T
treez
Guest
Hi,
The attached is a former cross section of a 140W Flyback transformer.
Vin = 228VDC
Vout = 24V
Iout = 5A
Fsw = 43kHz
(BCM)
Core = Ferroxcube E42/21/15 3C90 gapped to 0.85mm (centre leg) giving AL = 315.
It is a single primary coil, which is sandwiched inside two secondary coils, SEC1 and SEC2.
SEC1 and SEC2 are in parallel with each other.
NP/NS = 24/10
PRI = 24 turns of 7/0.24mm TEX-ELZ
SEC1 = 10 turns of 2 strands of 7/0.3mm TEX-ELZ
SEC2 = 10 turns of 2 strands of 7/0.3mm TEX-ELZ
LP = 181uH, LS = 31.5uH
I(pri) peak = 6A.
I(sec) peak = 14.4A
The core is packed out with 0.6mm diameter fishing line to a depth of 1.2mm (to keep turns away from centre leg gap)
I am wondering how awkward practically its going to be to wind and terminate the thick secondaries? As you know, TEX-ELX isnt purchaseable in small quantities so we cant even "have a go". Usually send off to winder to ask their advice but this proj doesnt have go -ahead yet.
Do you know?
TEX-ELZ
E42/21/15
The attached is a former cross section of a 140W Flyback transformer.
Vin = 228VDC
Vout = 24V
Iout = 5A
Fsw = 43kHz
(BCM)
Core = Ferroxcube E42/21/15 3C90 gapped to 0.85mm (centre leg) giving AL = 315.
It is a single primary coil, which is sandwiched inside two secondary coils, SEC1 and SEC2.
SEC1 and SEC2 are in parallel with each other.
NP/NS = 24/10
PRI = 24 turns of 7/0.24mm TEX-ELZ
SEC1 = 10 turns of 2 strands of 7/0.3mm TEX-ELZ
SEC2 = 10 turns of 2 strands of 7/0.3mm TEX-ELZ
LP = 181uH, LS = 31.5uH
I(pri) peak = 6A.
I(sec) peak = 14.4A
The core is packed out with 0.6mm diameter fishing line to a depth of 1.2mm (to keep turns away from centre leg gap)
I am wondering how awkward practically its going to be to wind and terminate the thick secondaries? As you know, TEX-ELX isnt purchaseable in small quantities so we cant even "have a go". Usually send off to winder to ask their advice but this proj doesnt have go -ahead yet.
Do you know?
TEX-ELZ
E42/21/15
