EPWM control

[mister_e]

Seems you forgot the back EMF diode in your H-Bridge driver.

470 Ohm seems a bit bit high for a gate resistor... if even really needed...

How many amp you need to drive?

Did you also tried with a resistive load?

I'll look the whole thing later, sure i missed something else.

Fortunately, someone else may beat me to the punch

[Asmith]

Thank you mister_e again for your input. I think I might have made some headway on this project. Things I have chaged from last sch:

1. Removed and placed jumpers instead of the 470ohm gate resistors.

2. Place a 25V 470uF elect Capacitor for the 12V on the motor.

3. Placed 1uF 50V Ceramic caps on the 12V power for the driver chips, and across the H-Bridge 12V.

These seem to have cleaned the signals up a lot. I know can run the test code and a have the motor run back and forth forever. The load of each of the 2 motors is 5A each, I use 100uF for each 1A as a rule of thumb that I had forgotten.

The Back emf diodes are included in the mosfets, and I also have TVS to help with these problems. If you have anything else please free to let me know. I will try to keep everyone updated.

Thank you,
Anthony

[mister_e]

yeah but usually those internal diode are just simply too slow...

I think we don't use the same rules of thumbs 1000uF/Amp here... maybe i'm wrong?

When you said.. Place a 25V 470uF elect Capacitor for the 12V on the motor.
you mean in parallel with the motor??? not sure if you really need it. And.. mmm, if it's not a not-polarized type, you may have some problem one day or another... If it's only on the Vdd rails then.. that's ok.

Across the driver i would suggest 10-47uF tantalum + 0.1 uF ceramic.

Enjoy! and great to know it solve most of the problem