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Transformer design: how to size a core?

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Buk:
I want step up Li-ion battery voltage to 100-125V @ 0.5A and ~145kHz.

I'm thinking of using a toroidal transformer to get the voltage boost.

The first thing I need to know is will a suitable size toroid physically fit into the space I have available.

To that end, are there any rules of thumb for sizing a (toriodal) core to handle 50W of power at 145kHz?

T3sl4co1l:
What input voltage?

How much experience do you have with switching power supplies, and Li-ion batteries?

Why such a particular frequency?

If it's just a few cells in series, a push-pull converter is a fine way to go, as typically used in automotive equipment.  Matter of fact, you might get away with a 100W automotive inverter, just saw off the AC "modified sine" chopper circuit.

Edit: oh, right!
https://www.eevblog.com/forum/projects/heat-generation-using-piezo-elements/

Tim

Buk:

--- Quote from: T3sl4co1l on October 13, 2021, 02:11:35 am ---Edit: oh, right!
https://www.eevblog.com/forum/projects/heat-generation-using-piezo-elements/

--- End quote ---

Did that answer all your questions, or should I supply further information?

WattsThat:
Probably the simplest, most practical explanation of DIY magnetics you’ll ever find:

https://ludens.cl/Electron/Magnet.html

T3sl4co1l:
I don't remember you mentioning what battery pack you were going to use so let's start with that :)

Tim

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