Transformer and choke design
Colin J. Tuck ( Senior VP Global Corporate Engineering )
Power electronics IP at pwrtrnx.com
Above an excerpt from Dr. Ray Ridley on transformer design.
A note-able sentence is the bit about there being no closed form solution to optimising for proximity effect.
Transformer design ( whether you admit to it or not, or like it or not ) - or, I should say - good transformer design ( i.e. you design it - it works - no horrendous temp rise )
relies on designer experience - and an amount of good modelling.
This includes a good knowledge of litz wire, and the properties of higher current copper stampings ( for planar )
If a designer is serious about getting the AC losses ( at 150kHz say ) down to 20-30% higher than the DC - you really need to almost be able to see the current distribution in a mooted set of windings. Experience lets you do this.
For magnetics design that works first time, first pass -
Power electronics IP at pwrtrnx.com
2 周Where to put the wires - and what wires or foil to use - does not fall out of any magnetics design program - the designer has to know what is best - then that mooted implementation can be analysed. Experience is the winning guide.
President Ridley Engineering, Owner POWER SUPPLY DESIGN CENTER GROUP on Linked In
2 周You can download the original article from switching power magazine here. https://ridleyengineering.com/images/phocadownload/13%20proximity%20loss.pdf
President Ridley Engineering, Owner POWER SUPPLY DESIGN CENTER GROUP on Linked In
2 周We have moved on a long way from this early paper. Now RidleyWorks solves the whole problem for you and even build ltspice models of the proximity.