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A High Step-Up Multi-Mode Resonant Switched-Resonator Converter

Switched-resonator converter is one of the feasible options to achieve high power density and efficiency. The existing switched-resonator converters have limited voltage boosting capability. The output is further boosted by cascading conversion stages. Therefore, a high step-up switched-capacitor converter based on the multi-resonant and multi-mode operation is proposed in this article. The multi-resonant operation helps reduce switching losses in some switches because of the zero-current-switching. The converter output voltage is regulated in a wide range, modulating the pulse-width of the control signals using the multi-mode operation. It avoids challenges when designing a power converter system based on switching frequency modulation. The converter has a linear relationship between the duty ratio and voltage gain that cannot be observed in other switched resonator step-up converters. These properties of the converter are analyzed and validated using experimental results.