Single-Switch Resonant Soft-Switching Ultra-High Gain DC-DC Converter With Continuous Input Current

An ultra-high gain DC-DC converter with single-switch structure is introduced in this paper. Full soft-witching is provided by simultaneous use of quasi-resonant performance of one resonant tank and leakage inductance of a three-winding coupled inductor (CI). Adopting the secondary and tertiary windings of the CI in separated voltage multiplier cells enables the converter to provide ultra-high voltage gain. The reverse recovery problem is resolved thanks to the quasi zero current switching performance of nearly all diodes, especially output diode because of the second resonant tank, so the total electromagnetic interference is significantly reduced. Continuous input current with low ripple expands the application of the proposed converter, especially in renewable energy applications. Steady-state performance and design considerations of the introduced converter are analyzed thoroughly and compared with recently introduced converters to establish its merits. Experimental results of a 200 W prototype are given to validate its analysis and performance.

Automated summary

This paper introduces an ultra-high gain DC-DC converter with a single-switch structure, which achieves full soft-switching and ultra-high voltage gain by utilizing the leakage inductance of a three-winding coupled inductor and the quasi-resonant performance of a resonant tank. The converter solves the reverse recovery problem and reduces electromagnetic interference significantly by employing quasi zero current switching performance. It also provides continuous input current with low ripple, expanding its application in renewable energy applications.