..... I can see why I should use \[I_{P,max}\] (which occurs at \[V_{DC,min}\]) for estimating the copper losses and sizing the wire gauge for the primary. But the equations 175 and 176 in the O.P. don't have current in them.
As far as I understand, the core goes into saturation when \[{\Delta}B\] is too high. Eq. 175 in the O.P. shows the direct relationship between \[{\Delta}B\] and \[V_{DC}\] (or\[V_P\]). Wouldn't \[V_{DC,max}\] be the worst case for core saturation :?: (While \[V_{DC,min}\] is the worst case for primary copper.)
- Nick