Controlling a buck converter

[mtronics]

Im using a buck converter as a means of operating a Photovoltaic cell at its MPP. I got a buck chip part no 727-5188. I'll be using a pxi chassis as the DAQ. im just wondering has anyone any suggestions as to what the program should be like? im thinking set duty cycle-read v*i- pnew- p_new>p_old-yes then increase duty cycle- no then decrease duty cycle? will i also need pwm to controll the duty cycle?

[PHarris]

Hello mtronics,

I'm afraid your query is too vague at present for me to provide any useful advice for your application. What DAQ cards were you intending to use within the PXI chassis? What data will you be acquiring, what analysis needs to be performed within your program and what type of data will you need to output from the PXI back to your hardware? You mentioned pwm, this can be performed by a DIO card by the use of counters, however any change to duty cycle will require a temporary stop and restart of the DAQmx task. This is demonstrated in the example here.

Kind Regards,