I want to control one universal dc motor (vacuum cleaner Motor 220V,8A) with AVR micro and one high power mosfet. So the power part schematic is here:
But the problem is here when input voltage going to near 220V the mosfet is breaking down. So as you can see (top of the photo) I have made one ac to dc converter without a transformer and only with one bridge rectifier and two cap (1th 660 uF2th 330 nF ), could be the problem form miss converting and harmonics in dc voltage which going to MOSFET (not complete DC which have some harmonics)?
I guess some part of this problem came from here!!!
My Mosfet is here:
So what could I do for it's protecting from inrush current which came back form motor solenoids, could I use zener diode in this high power (8A,220V) or there are better way?
Edited: According to its datasheet, does it have not any anti parallel fast diode, and how much protection it would have with this kind diodes?
I changed MOSFET to IRFP460 (20A 500V, 80A pulse drain current) So it's working in voltage below 180V AC (Auto-transformer) but in 220V AC It's Mosfet broken down, SO i guess there is some problem in the source power for drain of Mosfet, i Guess there is no enough DC Voltage, So the cap i used there are 1300 uF, Dose i need to increase it's amount for reaching Better DC voltage for power supply of Mosfet (drain-source)?
Somebody did say, you must use 7 X multiplier of your motor normally current Mosfet , which means i must use 8x7=56 A Mosfet for driving this kind DC motors, So dose it correct, any kind of this rules ?!!!
Thanks a lot.