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Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
So...why do you use zenners anymore?
Streamer r: yes it can be used. Firkragg and WaveRider used royer oscillators for high frequency SSTCs I built myself a SSTC based on royer circuitry/ZVS driver, whatever, but at much lower frequency (around 76 kHz).
Registered Member #131
Joined: Fri Feb 10 2006, 09:25PM
Location:
Posts: 185
Dr Desmo wrote ...
Nope, you need an inductor too, roughly 100uH, one out of an old computer PSU should do the trick. Those 1n4007's are going to get pretty warm, and I'm unsure if they are fast enough, you will kill them. I used MUR840's on mine, which are probably overkill? You also need some Zeners to clamp the gates. 15Volt jobbies.
No, its different, I got it off the ZVS driver thread, I was told you need zeners “to clamp the gates†I used what people told me to use.
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
The link is for the original driver. The separate gate supply is a new idea developed on the old forum. They both work very well. Choose what you like.
If the FETs have no built in diode you need some ultrafast diodes across the FETs (more current diodes than uf4007).
Good luck, and we wait some pics from you when is ready.
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
Do a search for the datasheet for the specific part you bought, and it will tell you if the FET has an internal diode or not. Also, try to scavenge a TV for the flyback- there is no reason to pay 30 dollars for it- you can buy a TV from goodwill for less than 20$.
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
I would still use a seperate external diode. Those little internal ones pretty weak, you'll find you'll be spiking and blowing your MOSFET's on a regular basis. Just stick with the original ZVS driver you have, and don't worry about a seperate power supply for your gates, I found this only becomes necessary when you get over about 50V.
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
streamers rule wrote ...
could zvs be used for sstc?
Yes, while I don't recommend doing it with this circuit, it does work and has been done before. See my "Soda Bottle SSTC" topic for my results doing this. I believe if you want to do it the "correct" way, you will need 4 windings vs. 2 used in this ZVS driver. I was lazy so I just used the normal circuit and it worked ok.
I agree with Desmo about the zener diodes. I have run my ZVS up to 100vdc and I never see any problems with not using a seperate supply for the gates. Just keep the resistor values high, so nothing overheats.
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Right ZVS Materials?
