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Re: EMI Filters in parallel, PFC question

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> 

On 9 Jun 2004, at 6:39, Tesla list wrote:

 > Original poster: David Speck <dave-at-davidspeckmd-dot-org>
 > Bob,
 > EMI Filters are low pass filter circuits.
 > If you parallel them, you can double the current capacity of your
 > supply, but you will halve the EMI protection (i. e., double the
 > amplitude of EMI that will pass the assembly).
 > If your series them you double the power dissipated within the filter,
 > but you will halve the amount of EMI that would get  through one
 > filter.

That depends on the characteristics of the filters doesn't it?
Passive filters generally require defined terminating impedances in
order to function to a particular requirement. Those impedances
affect the Q of the filter and its pass/stop characteristics at
different frequencies.