Search found 11 matches

part of my code..
...
signed int16 error=0; // real error read from ADC
...
signed int16 vout=0;
signed int16 vref=204; //204 in 8 bits for 4V, output at 12V

every 50us following executes
...

but I checked with break point,
from
error=error+5;
// implement digital PID by reading table.
u=u_1+aerror_1=error;
error_2=error_1;
This looks like an error too, most like ...

it looks like I have to run at 50us, 20khz.

I would recomend not running this with interupts.

This is what I would do.

While(!PWM_Timer_Interupt_Flag_Set)
{ PWM_Timer_Interupt_ ...

should be u=u_1+a u=u_1+aIs this your real code or a simplified version of it? Now the index into the three arrays is the same, so you can simplify the calculation by using only a single array instead ...

I have been trying to make a controller for DC/DC converter. and I first try the switching frequency at 40kHz, 25us. I would like the duty cycle can be updated at same frequency, which means only 25us ...

I check the possible value, 0.5 makes no big different at new_dutycycle(0-249). thanks.

Why are you using FLOATING POINT???
Fixed point is MUCH faster. Where speed matters never use floating poi ...

at http://www.ccsinfo.com/forum/viewtopic.php?t=20085

thanks a lot,

have a good day

gun

I am doing a project to using PIC chip to control a dc/dc converter. here is my problem.
when calculation of of new duty cycle involves the PID or other type controller, it employs the floating numb ...

thank you so much for your massage here.it is quite helpful,and I am checking it now.
since the project you mentioned is quite similar with mine. is it possible for you to send me the source code? or ...

I am doing one project for DC/DC converter.40kHz.the following code is a test code for the function feedback and set PWM dutycycle. but I always can't get the good result .could somebody check it for ...

hi, all, I have a question about :18F452 Enhanced PWM mode setup in CCS
is there any built-in function to setup Enhanced PWM mode with two PWM signal output for push pull application? thanks a lot