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4hv.org :: Forums :: Tesla Coils
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Low output and mosfets burn

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Unleashed
Thu Jul 19 2012, 01:27PM
Unleashed Registered Member #5171 Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
 		Double post, sorry.
I have a MKT 250v 37uF capacitor, can i use this^?
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zzz_julian_zzz
Thu Jul 19 2012, 02:54PM
zzz_julian_zzz Registered Member #3964 Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
 		37 uf?i think that's too large for the application =/
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Unleashed
Thu Jul 19 2012, 02:55PM
Unleashed Registered Member #5171 Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
 		What ratings should i use?

Capacitance = 10uF
Voltage = ?
type = ? (MKT,MKP etc. )
Thanks.
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Unleashed
Thu Jul 19 2012, 11:07PM
Unleashed Registered Member #5171 Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
 		I have just finished replacing mosfets and redesigning the bridge with much smaller connections.

Here is the photo of the new bridge layout.
Link2
as you can see the wires are much smaller.
Tomorrow i will insert the snubbing cap as well.

Just one question.
At my shop, they have 10uF 450V AC capacitor, is that ok?
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zzz_julian_zzz
Fri Jul 20 2012, 01:11AM
zzz_julian_zzz Registered Member #3964 Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
 		what type of capacitor in your shop???

the suggested type of capacitor is polypropelene or MKP, but MKT will do as well..
10 uf / 400 vdc rating MKT should do fine.

I don't see much difference from your previous layout- sorry, but can you use wire with insulation cover?, not like those copper wires in your picture, because they increase the chance of shorting connections unwantedly.

2 x 10uf/400v capacitors you will need. 1 capacitor per pair of mosfets.


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Unleashed
Fri Jul 20 2012, 01:13AM
Unleashed Registered Member #5171 Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
 		The wire is enammeled wire, it's insulated and there is no possibility of a short.

Actually there is a lot of difference between the last layout, in fact i eliminated a lot of wire from the capacitor to the mosfets.

So, for snubbing cap i will need 10uF 400V MKT in parallel with the bridge dC?
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Dr. ISOTOP
Fri Jul 20 2012, 08:04AM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Unleashed wrote ...

So, for snubbing cap i will need 10uF 400V MKT in parallel with the bridge dC?
It needs to be *close* to the bridge. Physically short wiring is key for good snubbing.
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zzz_julian_zzz
Fri Jul 20 2012, 08:48AM
zzz_julian_zzz Registered Member #3964 Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
 		So, for snubbing cap i will need 10uF 400V MKT in parallel with the bridge dC?

=>much better if MKP, but MKT will suffice.
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Unleashed
Fri Jul 20 2012, 11:29AM
Unleashed Registered Member #5171 Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
 		I will add the snubbing capacitor and make a test this afternoon.

Thanks a lot all for the help, i'll let you know.
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Unleashed
Fri Jul 20 2012, 10:20PM
Unleashed Registered Member #5171 Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
 		Hello everyone.

I have a capacitor, it's a AC 450V 10uF, one usually used in the air conditioners to start motors, and other stuffs like that.
Will it do?
Photo Link2 (sorry for bad quality, photo made by cellphone)
I don't think this is going to work, but since i had it laying around, i think that ask about it it's a nice way to find out.
Thanks.
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