When Designing SMPS we calculate all the parameter on minimum DC bus voltage (eg 85Vac*1.414=100VDC), and we get require inductance for primary winding is Lp (eg 0.97mH). But in real we run on Normal nominal line ( eg 240*1.414=340), so as per calculation I observe we require inductance change to 3.2mH. How this extra inductance will be compensate.
As i understand at minimum DC volt what we get is Max primary inductance.
Formula used Vrefleccted=110V Fsw=100Khz Pi=14W Dmax=Vref/(Vref+VDCmin) Ip=2*Pin/(VDCminDmax) Lpri=VDCminDmax/(IpriXFsw)
Case 1:- When VDC=100V (Minimum DC) Dmax=0.5, Ip=0.53A, Lpri=0.9mH
Case 2:- When VDC=340V ( Normal Line) Dmax=0.24, Ip=0.33A, Lpri=2.4mH
So as DC bus volt goes up, require ind increase then why we calculate Inductance using minimum DC bus voltage.since all winding is fixed at low Vdc calculation.