Author Topic: Determining primary turns?  (Read 592 times)

Offline Sparkjunkie15

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Determining primary turns?
« on: December 27, 2021, 01:01:39 AM »
I have a few quality flybacks and I’m confused on how to determine the proper amount of primary turns to use with my half bridge driver. The secondaries are 2500turns but how many turns should the primaries be? Any resources to calculate this would be greatly appreciated.

Offline PowerTech

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Re: Determining primary turns?
« Reply #1 on: December 27, 2021, 06:31:00 AM »
"Ferrite transformer turns calculation with example"
https://microcontrollerslab.com/ferrite-transformer-turns-calculation/

Offline AstRii

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Re: Determining primary turns?
« Reply #2 on: December 27, 2021, 04:50:39 PM »
Electronics is all about impedance matching. If your driver can provide say 10Amps, you have to make sure the primary impedance is high enough that the current will stay below 10A. Also the wires of the primary have to withstand the current, so use either thick wire for low frequencies or litz wire for high frequency application.
Also don't forget that if the coupling in your transformer is too high, the primary inductance will drop significantly while loading the secondary. So it's not that easy as just measuring the inductance of the primary and then calculating it's impedance. At no load, the impedance will be the highest therefore current will be the lowest.
Marek Novotny
Czech Republic, Czech Technical University in Prague
www.uhvlab.org

Offline Sparkjunkie15

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Re: Determining primary turns?
« Reply #3 on: December 28, 2021, 03:03:34 AM »
Thanks for the replies, now the learning and tinkering continues.

Offline PowerTech

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Re: Determining primary turns?
« Reply #4 on: December 28, 2021, 08:03:38 AM »

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Re: Determining primary turns?
« Reply #4 on: December 28, 2021, 08:03:38 AM »

 


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