scoe
New Member
Hi!
First i would like to note that i'm not EE but ME so please have patience with me Smile
Ok, i would like to make full h-bridge to drive ~10A motor at 7.2V. I will connect two motors in parallel so it will be around 20A. Problem is that motors can drain around 200A peak.
First, i'm consider to design h-bridge with all n-fet IRFZ46. They already have build in diode which i'm not sure is enough to suppress induced voltage.
I will use uC to create PWM signal and one direction signal. So my h-bridge will have only two inputs. I'll use NOR logic to drive max4420.
For driving Mosfets i have max4420 (i know that they are not quite best choice, but i have it in my drawer so...). I saw somewhere on Net that i need to apply Vin to max4420 slowly, but im not sure why. If that is true, is it enough to use some condenser ?
Also, if i use max4420 do i need to use voltage doubler for upper mosfets to supply enough volts on gate ?
For protecting the uC circuit, do i need to use some kind of optocouplers or is it enough to use those mosfet drivers ? I'm not sure if optocouplers are fast enough.
After some confirmation, i'll draw circuit schematic for further analysis.
Thanks in advance!
Sven
First i would like to note that i'm not EE but ME so please have patience with me Smile
Ok, i would like to make full h-bridge to drive ~10A motor at 7.2V. I will connect two motors in parallel so it will be around 20A. Problem is that motors can drain around 200A peak.
First, i'm consider to design h-bridge with all n-fet IRFZ46. They already have build in diode which i'm not sure is enough to suppress induced voltage.
I will use uC to create PWM signal and one direction signal. So my h-bridge will have only two inputs. I'll use NOR logic to drive max4420.
For driving Mosfets i have max4420 (i know that they are not quite best choice, but i have it in my drawer so...). I saw somewhere on Net that i need to apply Vin to max4420 slowly, but im not sure why. If that is true, is it enough to use some condenser ?
Also, if i use max4420 do i need to use voltage doubler for upper mosfets to supply enough volts on gate ?
For protecting the uC circuit, do i need to use some kind of optocouplers or is it enough to use those mosfet drivers ? I'm not sure if optocouplers are fast enough.
After some confirmation, i'll draw circuit schematic for further analysis.
Thanks in advance!
Sven