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A negative-output high quadratic conversion ratio dc-dc converter with dual working modes is proposed. One working mode is a step-up mode, and the other is a step-up/step-down mode. Analysis of the circuit principle and different operation modes, steady-state calculation, and small-signal modeling are presented. Comparisons of the proposed converter with other converters demonstrate that the proposed converter has a higher conversion ratio in its two working modes and, under the same voltage gain, the proposed converter in the second working mode has the lowest switching device power rating, a higher efficiency, and small peak-to-peak value of input current. Simulation results based on PSpice and circuit experiments are given to verify the effectiveness of the proposed converter.
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Li et al. (2018) studied this question.
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