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Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
(from my understanding) Grounding the negative rail of the controller along with case, helps to prevent damage to the board in the event that a spark strikes the controller. It also helps to cut down on the amount of EMI getting to the controller. There is the issue of common mode noise from the bridge getting coupled back threw the GDT into the bus of the controller but this seems easily fixed by running the primary's of the GDT threw a ferrite bread. The extra inductance seems to help block the common mode noise from getting back threw to the controller. I saw this trick on Steve Ward's web site and works very well.
As for streamers hitting the strike rail this seems to have no effect on the controller when they share a common ground. The higher current RF wants to take the easiest path back to the secondary base, so unless you manage to put the controller in the path from the strike rail to the secondary base the RF currents should have no interest in flowing into the controller.
All this info is just from my point of view and what Ive tried with my coils, not entirely sure what is really going on. All I know is that this grounding method works on all of my DRs with no fuss at all, and seems to help in preventing bridge meltdown in the event of a primary strike.
Registered Member #2150
Joined: Tue Jun 02 2009, 08:33PM
Location:
Posts: 29
Goodchild wrote ...
The way I run my coils is like this:
I have a big dedicated RF ground for the secondary and strike rail and I have the house ground.
All of these grounds are connected together at the coil and all electronics are grounded.
Controller negative rail is connected to RF ground heatsink and fans are connected to RF ground bridge negative bus is connected to RF ground via a 0.1uF cap
And house ground and the dedicated RF ground are connected together at the coil.
Doesn't joining the two grounds defeat the point of having a dedicated RF ground?
Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
No it's doesn't. You have to connect the two grounds together in order to use the grounding method for the bridge.
Why use two grounds together?? oO With two grounds what only happen is that the current in each ground will be half the current that using only a ground. Correct? With only a big RF ground all will work well, right?
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DRSSTC ground scheme
the RF currents should have no interest in flowing into the controller.
