
}