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Chokes in the ground "plane"
Chokes in the ground "plane"
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Old 17th June 2013, 02:37 PM   #1
Bas Horneman is offline Bas Horneman  Netherlands
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Default Chokes in the ground "plane"

I've often seen that in high voltage psu's the chokes can be put in the ground because that is safer. But it works just as well?

Is this the way one should do it?
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Old 17th June 2013, 02:40 PM   #2
12E1 is offline 12E1  United Kingdom
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Quote:
Originally Posted by Bas Horneman View Post
Is this the way one should do it?
Not quite. You have shown all the capacitors with a ground connection. Only the last one (C22 in your example) should have the ground connection, otherwise the ground is acting as a short circuit across the inductors. You also need to show where the centre tap of the transformer secondary goes - it should go to the negative terminal of the first capacitor (C20).
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Old 17th June 2013, 02:42 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Should a choke go open circuit you could end up with high volts on the input jack ground and kill someone.
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Old 17th June 2013, 02:48 PM   #4
Bas Horneman is offline Bas Horneman  Netherlands
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Quote:
Only the last one (C22 in your example) should have the ground connection
I thought so. Thanks. This is actually as I had drawn it initially.

Quote:
Should a choke go open circuit you could end up with high volts on the input jack ground and kill someone.
Do you mean even when it is correctly wired as below?
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Last edited by Bas Horneman; 17th June 2013 at 02:51 PM.
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Old 17th June 2013, 02:54 PM   #5
Vinylsavor is offline Vinylsavor  Germany
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Hi!

I read about one disadvantage of this approach:
You have some stray capacitances from the transformer secondary to the core and thus to ground. This stray capacitance is in parallel with chokes in the ground return and thus bypasses them.

How relevant this effect is? I don't know. Your chokes have some winding capacitances too. So it probably depends on the transformer.

I'd get proper chokes which can handle the voltage.

Best regards

Thomas
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Old 17th June 2013, 03:04 PM   #6
Bas Horneman is offline Bas Horneman  Netherlands
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Quote:
I read about one disadvantage of this approach:
Ah...never knew this. I thought this approach had no drawbacks.
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Old 17th June 2013, 03:14 PM   #7
DF96 is offline DF96  England
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Old 17th June 2013, 03:28 PM   #8
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I may be wrong, but the schematic in post 4 does not look correct to me.
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Old 17th June 2013, 03:38 PM   #9
Frank Berry is offline Frank Berry  United States
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Quote:
Originally Posted by bear View Post
I may be wrong, but the schematic in post 4 does not look correct to me.
The transformer center tap must go to the first (left) inductor.
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Old 17th June 2013, 04:56 PM   #10
12E1 is offline 12E1  United Kingdom
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Quote:
Originally Posted by nigelwright7557 View Post
Should a choke go open circuit you could end up with high volts on the input jack ground and kill someone.
Not if the grounding is done correctly. You would actually end up with a high negative voltage on one side of the faulty choke, and on the negative end of those components preceding it (capacitors, other choke, as applicable). The ground would still be ground, and the HT would not be HT.
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