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problems.. keeps tripping the house power

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teravolt

Sun Oct 11 2009, 11:52PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

cm300 might be to slower but it would be beefier and cheaper. 25$ on ebay. maby adding a little dead time to your circuit maby not at all would work

audio:deviant

Tue Oct 13 2009, 01:33PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

right its not the igbt's, got the new pair today and same problem, so im stumped.

Herr Zapp

Tue Oct 13 2009, 04:05PM

Registered Member #480 Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644

ad -

Let's start at the beginning .......

In your first post, you stated that "when i apply over 20V to the high voltage side it trips the house voltage".

1. Do you actually mean "20V", or 200V?
2. How are you adjusting the DC supply voltage? With a variac? If so, what is the currrent rating of the variac?
3. When you say "it trips the house voltage", do you mean it trips a circuit breaker in the main AC circuit breaker panel? Or is there also a ground-fault or leakage-current circuit breaker somewhere in your house AC power circuit?
4. What is the marked current rating of the circuit breaker that is tripping?
5. Are there any other appliances (or anything else that might be drawing any current) connected to the branch circuit supplied by the circuit breaker that is tripping?

Regards,
Herr Zapp

audio:deviant

Tue Oct 13 2009, 04:53PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

hello, sorry for not being spesific right.

1. yeah sorry i ment 20V, i got the coil upto 200v for the first time and now i have breaker problems
2. its a variac, im in the uk so 240v input 5A output
3. yeah the circuit breaker planel, one of the switches flips off. i dont know about the ground fault...
4.the one its tripping says 80A on it
5. no nothing else drawing current. felt paranoid of killing anything plugged in close to it.

this is the first few times running it so its a little frustrating to finally have it running and then dieing on me..

cheers

teravolt

Tue Oct 13 2009, 05:39PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

hi audio:deviant,
1: is the unit eating fets
2: is there current limiting in your circuit
3: is the unit in tune
4: does it function enough at lower voltages say 80vac

do you have a current probe to see how much is going through your fets? I think that as it is more in tune and arcs get bigger it will draw more current. also you could reduce your duration on your interuptor.

audio:deviant

Tue Oct 13 2009, 06:08PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

ive got no way of testing the fets... when i switch the power off it doesnt drain as fast as it did when it was working took a couple seconds. when i was doing testing it was much slower and it seem to be about the same kind of bleed time. (hope that makes sense)

what do you mean by limiting the circuit?

3. its not in tune at the moment, that was i was going to try and work but the it just stopped working...

4. no doesnt function just hits the power off at 20v dont here anything out of it....

could the resonator board be causing problems?

loveHV

Tue Oct 13 2009, 06:09PM

Registered Member #1854 Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88

is the circuit breaker tripping when you put on the power without the driver online, or is it when you start your driver circuit that your breaker trips.

if it trips with the IGBT's connected and it works fine without the IGBT's then you should check for short circuits, like live heatsinks or maybe wire isolation that is damaged and connects to another wire wich short circuits

if its your bridge that is causing the breaker to trip then measure the resistance of the bridge.

audio:deviant

Tue Oct 13 2009, 06:28PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

ive disconnected the 3500uf 450v cap from the half bridge and charged it up, all it good on that end.

the driver doesnt trip the power when it on. should i take out the igbt's and put the dc power though the bridge?

loveHV

Tue Oct 13 2009, 06:32PM

Registered Member #1854 Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88

how do you power your driver ?

try to draw a schematic that should give us a good insight of your DRSSTC

audio:deviant

Tue Oct 13 2009, 06:39PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

well ive build to the spec of the eastern voltage research mini brute schematics but have a bigger mmc and single dc cap.

heres schematic to the mini brute system.

hope that helps

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