Abstract
Fourth-order converter known as superbuck converter is used in the applications requiring continuous input current such as interfacing solar generators or improving power factor of a converter. Peak-current-mode control is used to reduce the resonant behaviour of the converter for facilitating the control design. The input-current ripple can be reduced substantially by applying coupled-inductor technique. The paper investigates the dynamic effects the application of the coupled-inductor technique causes in a superbuck converter. The dynamic features of the higher-order converters are usually not well known due to the complexity of the analysis. The coupled-inductor technique further increases the complexity and therefore, its real dynamic effects are not properly analyzed. The investigations show that the peak-current-mode-controlled superbuck converter with coupled inductors will become almost useless even if the original converter has features resembling that of an optimal converter. Experimental evidence is provided to validate the theoretical findings.
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