A versatile zero ripple topology

The Fourth‐Order Converter – Superbuck

“…These values are also the commonly defined zero-input-ripple conditions [2][3][4]. These values are also the commonly defined zero-input-ripple conditions [2][3][4].…”

“…The mode boundary between the CCM and DCM conduction modes would take place [4], when the output current equals the half the sum of the inductor-current peak-to-peak ripples (10. 6) or…”

“…[4] actually claims that the dynamics of the PCM-controlled superbuck converter can be obtained from the dynamic representation of the conventional buck converter by replacing the output inductor with the parallel inductor L p = L 1 L 2 /(L 1 + L 2 ), but this claim does not hold because of the resonant behavior in the input dynamics and the possible appearance of the RHP poles and zeros. [4] actually claims that the dynamics of the PCM-controlled superbuck converter can be obtained from the dynamic representation of the conventional buck converter by replacing the output inductor with the parallel inductor L p = L 1 L 2 /(L 1 + L 2 ), but this claim does not hold because of the resonant behavior in the input dynamics and the possible appearance of the RHP poles and zeros.…”

“…Several other topological alternatives to implement the desired feature are available as described in [9] of which the buck-like converter known as stepdown, current-sourced buck, two-inductor buck or superbuck has become a popular choice especially in the solar energy applications [4,5,11] (Figure 10.2). Its static and dynamic features greatly resemble those of the conventional buck converter introduced earlier in Chapters 3 and 4.…”

“…Its static and dynamic features greatly resemble those of the conventional buck converter introduced earlier in Chapters 3 and 4. The input-current ripple can be further reduced by using coupled-inductor design [12][13][14][15] as demonstrated in [2][3][4]. The appearance of those anomalies would greatly affect the controller design and obtainable transient dynamics [16,17], but they can be controlled by means of the power-stage design.…”