hi,


This is the smps that i bought recently. There is no model name on the transformer. So anyone has any idea on this? there is 8 pins(each side 4 pins) on this transformer. How could i draw this transformer in a form of schematic diagram? i mean the winding part.

thank you.

 

You might have to ring out the windings with a meter and look on the PCB as to the connections to get the functions.

 

hi beenthere,



this is basically the connection that i trace from the PCB.Any idea?

thank you.

 

It's a flyback SMPS transformer.
I would say there are two primary windings and one secondary winding.

One primary winding would connect the drain of the switching device in the SMPS controller and the positive rail of the rectified mains.

I'm a bit unclear about the other primary winding in the way it is connected.
An educated guess would be to say it is there to supply the switching regulator with power.

You seem interested in SMPS so i'll give you the names of a few books that I found really useful when i was learning about them.

Marty Brown - Power Supply Cookbook 2nd Edition

Abraham Pressman - Switching Power Supply Design

George C. Chryssis - High Frequency Switching Power Supplies: Theory and Design

 

It's a flyback SMPS transformer.
I would say there are two primary windings and one secondary winding.

ok.Usually how people draw this type of winding in the way of schematic diagram?

thank you.

 

Here are examples - http://www.allaboutcircuits.com/vol_2/chpt_9/5.html

 

I would say there are two primary windings and one secondary winding.

Since for the secondary side,physically i can see 4 legs there. So it doesn't mean that 2 legs for one winding? coz u mentioned that there is only one secondary winding.

thank you.