Hy!
I' ve built a circuit to drive a 3 phase BLDC, using a micro controller and gate driver IC (schematic included). I' ve already tested it once, but it turned out that one of my Mosfet was wrong and it created a short between 12 V to GND and it dameged my micro controller. I've replaced the Mosfet, but before I test it I want to be sure that I'm not going to make any mistakes. So when I apply 5V and above to the gates and switching the Mosfets to commutate the BLDC I create a short (incidental), as the coils have very low (0,3 Ohm) resistance. I also have to connect the uC's and the driver's ground, and the driver IC GND to the power supply GND, because it needs to be supplied with 12 V. So the result is that my uC GND is connected to the power supply GND, which I think can damage my uC again, when the motor works. Adding another power supply for driver ic might be good, but I really dont want to use another supply. Could you help me to solve this, or do you think it is safe ?
I' ve built a circuit to drive a 3 phase BLDC, using a micro controller and gate driver IC (schematic included). I' ve already tested it once, but it turned out that one of my Mosfet was wrong and it created a short between 12 V to GND and it dameged my micro controller. I've replaced the Mosfet, but before I test it I want to be sure that I'm not going to make any mistakes. So when I apply 5V and above to the gates and switching the Mosfets to commutate the BLDC I create a short (incidental), as the coils have very low (0,3 Ohm) resistance. I also have to connect the uC's and the driver's ground, and the driver IC GND to the power supply GND, because it needs to be supplied with 12 V. So the result is that my uC GND is connected to the power supply GND, which I think can damage my uC again, when the motor works. Adding another power supply for driver ic might be good, but I really dont want to use another supply. Could you help me to solve this, or do you think it is safe ?