Output Voltage Ripple Analysis and Capacitor Sizing in a Four-Switch Buck+boost Converter under ZVS Modulation Strategies
Guangyao Yu (TU Delft - DC systems, Energy conversion & Storage)
Jianning Dong (TU Delft - DC systems, Energy conversion & Storage)
Pavol Bauer (TU Delft - DC systems, Energy conversion & Storage)
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Abstract
This article investigates the peak-to-peak output voltage ripple for the four-switch buck+boost (FSBB) converter under four-segment inductor current mode zero-voltage switching (ZVS) modulation strategies in a comprehensive way. Based on the operating mode of the FSBB converter and the relative magnitudes of the output current and inductor current at the switching instants, four distinct cases were analyzed, with corresponding voltage ripple expressions derived for each. The analysis presented in this article provides theoretical guidance for the selection of output capacitor size of the FSBB converter under ZVS modulation strategies. In addition, the introduced analytical method was also used to evaluate and compare the output voltage ripple under three state-of-the-art ZVS modulation schemes. To validate the theoretical analysis, two sets of simulations were conducted. Finally, a laboratory FSBB converter prototype was also built and tested for the validation purpose with an input voltage of 150 V, output voltage of 200 V, and operating power of 1.2 kW.
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