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Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
My zeners were perfectly fine... 1W 12v, you just mishandled it, i offered to box it in a project box and you said no so you cant complain about it being Flimsy... You were fine with it when you saw the pictures too ¬_¬
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I apologize to you Mads, and Tom, The circuit you built me was perfect. I was whining sorry. And sorry for my behaviour Mads.
Anyway I will not be modding a MOT to make a PSU, now.
My father gave me a 13.8v 5A PSU (CB radio looking PSU) and anyway At 13.8 x 5 = 70~watts I though that was no better than the PSU I have now (65w) so I opened the case, There was a big mains power transformer, a circuit with a 2N3055 a LM317 with a pot to adjust out voltage, so I bypassed all of that circuitry, got the secondary output of the transformer, rectified it, smoothed it with a 50v 2200uF cap (is there any reason to add more smoothing caps?) and I'm not sure what the voltage is, my voltmeter measures 71volts, and a bit of ripple, but my voltmeter measures a 2.6volts on a 1.5v battery, also not sure about current, but combined, I estimate it is about 7a at 50~volts, the arc makes a very loud 50hz hum, due to bad smoothing caps.
I also had a very bad shock off the flyback, because the chicken stick I used was a screwdriver, and because the voltage has gone so high, it jump the gap of about 3" and went through my left arm to right arm to ground.
The ZVS, the diodes get very warm, the MOSFET's no heat, the capacitor in the ZVS, is very very hot, I must add more to get better output too. Will I have to change the diodes?
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Platinum wrote ...
I also had a very bad shock off the flyback, because the chicken stick I used was a screwdriver, and because the voltage has gone so high, it jump the gap of about 3" and went through my left arm to right arm to ground.
BE CAREFUL! if you had more current going in you could have died...
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
You need to be extremely careful when working with voltages and currents this high.
Get an actual chicken stick. A screwdriver is okay to use when you're fiddling around with lower powered stuff, but for a ZVS driver I usually try to use a longer stick, something like a dowel or a PVC pipe.
And, when it arcs, the hum is due to the lowish filter capacitance. If you add more capacitance, the hum will become less noticeable.
Also, regarding the capacitor; If you change it out, or add more, yes the capacitors will get less warm. You're basically spreading the heat out over more capacitors so it's better than just one of them handling all of the work. Plus it's radio frequency so it's even harder on them...
Just watch your resonant frequency. If you add more caps, your frequency will drop.
Registered Member #4118
Joined: Mon Oct 03 2011, 04:50PM
Location: MD
Posts: 140
Alex, in a ZVS driver the voltage across the mosfets reaches pi*Vin. Since his fets are 200v he could go up a little more but it's best to be safe and keep your voltage Vbreakdown/3.5 or 4. Platinum, make a chicken stick from at least half a meter of pvc and use it any time you're handling a HV supply capable of 10ma+.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Thanks, The arc ignites at around 1.7" and can stretch to 4" nearly, and the arc is fiery, I'd love to measure the current of the flyback, and also the real voltage and current of the PSU.
Will the PSU benefit if I add more smoothing caps?
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