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Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
My ZVS is dead again.
Tried replacing zeners, diodes, and I also replaced the capacitor as it was bulging, When I turn it on it's OK, but when I connect a load/flyback to it, it short my PSU? Right MOSFET gets hot.
This happened a few weeks ago :(
I checked the output voltage on my MM, and it's 24v AC from a small 65w transformer. Input from the transformer is 22v.
So why does the ZVS give out voltage, but when I put a flyback there it shorts?
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Im not fully understand because im a hands on person...aka i require it in my hands to see whats wrong. If you have a DMM with a continuity test, use that... Remove both mosfets. probe pin 1 and 3, then 2 and 3. if at anytime the meter goes beeeeeep, it means your mosfet is fried. Seeing you have one getting hot, i see that as a possibility. not 100%.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Platinum wrote ...
But last time the circuit broke the right MOSFETY got hot, I fixed that by removing the Fet'sand putting them back in!
I used a diode tester, and the MOSFET's didn't conduct. If I remember it will conduct from the gate. Very annoying :(
if you have the mosfet removed and your seeing conducting between gate to 3 its likely because it has an avalanche diode...I would do as stated above, try an ohm meter...see what you get... 1-2, 1-3, and 2-3.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Grenadier wrote ...
Use an ohmmeter. If you measure less than 500 ohms between anything the fet's fried.
The MOSFET that gets hot measures 1-3 from gate to source, and if I do this with the other MOSFET it measures something like 1000~ This is using a diode test.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
All I care about is good postage, anyway those MOSFET's are 1.47 that OK I suppose, what is the max current 25A and the 250n is 30A, so I suppose they are OK.
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ZVS dead.
