Dear colleagues,
Apologize if this is asked twice, used search, didn't find anything related.....
I've been trying to make DC/AC converter. I used CD 4047, LM 358, 2 transistors and then Hexfet Power Mosfet output stage. See attached diagram.
I used center tap transformer from old UPS, which is ~18/18 V primary, and 220v secondary.
Circuit runs ok with 12V, with 150V output. The problem is, I want to run it on 24v to get full 220v output. But mosfet are blown every time when I try to connect to 24v.
I've used snubber resistors, diode , regulator...all sort of stuff..
My thought is in modulation, can I have pulses overlaping, so excessive current flows thorugh mosfet??
Today I will increase snubber capacitor to 100/200/500 mf. And maybe put 2 mosfets per rail. See what happens..
Appreciate if you can suggest possible solution.
Apologize if this is asked twice, used search, didn't find anything related.....
I've been trying to make DC/AC converter. I used CD 4047, LM 358, 2 transistors and then Hexfet Power Mosfet output stage. See attached diagram.
I used center tap transformer from old UPS, which is ~18/18 V primary, and 220v secondary.
Circuit runs ok with 12V, with 150V output. The problem is, I want to run it on 24v to get full 220v output. But mosfet are blown every time when I try to connect to 24v.
I've used snubber resistors, diode , regulator...all sort of stuff..
My thought is in modulation, can I have pulses overlaping, so excessive current flows thorugh mosfet??
Today I will increase snubber capacitor to 100/200/500 mf. And maybe put 2 mosfets per rail. See what happens..
Appreciate if you can suggest possible solution.
Attachments
-
12 KB Views: 121
Last edited: