I wanted to ask something that's been puzzling me for a while.
I'm interested in dc motor controllers of all types, and I've been studying them over the past year while I learn about electronics. One thing I never unerstood is this:
For a single direction controller, a N-channel mosfet needs just +10v at the gates to switch it on and off, this is the same in a H-Bridge with P and N channel mosfets, but in a circuit with 4x N Channel mosfets in the bridge, the voltage has to be +10v OVER source voltage through the gates!
Why does it have to be +10 over the gates, whereas a normal single speed controller just has to be +10v at the gates?
I'm interested in dc motor controllers of all types, and I've been studying them over the past year while I learn about electronics. One thing I never unerstood is this:
For a single direction controller, a N-channel mosfet needs just +10v at the gates to switch it on and off, this is the same in a H-Bridge with P and N channel mosfets, but in a circuit with 4x N Channel mosfets in the bridge, the voltage has to be +10v OVER source voltage through the gates!
Why does it have to be +10 over the gates, whereas a normal single speed controller just has to be +10v at the gates?