Design, Analysis, and Implementation of a Transformer-less Step-up Converter with Continuous Input Current and High Voltage Gain Ratio

This paper proposes a high-step converter with reduced voltage and current stresses. This converter does not employ coupled inductors and transformers, reducing volume and weight besides eliminating leakage inductance issues. The low voltage and current stresses make it possible to employ low current/voltage rate semiconductors, resulting in a decrease in loss and expense. Moreover, switches turn ON/OFF simultaneously, leading to a simple switch drive circuit. The steady-state analysis is studied, including ideal voltage gain, current and voltage stresses, DCM, and CCM, besides converter loss and efficiency. In addition, the converters\u27 control procedure and frequency response are investigated, and recently introduced topologies are compared with the proposed converter. This converter uses fewer components than investigated topologies to achieve significant voltage gain at small duty cycle values. The experimental analysis verifies the theoretical relations and the converter performance

A Single-Phase High Gain Active-Switched Quasi Z-Source NNPC Inverter

Impedance source-based multilevel inverters have recently gained popularity for new renewable energy sources. This study describes a quasi Z-source (qZS) based single phase five level nested neutral point clamped (SL-NNPC). Compared to previous topologies, the suggested qZS, which uses active switches, has input continuous current and common ground between the input dc source and the converter\u27s output dc source, which is the same as the inverter\u27s input dc link. In addition, this converter features a high voltage gain and low voltage stress on the switch and diodes. To regulate the flying capacitor voltages and consequently the inverter\u27s output current, the Model predictive control (MPC) method for the 5L-NNPC inverter is implemented