Hi all
I would like to know what formula using to calculate the leakage choke ?
I know +6 sources of information on net, book, thesis... with different calculation.
But none gives a predictable result : the measurement is 25 to 30% higher
Most are, like Valve march 1997 :
K x 10-9 x N ^2 x Lmoy x ( d + dcu/3 ) /B x m^2
k varie between 0.417 and 10.6 (differents unities)
N number of turns
L moy turn length
d insulation thickness
dcu winding thickness
m number of sectioning
d coil height
a total thickness of the windings
or as P Turner has exemple.
0.417 x 10-9 x N ^2 x Lmoy x ((2 x m x d) + a)) / m ^2 x d
Many thanks for your feedback
Yan
I would like to know what formula using to calculate the leakage choke ?
I know +6 sources of information on net, book, thesis... with different calculation.
But none gives a predictable result : the measurement is 25 to 30% higher
Most are, like Valve march 1997 :
K x 10-9 x N ^2 x Lmoy x ( d + dcu/3 ) /B x m^2
k varie between 0.417 and 10.6 (differents unities)
N number of turns
L moy turn length
d insulation thickness
dcu winding thickness
m number of sectioning
d coil height
a total thickness of the windings
or as P Turner has exemple.
0.417 x 10-9 x N ^2 x Lmoy x ((2 x m x d) + a)) / m ^2 x d
Many thanks for your feedback
Yan
I also get higher values, approximately 20-30% higher than quoted and I guess the secondary leakage inductance is not taken into account, but I stopped researching on this issue, concentrating more on capacitance.
Yes, I'm pretty happy with the Velleman PCSU200. Simplistic, not much expensive, good enough bode plot options. I'm also using a DRV134 interface to test PP transformers.
Yes, I'm pretty happy with the Velleman PCSU200. Simplistic, not much expensive, good enough bode plot options. I'm also using a DRV134 interface to test PP transformers.
I have both too but i have also a Picoscope because it has more resolution.
The Analog Discover 2 is also cheap and has more resolution.
I am wondering what the copper loss in this transformer is and also some other information as turn ratio and the low frequency response (same 2x 510 Ohm driver imp.)
For this transformer I chose a primary inductance range of 40-45H with a small airgap to add some headroom for Idc imbalance.
Impedance ratio chosen is 3.6k : 4R/9R
Primary Rdc: 56R
Secondary Rdc 4R: 0.10Rdc
Secondary Rdc 9R: 0.15Rdc
Best regards,
Alexander.
Impedance ratio chosen is 3.6k : 4R/9R
Primary Rdc: 56R
Secondary Rdc 4R: 0.10Rdc
Secondary Rdc 9R: 0.15Rdc
Best regards,
Alexander.
If you think "merged" lams are a problem you could "de-merge" the lams with a little acid etching. OPTs wont mind, they need a little airgap anyway...
Thanks for your idea. I actually not worried about the short cut for the eddy loss at high frequency. The silicon iron B23P085, is the best I got with reasonable price. Next step, I want to build a AC bridge to find the minimum turns of Primary for a given Ra-Load.
Best regards!
Andy
