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Forum Index : Electronics : how to calculate core loss

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rustyrotors
Newbie

Joined: 07/01/2023
Location: United States
Posts: 36
 Posted: 09:32pm 11 Sep 2023 Copy link to clipboard Print this post

Could someone be kind enough to explain how to calculate core loss of a choke in an inverter application? I am getting a bit confused trying to figure it out.
24V inverter
the choke is a stack of four 250125 Sendust cores with 4 turns

The data sheet is here:
https://datasheets.micrometals.com/MS-250125-2-DataSheet.pdf

Arthur_Dent
Newbie

Joined: 18/07/2023
Location: United Kingdom
Posts: 5
 Posted: 10:08pm 11 Sep 2023 Copy link to clipboard Print this post

Hi

You are very fortunate to be looking at a core from Micrometals.  They have fantastic design tools, e.g.:  https://www.micrometals.com/design-and-applications/design-tools/inductor-analyzer/

Using this tool, you can figure out the loss, and more importantly the temperature rise of your proposed core.

You will need to know some details of your operating mode: topology, frequency, voltage, current, wire characteristics, etc, etc.

Hope this helps.

rustyrotors
Newbie

Joined: 07/01/2023
Location: United States
Posts: 36
 Posted: 02:52am 12 Sep 2023 Copy link to clipboard Print this post

edit..

I was using this guide, specifically method 1, example 3, where there is only AC current, no DC:
https://www.mag-inc.com/design/design-guides/powder-core-loss-calculation

it just occurred to me my numbers may be off bc i was using transformer primary peak-peak voltage to find current instead of peak-peak voltage drop across the choke at 50kHz. which would make results more reasonable.
Edited 2023-09-12 13:06 by rustyrotors