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Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
I realize this topic has been ever so slightly discussed, mostly with people saying, "use less voltage" or "use a CT" stuff like that, but I would like to get some feedback from you guys as to ways to prevent or at least greatly reduce the chances of mosfet failure while operating a tesla coil. This is of particular interest since after making Steve Wards mini coil, , and having the mosfets fail due to bad signal from the antenna, and then recently replacing the antenna with a triad CT, , and still getting mosfet failure when ever I switch the interrupter to high bps. So then the question is, What would be good ways of reducing or eliminating mosfet failure?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Avi and EastVoltReserch are boath right. I have had the same problem and have spent hundreds. A lot of these guys run fets outside the safe operating area. you could use a chepper fet or a bigger fet wich is going to be my next choise. yuo might try a more stable design like a DRSSTC good luck.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Is it practical to use all the suggestions given so far? Such as using a fast recovery diode like mur860 , and a tvs like or should I use a lower voltage tvs, and What rating zeners on G-S 33v?
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Mosfet failure prevent.
