Hello guys, i need help how to control speed and direction rotating for 180 vdc motor with H-Brigde mosfet from Arduino ( PWM ). Thank you.
Look at figure #15 and read on down
http://www.homofaciens.de/technics-base-circuits-h-bridge_en.htm
The zener diodes across the gate and source of the MOSFETs limit the maximum voltage reaching the gate. The circuit driving the two inputs will need to be able to cope with 180V though.regarding this schematic, what the maximal VCC on this diagram? just until 20Vdc?
Sorry sir.. I have read before but i still not understand. If vcc use 180vdc. It is okay if just use zener to limiting the Vgs?I guess he didn't go there and read from #15 down
Thank you for your reply. That optocupler can use PC817 Because i have read datasheet Viso until 5000v.but Vceo just until 80vdc ( specialy on high side )The zener diodes across the gate and source of the MOSFETs limit the maximum voltage reaching the gate. The circuit driving the two inputs will need to be able to cope with 180V though.
However, with a 180V supply, both MOSFETs will be turned on simultaneously while the input is changing and will effectively short circuit the supply during the transistions. You could use a dedicated bridge driver IC which will include circuitry to prevent this shoot-through or a circuit as below which will allow you to control the timing of the four gate signals so you can ensure that the top and bottom MOSFETs are never on at the same time.
Also note that you will need four fast diodes across each MOSFET to catch the back-emf spikes from the motor.
Like AlbertHall said post #11The circuit driving the two inputs will need to be able to cope with 180V though.
Thank you for your explain. So input to R6 and R3 must be connected with 1 pwm pin from MCU , R5 and R4 too connected with other pin PWM MCU. for mosfer i will use IRF630 and IRF 9630.. thats right or you have any suggestion for do this project.Read post #11 the zeners clamp the voltage so the gate it below 20 volts your parts would work if you do it like post #11
You can't pwm all 4 pins at once tho. Seeing this your first I'd use 4 pins and go with post 11
The voltage is ok you mosfet are all good for 200 volts and you don't need even a amp
But gates can't be 180 volts you'll pop them.
I'd find 4 SFH619A or some thing like them to drive the gates
so please help me which schematic diagram for treadmill 180vdc motor. Thank youDraw up what your going to do 180 volt dc done wrong going to make a fire.