Z
zenerbjt
Guest
Hi,
In interleave wound transformers (where a secondary is “sandwiched” between two series primary halves), what is the effect on coupling of having the two primary halves of unequal turns?
For example, DER368 by power integrations shows a 12W offline flyback, and a 180W offline forward converter, each with a secondary sandwiched between unequal primary sections.
The flyback (page 29) has the primary split into 27 Turns and 60 Turns. The Two transistor forward (page 240 has the primary split into 22 turns and 41 turns.
Surely the Ampere turns should best be equal either side of the sandwiched secondary? (to get best coupling)
DER368
In interleave wound transformers (where a secondary is “sandwiched” between two series primary halves), what is the effect on coupling of having the two primary halves of unequal turns?
For example, DER368 by power integrations shows a 12W offline flyback, and a 180W offline forward converter, each with a secondary sandwiched between unequal primary sections.
The flyback (page 29) has the primary split into 27 Turns and 60 Turns. The Two transistor forward (page 240 has the primary split into 22 turns and 41 turns.
Surely the Ampere turns should best be equal either side of the sandwiched secondary? (to get best coupling)
DER368