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naok

Sun Aug 22 2010, 01:00AM

Registered Member #3128 Joined: Thu Aug 19 2010, 12:23PM
Location: Tokyo,Japan
Posts: 17

thank all!

My OCD setting change to some parameter,but didn't change the spark length.

I will try to many change that you suggested.
And,I will buy variac big transformer!!!

teravolt

Sun Aug 22 2010, 01:57AM

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

hi naok, what does your spark look like. there are a lot of open leads and proto boards do you think you may have any unwanted feedback. for grounding maby a pipe or a safety ground on your power lead if you have one is more suitable. what are you using as a interrupter for Steve's circuit? do you have scope pictures of the gate drive transformer wave forms? what type of FET's are you using for your bridge?
After listening to your video the spark sounds erratic do you think that the bridge is getting the proper signals to the fets? and finally did you duplicate Steve's method for a gate drive transformer using CAT5 or did you try something else?

naok

Sun Aug 22 2010, 09:12AM

Registered Member #3128 Joined: Thu Aug 19 2010, 12:23PM
Location: Tokyo,Japan
Posts: 17

Hi,teravolt!

My complete circuit of interrupter and driver is here.

The IGBT is HGT1N40N60A4D.

I didn't use CAT5 cable.
Steve wrote on his Web site,'I then parallel all of the "white" conductors, and then series up pairs of the "color" conductors.'

This English sentence is very simple,but too difficult for me.HaHaHa.
I saw some pictures of his GDT.But,I didn't understand.

My GDT and waveform is here.
Request,If you need anothr pictures.

Bennem

Sun Aug 22 2010, 09:37AM

Registered Member #154 Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260

naok wrote ...

]

You are using primary feedback right?
because in your picture you state that the secondary wire goes through the feedback CT's.
also i don't think your window frame is a sufficient earth.
you might want to use your supply capacitors in a doubler arrangement
as you stated that you only have 100v available there.

HV Enthusiast

Sun Aug 22 2010, 12:21PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

naok wrote ...

I uploaded pulse form movie.

If you request more movie,I will upload another.

By the way, my secoundry ground is setting on window frame.
I think it's too small.
is this a problem?

I don't think that would be a good ground. You need a really solid ground.
If its a low power DRSSTC, you can probably get by with using the electrical outlet ground, otherwise, either make a dedicated ground (using grounded rod outside) or some other substantial ground.

Right now you're just attached to a door that could be totally floating, electrically, for everything.

naok

Sun Aug 22 2010, 02:58PM

Registered Member #3128 Joined: Thu Aug 19 2010, 12:23PM
Location: Tokyo,Japan
Posts: 17

Hi! Bennem.

You are right!
My feedback is using secoundry.

I founded doubler arrangement circuit.
herewith,I will don't have to buy the big variac transformer.yeah!

ï¼¨ï½‰ï¼EastVoltResearch.

I see.
As I thought, Secoundry ground is important.
But I don't have such a large ground.
I have to find a good ground...hmm.
There is a no garden in typical japanese house, so find the ground is difficult.

good night all....

teravolt

Sun Aug 22 2010, 09:32PM

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

do you plan to use primaty feadback?

Bennem

Sun Aug 22 2010, 10:22PM

Registered Member #154 Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260

yes....you need to switch to primary feedback,

Are your ct's something like CST206-1A or similar?
They need to be burdened with a low value resistor too if you haven't already
done so.

Btw....you probably still need a variac,
but when you have the coil running ok at full mains voltage
you may be able to remove the variac and place some kind of current inrush limiter.
you can then adjust the power level with your interrupter.

naok

Mon Aug 23 2010, 11:04AM

Registered Member #3128 Joined: Thu Aug 19 2010, 12:23PM
Location: Tokyo,Japan
Posts: 17

Hi,teravolt and Bennem.

Oh, my God.
I have to use primary feedback for feedback and OCD.
But,I could plan the circuit according to your explanation.
I will try to change when I get home...

I already have my variac.However,Turn ratio of that variac is 1:1.3...

But,you said "you can then adjust the power level with your interrupter".
I know what you mean.It's very interested.

teravolt

Mon Aug 23 2010, 07:32PM

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

Hi naok,that looks good once configuerd your burden resistor may have to be adjusted.

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