grizedale
Advanced Member level 3
Hello,
We are doing a 330W offline half-bridge SMPS.
We must have primary current sensing, or else we won't have short-circuit protection for when we start-up into a shorted output.
However, the cheapest current sense transformer we can find is ....
**broken link removed**
Digi-Key - PE-63586NL-ND (Manufacturer - PE-63586NL)
(PE-63586 from pulseeng.com)
This is $1.76 for 400 pieces.
Its way too expensive.
There is nothing any cheaper anywhere, so we must wind our own.
Now, the turns ratio is 1:50
Getting good coupling from primary to sdecondary with that huge turns ratio is going to be challenging, meaning a multiple interleaved secondary, interleaving a multiple primary , with wide. flat wires.
...this is all going to be very expensive to manufacture.
-So does any reader know if we can get away with some cheap winding technique with such a current sense transformer?
We are doing a 330W offline half-bridge SMPS.
We must have primary current sensing, or else we won't have short-circuit protection for when we start-up into a shorted output.
However, the cheapest current sense transformer we can find is ....
**broken link removed**
Digi-Key - PE-63586NL-ND (Manufacturer - PE-63586NL)
(PE-63586 from pulseeng.com)
This is $1.76 for 400 pieces.
Its way too expensive.
There is nothing any cheaper anywhere, so we must wind our own.
Now, the turns ratio is 1:50
Getting good coupling from primary to sdecondary with that huge turns ratio is going to be challenging, meaning a multiple interleaved secondary, interleaving a multiple primary , with wide. flat wires.
...this is all going to be very expensive to manufacture.
-So does any reader know if we can get away with some cheap winding technique with such a current sense transformer?
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