(a) (b)
Fig. The voltage gain versus the
duty cycle with various turns ratio under (a) step-up and step-down
mode; (b) step-down mode.
(a) (b)
(c) (d)
(e)
Fig.
Experiment waveforms under boost mode at Vin =
15V, Vo = 48V and Po =
100W (a) Vgs 1,Vgs 2,Vds 1, iL1 ;
(b) Vgs 1,Vds 2, iLk ;
(c) Vgs 1,VD 1, iD1 ;
(d) Vgs 1,VD 2,iD 2; (e)Vgs 1,VD 3,iD 3.
(a) (b)
(c) (d)
(e)
Fig. Experiment waveforms under
boost mode at Vin = 75V,Vo = 48V and Po = 100W (a)Vgs 1,Vgs 2,Vds 1, iL1 ;
(b) Vgs 1,Vds 2, iLk ;
(c) Vgs 1,VD 1, iD1 ;
(d) Vgs 1,VD 2, iD 2;
(e) Vgs 1,VD 3,iD 3.
(a) (b)
Fig. Closed-loop experimental
results in (a) Boost mode; (b) Buck mode.
(a) (b)
Fig. 11 Block diagram of power
losses distributions in (a) step-up mode (b) step-down mode.
Fig. The curves of measured
efficiency versus output power in both step-up and step-down modes.