(10-20)VTonN☆ To avoid the core from saturatingtmmax must less than (1-D)TVD21i1D07(10-21)maxN3+tm1+YN.1m☆ Typically, N3=N1. therefore Dmax=0.511
1 2 N3 N1 v T = ( 1 + ) Vd 1 m on N t = N3 t (10 - 20) (10 - 21) N 1 1 + N 3 Dmax = on = ton + t m t 1 ☆ Typically, N 3=N 1 . therefore Dmax=0.5 ☆ To avoid the core from saturating, tmmax must less than (1 -D)Ts. v 10 t d V t on t off T S ttttt t m v T Vo 0 vD20i10 im0iL0 d N 3 − N 1 V N 3 N 1 Vd N 2 V d V + d N 1 V d
Whathappens whenD>0.5?iMOD<0.5imwill“runawayover time andD>0.5saturatethecoreDT.D,T2T
13 What happens when D >0.5 ？ iM will “run away” over time and saturate the core