Hi,
I wonder if we need a diode if the current through the motor is supported by NPN transistors.
My design is one input from sensor, and the other input from controller. Two voltages go into comparator opamp, and the resulting voltage goes to output stages. In the output stages, I have two NPN transistors for the motor. Since the comparator can generate positive or negative voltage, the motor will be able to run in forward or reverse direction. Yes.. it's totally analog design.
In a simulation with PSpice, it seemed to work fine, so I actually built a circuit and tested. I couldn't find a break down in motor or circuit due to the voltage problem...
I read that DC motor is inductive device so we need protection diodes or capacitors.. but I don't really get why is that. I hope someone there to clarify more about that with some equations, etc...
Please Help!
I wonder if we need a diode if the current through the motor is supported by NPN transistors.
My design is one input from sensor, and the other input from controller. Two voltages go into comparator opamp, and the resulting voltage goes to output stages. In the output stages, I have two NPN transistors for the motor. Since the comparator can generate positive or negative voltage, the motor will be able to run in forward or reverse direction. Yes.. it's totally analog design.
In a simulation with PSpice, it seemed to work fine, so I actually built a circuit and tested. I couldn't find a break down in motor or circuit due to the voltage problem...
I read that DC motor is inductive device so we need protection diodes or capacitors.. but I don't really get why is that. I hope someone there to clarify more about that with some equations, etc...
Please Help!