You can ask the manufacturer for ESR and ESL data, but if you have an
impedance/frequency graph, you can probably estimate them. The ESL comes
from the resonance frequency, where the impedance is a minimum, and that
minimum impedance is the ESR.
On 2025-02-02 19:34, [email protected] wrote:
Thanks, John.
We’re looking for good Y and X capacitors for the EMI net filter.
Our plan is to use metallic Polypropylen / Film X-caps, and ceramic
Y-caps.
Select correct voltage range, but can’t find that much information
about ESR and ESL in the datasheets. The LTSpice model should have
them included anyway.
Anybody here that have “favorites caps” or manufacturers to suggest
for EMI netfilter?
Best regards
Amund
*Fra:*John Woodgate
*Sendt:* 1. februar 2025 16:49
*Til:* [email protected]
*Emne:* Re: [PSES] SV: [PSES] EMI net filter layout
Apparently correct, but you should as Schaffner whether the component
can be connected like that and still meet its voltage and current
ratings, and whether there are any other matters to take into account.
On 2025-02-01 15:11, [email protected] wrote:
Need a CM choke for high voltage and high currents in the EMI net
filter.
This one, https://www.schaffner.com/article/rv8141-50-s03, has 4
windings. Since we are doing only a 1-phase system, we are
planning to use 2 windings pr. phase.
So, when the terminals are like this:
we plan for such a connection to utilize all four windings:
Are the terminals connected correct with the windings in series,
so the complete choke acts as a 1-line CM choke?
Best regards Amund
*Fra:*Ralph McDiarmid
*Sendt:* 30. januar 2025 21:38
*Til:* [email protected]
*Emne:* Re: [PSES] EMI net filter layout
Hi Amund,
You can breadboard the filter as well. No compelling need go
immediately to a PCB only to find you need to change it once or
twice while you converge on a final design. Careful attention to
component lead dress and to a general, tidy physical layout is
important above a few megahertz.
Ralph
*From:*[email protected] <[email protected]>
*Sent:* January 30, 2025 4:56 AM
*To:* [email protected]
*Subject:* [PSES] EMI net filter layout
During troubleshooting in test lab, it is tempting to be quick and
connect filter solutions with soldering and some wires.
Instead, you should probably lay out components on a pcb and get
it as it is described in the books. But in practice, at the test
lab, you can't do that and the question is how messy can such an
EMI filter be?
How long can the wires between CM chokes, capacitors be and when
you don't solder but use Wago-connectors for interconnection, is
it so that the filter is almost already destroyed by the impedance
that you have no control over?
As we get up in frequency (conducted emission 150kH-30MHz), messy
design / connection will get more worse when frequency increase,
but we will get trouble anyway in the 150kH-30MHz range. At least
from 1MHz. Right?
BR
Amund
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