Electrical – Confusion about ccfl inverter transformer

ccflinvertertransformer

I have this transformer that came from a ccfl inverter and the pins on it are confusing me a bit.

I've tested every pin and only pin 3 and 6 seem to form the primary winding and somehow pin 1 and 8 form a connection? no pins on the secondary seem to form a winding.

why would pin 1 on the primary side connect to pin 8 on the secondary?
If pin 1 and 8 form the secondary, why?

enter image description here

other angles

http://i.imgur.com/6zQvw0J.jpg

Best Answer

The primary can be any physical location/pin on the transformer and ditto the secondary. The only constraint is that if you expect a decent level of voltage isolation then make sure you use enough "distance" between primary pins along one edge and secondary pins along the same edge. Looking at your picture in detail I'd say this design was good for a 1000 volts: -

enter image description here

Probably the bigger issue would be with the PCB with what is called "tracking" of high voltage PCB traces with low voltage ones.

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