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This paper proposes a method that can derive the current-type (C-T) DC-DC circuit topology from the voltage-type (V-T) DC-DC circuit topology by the duality of two-ports gyrator. In addition, the mathematical relationships between C-T DC-DC circuit and V-T DC-DC circuit parameters are established using the gyration resistance and the duty cycle of power switching device. Hence, C-T DC-DC parameters of the passive components, and the expressions of the mathematical relationships between the input and output, including the ripples of inductance current and capacitance voltage are obtained by analysing and calculating the V-T DC-DC circuit. Finally, the analysis results are verified by simulation in SIMULINK.

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