zeus_threat
Member
Am starting this new thread after failure to get proper core to build a flyback. The SMPS calculations are as follows:
It will be based on a TL494 with totem pole buffers and GDT. An EI-33 core with an AL of 3719 will be used. I had to test 4 harvested SMPS cores to get two with AL>=3000 some EI-33 cores are same sized look same but have very low AL.
System will work with a bias start up and the ic will be powered from an auxiliary supply built on the EI-33 to eliminate mains transformer.
Overcurrent protection will be implemented based on a current sense transformer.
If all above by chance lets hope ends up working i will add TL431 with optocoupler for regulation
Required output is 12V 4A for main use + 12V 500mA for powering logic circuits, relays e.t.c
I will post schematic soon
Any comment is welcome thanks
PS: forget about the CT in the calculations i just left it there in case i would design a dual supply using the same calculation sheet
It will be based on a TL494 with totem pole buffers and GDT. An EI-33 core with an AL of 3719 will be used. I had to test 4 harvested SMPS cores to get two with AL>=3000 some EI-33 cores are same sized look same but have very low AL.
System will work with a bias start up and the ic will be powered from an auxiliary supply built on the EI-33 to eliminate mains transformer.
Overcurrent protection will be implemented based on a current sense transformer.
If all above by chance lets hope ends up working i will add TL431 with optocoupler for regulation
Required output is 12V 4A for main use + 12V 500mA for powering logic circuits, relays e.t.c
I will post schematic soon
Any comment is welcome thanks
PS: forget about the CT in the calculations i just left it there in case i would design a dual supply using the same calculation sheet