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I need to be able to control a drill motor (18v, 50A) with a 5v signal from a development board. I know I can use a MOSFET to control the high voltage, but that would still require a momentary 20V signal going to the gate of the MOSFET (which is higher than the 5v) signal. Someone recommended using a MOSFET Driver, but I'm not sure what that is or how to create one. If someone could give me some more info on how to do this or provide examples I would greatly appreciate it.
And got the following answer:
You don't say what type of control. But if all you want is to turn the motor on or off, then a thyristor will do the trick. Because of the commutator on the motor, the SCR will shut off when the gate current is removed. You can even get sensitive gate SCRs if the current is an issue on the 5V signal. You could also just use a solid state relay or mechanical relay. If you're using the MOSFET for some particular reason and don't have voltage higher than 18, then you could use a DC-DC converter to gain the potential and used a BJT intermediate stage.