Here is my We Bench Design=https://webench.ti.com/power-design...ated=Y&Topology=Flyback&source=AC&line_fsw=60
Question: Is it even possible to just have 3 turns in secondary of the transformer or we bench is wrong?
Exactly!! The number of secondary turns, and the number of primary turns, both depend on the application and the application circuit. That is the way good designs work out.Why ? Because 3 turns on secondary may produce the needed voltage of about 12V or more from the rectified unknown 120 or 240 VAC mains.
Yep. My spot welder uses 3 microwave transformers with 1/2 turn each, and outputs several thousand amps at very low voltage.People repurpose microwave oven transformers with one turn to make spot welders. Produces a lot of current.
Bob
It's a current-mode flyback circuit - you can tell from the circuit configuration even though you can't see the component values.The inrush current may be very high.
Indeed!! look at the transformers in the switchmode power supply of an older desktop computer and see that the transformer there, stepping down from the rectified mains voltage, has only a fairly small number of turns. And certainly there is "an inrush" of current. But as it is switching DC on and off that is OK, that is how switchers work.It's a current-mode flyback circuit - you can tell from the circuit configuration even though you can't see the component values.
There won't be inrush current.
The software is Texas Instruments' WeBench, you can access it from their website - the designs it produces are reasonably sensible.
The 35:3 is the turns ratio. A transformer with a physical 35 turns primary is not meant for 50 or 60 Hz mains operation. It is for a High Frequency operation, a few 10's of Kilohertz. And the core will be of Ferrite material to prevent eddy current losses.View attachment 250432
View attachment 250433
Here is my We Bench Design=https://webench.ti.com/power-design...ated=Y&Topology=Flyback&source=AC&line_fsw=60
Question: Is it even possible to just have 3 turns in secondary of the transformer or we bench is wrong?
I wouldn't call it an "inrush" - it ramps up from zero to a point where the controller switches it off.And certainly there is "an inrush" of current.
Probably , since I was about to say the same thing.Or am I just being too pedantic about that?
All right, I'm a pedant.Probably , since I was about to say the same thing.
Bob