Z
zenerbjt
Guest
Hi,
We wish to do a 240VAC 31W Offline PFC’d flyback LED driver with a Ferroxcube PQ2625 Ferrite core.
The winding cross section is as attached. NP=26, NS = 14. (The “N4” winding was never used)
Secondary is “sandwiched” between two primary halves.
The PQ2625 core is centre leg gapped with gap of 0.42mm. We make no attempt to situate turns on the former so that they are away from the centre leg gap.
The primary current (always DCM) is as attached. It has a peak of 2.9A and Bpk is 0.28T. The switching frequency is approximately 66kHz across the 10ms mains half sine. (its COT with Off-time of 13.4us)
Is there any simulation tools we can use to calculate the power dissipation in the windings due to the fringing flux field in the vicinity of the core gap?
TEX-E Triple insulated wire:
PQ2625 Ferroxcube datasheet:
We wish to do a 240VAC 31W Offline PFC’d flyback LED driver with a Ferroxcube PQ2625 Ferrite core.
The winding cross section is as attached. NP=26, NS = 14. (The “N4” winding was never used)
Secondary is “sandwiched” between two primary halves.
The PQ2625 core is centre leg gapped with gap of 0.42mm. We make no attempt to situate turns on the former so that they are away from the centre leg gap.
The primary current (always DCM) is as attached. It has a peak of 2.9A and Bpk is 0.28T. The switching frequency is approximately 66kHz across the 10ms mains half sine. (its COT with Off-time of 13.4us)
Is there any simulation tools we can use to calculate the power dissipation in the windings due to the fringing flux field in the vicinity of the core gap?
TEX-E Triple insulated wire:
PQ2625 Ferroxcube datasheet:
