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To overcome the problems associated with Z‐source‐based DC–DC converters, a quasi‐Z‐source (QZS)‐based high‐gain DC–DC boost converter with switched capacitors is proposed in this work. Z‐source‐based DC–DC converters have problems like low‐voltage gain, discontinuous input current, and high‐voltage stress on the active and passive components. The proposed converter can produce a high‐voltage gain of more than 10 times for a duty cycle of less than 0.5. The converter has other desirable features like reduced voltage stress across the switching components and continuous input current (CIC). It comprises a QZS cell made up of switched inductors and a voltage multiplier cell (VMC) made up of switched capacitors. The power loss analysis is done using PLECS software by incorporating the real parameters of switches and diodes from the datasheet. A hardware prototype of 200 W is developed in the laboratory to verify the working of the converter. In experimental results for an output power of 200 W, the converter is operated with a source voltage of 33 V at a duty ratio of 0.4 providing an output voltage of 395 V. The converter performance is good in open‐loop conditions and is verified through experimental results. [ABSTRACT FROM AUTHOR]

Summary: In this paper, a modified and improved high gain dc–dc boost converter is proposed. The converter has utilized two voltage multiplier cells (VMCs) comprising switched capacitors (SC) and switched inductors (SL) to increase the voltage gain of the converter. The basic concept of these switched topologies is that when the switch is ON, the energy is stored by the inductor and the capacitor transfers its energy to load and inductor. In the OFF cycle, the inductor transfers its energy to the capacitor, and, simultaneously, capacitor is charged through input voltage also. As compared to other nonisolated topologies, the proposed converter has a high voltage gain and low voltage stress across semiconductor devices. The voltage stress on all capacitors except the output capacitor is less than the voltage across the load. A detailed analysis of the converter in continuous conduction (CCM) and discontinuous conduction modes (DCM) is shown. The proposed converter has a peak efficiency of 94.8%. For the efficiency calculation of the proposed topology, PLECS software is used. The experimental results agree with the theoretical analysis and validate the working and performance of the proposed converter. [ABSTRACT FROM AUTHOR]

This paper presents three new and improved non-isolated topologies of quadratic boost converters (QBC). Reduced voltage stress across switching devices and high voltage gain with single switch operation are the main advantages of the proposed topologies. These topologies utilize voltage multiplier cells (VMC) made of switched capacitors and switched inductors to increase the converter's voltage gain. The analysis in continuous conduction mode is discussed in detail. The proposed converter's voltage gain is higher than the conventional quadratic boost converter, and other recently introduced boost converters. The proposed topologies utilize only a single switch and have continuous input current and low voltage stress across switch, capacitors, and diodes, which leads to the selection of low voltage rating components. The converter's non-ideal voltage gain is also determined by considering the parasitic capacitance and ON state resistances of switch and diodes. The efficiency analysis incorporating switching and conduction losses of the switching and passive elements is done using PLECS software (Plexim, Zurich, Switzerland). The hardware prototype of the proposed converters is developed and tested for verification. [ABSTRACT FROM AUTHOR]