TIDM-HV-1PH-DCAC: TIDM-HV-1PH-DCAC

Ramesh Muruganantham

I am adopting this eval board to make a 3 phase inverter. So in the code I added another 2 set of PWM to generate gate signal for other 2 phases and working only with open loop. I use the same interrupt to update other 2 channels of pwm. However In the code - in inline void updateInverterPWM(uint32_t base1, uint32_t base2, float duty) function following code need to be commented to get the PWM signals on all the other channels.

// if(EPWM_getTimeBaseCounterDirection(base1)==0) // make sure the PWM is counting down

// {

If I don't comment I don't get the PWM output in other phases. Could you give more details on this line? why is it necessary? How do we make sure the pwm is updated without missing.

Regards,

Ramesh

over 7 years ago

0 Mark Labbato over 7 years ago

Guru 30330 points

Hi,

The expert best suited to answer your question is out this week. Please expect a response next week. We appreciate your patience.

Regards,
Mark

0 Manish Bhardwaj over 7 years ago in reply to Mark Labbato

TI__Mastermind 43730 points

Ramesh,

That line of code was added to experiment with some ideas, i believe as you started modifying the code for the three phase system , the timing differences are causing the update not to happen.

I will suggest you can remove that if statement without much difference to the final system.

I have also flagged this as something we may want to clean and edit.

Regards
Manish Bhardwaj

0 Ramesh Muruganantham over 7 years ago in reply to Manish Bhardwaj

Expert 1410 points

Thanks Manish. As you mentioned the pwm output is working if the if statement is commented.

Regards,

Ramesh

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TIDM-HV-1PH-DCAC: TIDM-HV-1PH-DCAC