CCS/F28M35H52C: F28M35H52C reset problem

Alexandros Paspatis

Part Number: F28M35H52C

Tool/software: Code Composer Studio

Dear members,

i am using an F28M35H52C microcontroller to control a prototype 3-phase inverter. At the moment, the inverter is connected on the DC side to a DC power supply and on the AC side to a resistive load through an LCL filter.

My PWM code is fine and i have verified it up to 280Vdc/60Vac, however when i go to higher voltages (e.g. when i raise my DC power supply voltage to 320V), i lose my CCS connection to the microcontroller (all the memories go: Could not read) and my microcontroller seems to reset ( i can observe this because some relays that are controlled through GPIO outputs open at the time i lose the connection with CCS, means GPIO outputs go from 1 to 0). Is this a reset of the microcontroller?

Is it possible all this comes from EMI/ grounding issues? Has anyone met this again?

Kind regards,

Alex

over 6 years ago

0 Manish Bhardwaj over 6 years ago

TI__Mastermind 43730 points

Alex,

try www.ti.com/.../tiduay6c.pdf section 7.1.1.3

Also there is a cap between the isolated ground planes on the control card, you may consider removing it.

0 Alexandros Paspatis over 6 years ago in reply to Manish Bhardwaj

Intellectual 365 points

Hi Manish,

thanks for your reply.

Since i use the F28M35 with its docking station, do you think the reset comes from the 5V usb to power up the board or from the usb that goes to the control card?

Kind regards,
Alex

0 Alexandros Paspatis over 6 years ago in reply to Alexandros Paspatis

Intellectual 365 points

Hi Manish,

test with the ferrite ring was unsuccessful. I also tried with powering up the docking station from an isolation transformer but the reset persists. Do you have any other advice regarding this issue?

Could this be initiated from my code?

Kind regards,

Alex

0 Manish Bhardwaj over 6 years ago in reply to Alexandros Paspatis

TI__Mastermind 43730 points

Are you testing by running the code just from the docking station , so the power board is not connected at all?

0 Alexandros Paspatis over 6 years ago in reply to Manish Bhardwaj

Intellectual 365 points

Hi Manish,
i have one usb to load the controller and one other to power up the docking board. I have done trials with removing the usb that is used to load the controller (after running the controller) but the docking station is always connected to a 5V plug.

0 Manish Bhardwaj over 6 years ago in reply to Alexandros Paspatis

TI__Mastermind 43730 points

Hmm.. let me pose my question a different way

Do you see reset happening if you dont have high voltages present? i.e. you are just running the code but the HV is not present?

If no HV is present, the issue will only be due to the code..

If the issue only happens with HV present, you will need to look at your biasing and voltage rails and see they are clean as the HV is introduced and switching happens. It could still be in the code as well.

0 Alexandros Paspatis over 6 years ago in reply to Manish Bhardwaj

Intellectual 365 points

Hi Manish, the issue happens only with high voltages. Specifically when Vdc>300V and Vac>70V.
Can you explain me what do you mean by checking the biasing and voltage rails?
If it is coming from the code, should it be something in the parameters settings? I am using the Simulink support package.