Enhanced Self-Lift Cûk Converter for Negative-to-Positive Voltage Conversion

This letter introduces a new step-up dc-dc converter that provides a negative-to-positive voltage-conversion path for the negative dc-voltage source. Compared with the classical Cûk and buck-boost converters, the proposed converter increases the voltage boost ability significantly using the switched capacitor and self-lift techniques. It is featured with single power switch operation, common ground, transformerless structure, and clear energy delivery process; therefore, the relative simple structure is beneficial to potential industrial applications in future. A detailed theoretical analysis for the continuous and discontinuous conduction modes is given, and the main general aspects for circuit design are derived. A preliminary system modeling based on the flow graph is also presented for reference. Both simulation and experimental results are provided to validate the analysis results.