Hello everyone.
I was hoping I could get an opinion on how I have set up a CNC breakout board for the Stepstick series of drivers. In the top left corner, there is a mosfet which will be used to control motor speed via PWM. J1 is a 36V power input, J2 is the connector for the motor and JP10 is the PWM signal input. What I am worried about is stray high voltage spikes from the motor feeding back into the rest of the circuit and exceeding the max voltage of the motor drivers. Diode 1N4004, IMO, doesn`t seem like it would be enough to protect the rest of the circuit from the motor. I was thinking that I should perhaps add a diode between the J1+ and J2+ to allow current to flow ONLY towards the motor. Another problem I am worried about would be the 3 capacitors (C1, C2 and C3) smoothing out the voltage supplied to the motor and negating the whole purpose of the PWM. Short of buying a completely separate power supply, I'm not sure what I could do. What do you guys think?
I was hoping I could get an opinion on how I have set up a CNC breakout board for the Stepstick series of drivers. In the top left corner, there is a mosfet which will be used to control motor speed via PWM. J1 is a 36V power input, J2 is the connector for the motor and JP10 is the PWM signal input. What I am worried about is stray high voltage spikes from the motor feeding back into the rest of the circuit and exceeding the max voltage of the motor drivers. Diode 1N4004, IMO, doesn`t seem like it would be enough to protect the rest of the circuit from the motor. I was thinking that I should perhaps add a diode between the J1+ and J2+ to allow current to flow ONLY towards the motor. Another problem I am worried about would be the 3 capacitors (C1, C2 and C3) smoothing out the voltage supplied to the motor and negating the whole purpose of the PWM. Short of buying a completely separate power supply, I'm not sure what I could do. What do you guys think?