(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.