B max flux density

Thread Starter

MATT838383

Joined Jul 31, 2019
144
Hello everybody i have a question on Bmax calculation for the numbers of windings of a ferrite transformer
N(prim) = Vin(nom) x 10°8 / 4 x f x Bmax x Ac
(i dont have the numbers of turns!) thanks a lot
 

TeeKay6

Joined Apr 20, 2019
573
Hello everybody i have a question on Bmax calculation for the numbers of windings of a ferrite transformer
N(prim) = Vin(nom) x 10°8 / 4 x f x Bmax x Ac
(i dont have the numbers of turns!) thanks a lot
Bmax is limited by whichever ferrite material you use. As @Alec_t says, look at the datasheet for your core.
 

Thread Starter

MATT838383

Joined Jul 31, 2019
144
Just checked the data sheet of my ETD34
i have found no tesla or gauss value!
can everybody help me for tesla or gauss calculation?
thank you
 

Thread Starter

MATT838383

Joined Jul 31, 2019
144
Hello Jony130 thank you for your answer! i want to calculate the numbers of windings of the ferrite transformer for a power swiching supply!
 

Thread Starter

MATT838383

Joined Jul 31, 2019
144
So the value of the core is 97mm²
the formula is for etd34
(12X100000000)/(4X(100000KHZ)X(330BmT)X0,97)=9,37 turns! is that too much?
thank everybody!
 

Jony130

Joined Feb 17, 2009
5,539
And for this equation yot have given you need to plag the flux density in Gauss not in Tesla.
Effective cross-sectional Area in cm2 and the frequency in Hertz
 
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Thread Starter

MATT838383

Joined Jul 31, 2019
144
Ae effective area =97mm²
so if i convert tesla in minitesla and frequency khz in hz i do:

(12X100000000)/(4X100000hzX330BmTX0,97mm²)= 9,37! is that rigth?
 
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