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Re: [TCML] ESR ESL figures in caps



Hi Chris,

Since all of your caps are connected in parallel, the bank should be able to handle a peak current of 18*800 = 14.4 kA.

Bert

Chris Swinson wrote:


Hi Bert, all,

May seem a daft question, though what about current ratings of caps, if I have an array of caps rated at 800amps each, does the array add up in amps terms or is it still 800amps regardless of number of caps ? I've always just assumed they add.....

Cheers,
Chris




----- Original Message ----- From: "Bert Hickman" <bert.hickman@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Friday, August 08, 2008 2:21 PM
Subject: Re: [TCML] ESR ESL figures in caps


Hi Chris,

In theory, when paralleling N capacitors, overall ESR and ESL will be divided by N (similar to paralleling discrete resistor or inductors). The capacitance will be multiplied by N. So, the equivalent ESR and ESL will be the individual ESR and ESL divided by the number you have in parallel.

However, in practice, what you ACTUALLY obtain will be a function of your physical layout and interconnection scheme. For reasonably interconnection schemes, both ESR and ESL will still be significantly lower than that of a single cap, but not as low as theory predicts.

Bert

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