Analysis and design of zero-voltage switching high gain interleaved boost converter

Analysis and Design of the Soft-Switched Clamped-Resonant Interleaved Boost Converter

“…All currents have a zero average value, as consequence of a zero output power. The resonant voltage waveform is described by (5), and the sub-interval duration is given by (J C0nl = J L0nl -J m0nl ): (16) which gives (17) The peak of the resonant voltage occurs exactly at θ c /2 and, in order to have a zero energy transfer to the output, the condition that needs to be satisfied is (18) Using (18) and (16) into (5), the following condition is found: Assuming the inductance ratio λ is known, from (19) angle θ c is found, and from (16) the initial condition J C0nl is calculated as (20) Using (3) and (16) together with the condition j m (θ c /2) = 0, the initial condition J m0nl results: (21) Then, the input inductor current initial value is derived from (22) The switching frequency, in this situation, reaches its maximum value given by (23) where the overlapping angle θ ov = ω r T ov is calculated imposing a steady-state condition for the input inductor current. In fact, from Fig.…”

“…Moreover, the resonant transitions, as well as the effect of the input inductors in the resonance mechanism, are ignored. The same approach was applied to an interleaved boost converter in [16], to the interleaved boost/flyback converter in [17] and to the interleaved boost converter with an asymmetrical voltage doubler rectifier in [18], [19]. Paper [16] proposes a variable frequency control, while papers [17]- [19] claim the possibility of using the duty-cycle to control the output voltage at constant switching frequency, which is not possible, as it will be proved in the converter analysis reported in the following sections.…”