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Forums
4hv.org :: Forums :: High Voltage
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So pissed off.

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Sulaiman
Sat Feb 19 2011, 08:23AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
 		If you have 1 kOhm gate resistors how quickly can they charge up the gate capacitance of the trasistors?
I prefer a low voltage supply for the gates with low value resistors.
Arrange for the gate supply voltage to turn on before the main power to reduce transistor failures.
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teravolt
Sat Feb 19 2011, 07:09PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		Hi Inducktion, do you think that your zeners could have been in backwards. If you follow the ZVS circuit to the letter it should work fine. It is just about persevering. Do you have any pictures of your setup?
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haikara
Sat Feb 19 2011, 07:29PM
haikara Registered Member #3599 Joined: Mon Jan 10 2011, 05:50PM
Location:
Posts: 15
Zum Beispiel wrote ...

Inducktion wrote ...

And all I was doing was showing my sister my stuff. Seriously. WHY?
There's your problem. It's a law of nature for projects to work perfectly until you try to show them to someone.

i agree to that even if itssound stupid. it happened to me one time xplaining how tesla works. then when i turned it on, guess what. didnt worked. :/
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Inducktion
Sat Feb 19 2011, 09:00PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
teravolt wrote ...

Hi Inducktion, do you think that your zeners could have been in backwards. If you follow the ZVS circuit to the letter it should work fine. It is just about persevering. Do you have any pictures of your setup?
I made sure the zeners were facing the right way...It worked fine previously, all the way up to like 50 volts....
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quicksilver
Sat Feb 19 2011, 09:36PM
quicksilver Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
 		Frankly when I first made those Mazzlli drivers I chose a lower wattage zener (I'm not too sure what it was but at perhaps
.5 watts) & I think that was a very weak link. I like the idea of not using them at all.

(edit: apologies, I need better glasses)
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teravolt
Sun Feb 20 2011, 04:20AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		just check all of your parts before reasemble. What is the max input voltage 50v seams a bit high. What kind of cap are you using on the primary.
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Inducktion
Sun Feb 20 2011, 05:05AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		a .5 MFD Mica capacitor... A nice one.
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radhoo
Sun Feb 20 2011, 11:31AM
radhoo Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Inducktion wrote ...

And all I was doing was showing my sister my stuff. Seriously. WHY?
Because most of the girls are not interested in HV cheesey
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Arcstarter
Mon Feb 21 2011, 01:13AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		Just use an external gate power supply. I am telling you, it works great tongue. Use around 500 ohms or even less, and 15v gate supply.

You need no zeners, because the voltage on the gate cannot get higher than 15v theoretically. In practice there are some factors such as stray inductance and capacitance that can cause spikes but the gate can handle it. Hell, it is made for +-20v, and you could get alot higher without it breaking over, but the gate would oxidize faster with more voltage.
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Inducktion
Mon Feb 21 2011, 04:28AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		Yeah, I plan on making either this one,
Link2

Which is simple, and works great for induction heating, or

Link2

Which also works better for induction heating, all the way up to 2kw.
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