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Rollingblackout

Sat Jun 20 2009, 06:32PM

Registered Member #1524 Joined: Sun Jun 08 2008, 05:25PM
Location: Grand Junction, Colorado
Posts: 38

I'm looking at the CCM1235-ND 15 amp EMI filter (from digikey)as a power entry for both the 0-120 vac and the control section of my mini brute. Are these a good choice to protect my house and everyone else for that matter.

[MOD EDIT: Image deleted - size too big - read the rules]

HV Enthusiast

Wed Jun 24 2009, 04:54PM

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

Rollingblackout wrote ...

I'm looking at the CCM1235-ND 15 amp EMI filter (from digikey)as a power entry for both the 0-120 vac and the control section of my mini brute. Are these a good choice to protect my house and everyone else for that matter.

[MOD EDIT: Image deleted - size too big - read the rules]

When building a Tesla coil, always assume there will be risk to your house / electronics regardless of what filters you use etc... So to answer your question, they might help reduce the hash spit back on the line from the DRSSTC, however, i myself personally don't use any type of filtering.

The most important thing you can do is to have a ground target for the DRSSTC to arc to and to connect the grounded target back to the EARTH ground point of the secondary. This ensures circulating discharge currents stay within the coil. Otherwise, if you arc to the wall in your house or ceiling etc... (or even floor), the circulating discharge currents will travel all over your house wiring trying to find its way back to the coil. Not good.

Austin

Wed Jun 24 2009, 08:39PM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

Daniel do have a full/half bridge schematic for CM600 IGBTs? I want to build the MEGABRUTE mentioned on your site. I am assuming I can use the resonate board from the minibrute. I'll make the appropriate changes to the secondary, primary, and MMC.

Also instead of pulling from a single 240 line can you just use two 120 volt lines from two separate breakers?

HV Enthusiast

Wed Jun 24 2009, 10:33PM

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

Austin wrote ...

Daniel do have a full/half bridge schematic for CM600 IGBTs? I want to build the MEGABRUTE mentioned on your site. I am assuming I can use the resonate board from the minibrute. I'll make the appropriate changes to the secondary, primary, and MMC.

Also instead of pulling from a single 240 line can you just use two 120 volt lines from two separate breakers?

Steve Ward should have some CM600 based DRSSTC schematics.

lhl_henrylui

Fri Jul 10 2009, 05:35AM

Registered Member #1498 Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72

I've just received the Minibrute reference book and I really don't understand a part in the schematics.As I'm not a EE so I'm not sure whether that is a mistake.Please look at p.29 in the book(figure2-8).The current transformers are connected to the secondary but not primary.However,the previous chapter said that this DRSSTC uses primary feedback,isn't it? Also,the ground of the secondary should not be earth ground but RF ground,right?

Austin.Weil

Fri Jul 10 2009, 06:10AM

Registered Member #1170 Joined: Wed Dec 12 2007, 09:53AM
Location:
Posts: 2

yes this is a mistake in the text. make sure to read this thread fully, this question has already been answered here.

lhl_henrylui

Fri Jul 10 2009, 06:15AM

Registered Member #1498 Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72

Sorry,I have just found them.
Another question: If the currents are reconnected to the primary,are they also connected to the RF ground?

Austin

Fri Jul 10 2009, 04:11PM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

lhl_henrylui wrote ...

Sorry,I have just found them.
Another question: If the currents are reconnected to the primary,are they also connected to the RF ground?

I'm not sure that i understand your questions. But i will give a stab at it anyways...

in figure 2-8, the current transformers are wrapped around the secondary wire which is connected to RF ground, this however this has since been changed. instead the current transformers are now wrapped around the primary wire. if you read the the this thread it will show you exactly where to put the current transformers. Also the primary is not connected to ground.

lhl_henrylui

Sat Jul 11 2009, 12:53AM

Registered Member #1498 Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72

Are the current transformers possible to be homemade?I don't want to order them on internet because the shipping bill is very expensive.

Austin.Weil

Sat Jul 11 2009, 08:39PM

Registered Member #1170 Joined: Wed Dec 12 2007, 09:53AM
Location:
Posts: 2

lhl_henrylui wrote ...

Are the current transformers possible to be homemade?I don't want to order them on internet because the shipping bill is very expensive.

I'm not a EE but as far as i understand it, a current transformer is basically coiled up magnetic wire that has a current induced upon. that induced current is the feedback signal that gets sent to the resonance board which helps drive the IGBTS.

^--- I could be totally wrong tho

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