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Registered Member #2703
Joined: Sun Feb 28 2010, 06:02PM
Location:
Posts: 18
I built the mini sstc 5 by steve ward and the fets keep exploding it worked fine at first by when i turn the pulse rate higher the spark gets smaller and smaller and then the fets explode and my surge protector died (short circuit) it even did that at 20V. It also killed the fets when the i used a screw as the breakout point. also sometimes if i run it for more than 5 minutes the fets explode and they are not even hot.
specs: secondary: about 400t 30awg primary: 4turns 18awg input power full-wave 120vac 470uf filter cap STP25NM50N MOSFETS the interrupter has 1uf cap not 2.2uf the h-bridge has 0.47uf caps not 0.68uf 0.18ohm gate resistor
Registered Member #2750
Joined: Sun Mar 21 2010, 08:47PM
Location: Poland
Posts: 46
You should try to use circuit like this Shotky diodes block the mosfet parasite diode what usualy are damaged. You should use shotky at 45V and max current similar as mosfet.
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Mini SSTC keeps killing FET's
