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According to the timing diagram of Fig. 3(a), the converter goes cyclically through the topologies shown in Figs. 3(b) and 3(c). It can be noted that S is operated as in any classical boost converter: in the rst topology, the boost in- ductor Lin is charged from the source. In the second topology, the line and Lin's energies are transferred to the capacitor and load. Thereby S acts as in a classical boost converter control: it controls the energy transfer through Lin. The change of the conguration of the SC circuit (parallel-series connection of the capacitors) is a derivative of the action of S, no control being imposed on charging/discharging C01 更多：https://www.bmcx.com/ , C02. As a result, the SC circuit can operate at its maximal theoretical eciency (only the conduction losses on the parasitics of C01, C02, S and forward voltages on the diodes in conduction aect the eciency of the SC circuit). The eciency of the proposed circuit is that of a classical boost converter. For a steady-state cycle, VLin = Vin in the rst conguration and VLin = Vin