Determining Current Flow in an Ideal Transformer

[Infidel22]

I am having some difficulty detertming the directions current should flow in an ideal transformer given a certain dot convention. My general understanding in the past was that you simply used conservation of power: V1I1=V2I2, thus if the sign of V2 is opposite of V1, then the sign of I2 must be opposite of I1. However, when attempting to analyaze a forward converter, I end up getting the current directions backwards.

Is there any simple pattern to follow when deriving current directions through an ideal transformer?

 

[Astronuc]

A tutorial on the "dot convention" used in transformers.

http://www.allaboutcircuits.com/vol_2/chpt_9/4.html

The current direction in a wire conductor (rather than transformer magnetic conductor) is affected by the 'winding direction' with respect to the magnetic flux.