In this study, the performances and features of a two-phase converter with low switch voltage stress and its derivative converters are investigated thoroughly. As compared with the traditional boost converter, the voltage stresses of switches and diodes of the two-phase converter are much lower; thus, the switches and diodes with lowvoltage ratings can be used, which reduces the conduction losses. Moreover, the switches are not floating, and the input and output terminals have common ground; hence, no isolated driver is required. In addition, by utilising the ampere-second balance principle, the proposed converter can achieve current sharing without any extra control circuit, leading to simple circuit structure. In the two-phase converter, the capacitors are used not only to realise automatic current sharing but also to further improve the voltage gain. In addition, because of the advantages of the two-phase converter, many types of converters are derived from the two-phase converter. Eventually, the operating principles, mathematical deductions and experimental results for the two-phase converter are given to provide its effectiveness.

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In this paper, a novel step-up converter is presented, where the charge pump concept, combined with the traditional boost converter structure, is utilized. Although two inductors are used in such a converter, the difference in value between the two inductors affects the regulation performance of this converter slightly. Furthermore, the behavior of this converter is similar to the traditional boost converter, and hence, the control of this converter can be realized easily. Above all, the energy stored in the two inductors, connected in series with the energy stored in the charge pump capacitor and the input voltage, is released to the load during the demagnetization period. In this paper, the basic operating principles of the proposed converter are presented along with some experimental results to demonstrate the effectiveness of this converter.

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