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Post by Deleted on Aug 31, 2008 3:26:27 GMT -8
Dear all, nowadays I develop a design that controls speed of 220Vac universal motor, the control basically depends on rectifying the mains voltage using a full wave bridge, then applying the rectified voltage to the motor and switch it using IRF740 "n-channel CMOS" in a PWM fashion to control the speed, despite of connecting a Free Wheeling Diode across the MOTOR, the CMOS get destroyed many times!! How to overcome this problem? Also, how to smooth current of the motor as I use 7KHz chopping frequency and the mains of 50Hz..
Thanx a lot ...SHENDY
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Post by Gary Lecomte on Aug 31, 2008 4:50:34 GMT -8
We Need to see Your Schematic, Before we can help you.
Gary
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Post by Deleted on Aug 31, 2008 6:04:36 GMT -8
how to attach a picture file ?
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Post by Gary Lecomte on Aug 31, 2008 9:04:46 GMT -8
Easiest Way, is Email it to me!
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Deleted
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Post by Deleted on Aug 31, 2008 22:59:20 GMT -8
Dear sir, ur mail is hidden!!!
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Post by Gary Lecomte on Sept 1, 2008 7:28:18 GMT -8
Dear sir, ur mail is hidden!!! I Don't Think so? If you Click on my Name it should show it.. But anyway, it is "chemelec@hotmail.com" And PLEASE Put an Appropriate "Subject Line" in your email to me. Take care.....Gary
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