A High Step-Up Transformerless DC-DC Quadratic Boost Converter using Voltage-Lift Switched Inductor and Voltage Multiplier

This paper presents a high conversion ratio transformerless dc-dc converter based on a quadratic boost using voltage lift switched inductor and voltage multiplier cell (QBVLVM). The QBVLVM has a voltage lift switched inductor and voltage multiplier cell to increase the voltage conversion ratio. QBVLVM provides an eight times higher conversion ratio at a duty cycle of half with diminish peak voltage across the active switch than a conventional boost converter. The operation of QBVLVM is analyzed through different modes. A detailed mathematical analysis for each mode of operation is presented, along with the consideration of series resistance of inductance. Evaluation with previous converters existing in the literature, QBVLVM put forward higher conversion ratio. The output voltage of QBVLVM is maintained at the desired level by implementing a dual-loop control strategy based on a PI controller. The operation of QBVLVM is examined under load interruption and sudden shift in supply voltage. The viability of the QBVLVM is examined by Matlab simulink results.