Abstract
Recently, switched inductor (SI) and switched capacitor techniques in dc-dc converter are recommended to achieve high voltage by using the principle of parallel charging and series discharging of reactive elements. It is noteworthy that four diodes, one high-voltage rating switch, and two inductors are required to design classical SI boost converter (SIBC). Moreover, in classical SIBC, the switch voltage stress is equal to the output voltage. In this article, modified SIBC (mSIBC) is proposed with reduced voltage stress across active switches. The proposed mSIBC configuration in this article is transformerless and simply derived by replacing the one diode of the classical SI structure with an active switch. As a result, mSIBC required low-voltage rating active switches, since the total output voltage is shared into two active switches. Moreover, the proposed mSIBC is low in cost, provides higher efficiency, and requires the same number of components compared with the classical SIBC. The continuous conduction mode and discontinuous conduction mode analysis, the effect of nonidealities on voltage gain, design methodology, and comparison are presented in detail. The operation and performance of the designed 500-W mSIBC are experimentally validated under different perturbations.
Highlights
I N THE recent past years, attention toward the utilization of renewable energy sources to produce electricity has considerably increased throughout the world
The proposed dc–dc converter utilizes the inherent switched-inductor technique to achieve high step-up voltage gain
The modified SIBC (mSIBC) converter is designed by considering the typical input voltage of 100 V, output power of 500 W, output voltage of 400 V, and switching frequency of 100 kHz to validate functionality and performance
Summary
I N THE recent past years, attention toward the utilization of renewable energy sources to produce electricity has considerably increased throughout the world. Coupled-inductor-based topologies can provide a solution to attain high voltage gain with or without isolation; additional clamped circuitry and input filter are required to reduce ripples and leakage inductor energy recovery schemes which increases the cost. In order to reduce voltage and current stresses on the active switches and to attain a higher step-up voltage gain without a high duty cycle, converters topologies are proposed in [19]–[21]. High-gain and double-duty triple-mode converters are proposed to achieve higher voltage gain without utilizing transformer, coupled inductor, voltage multiplier, and multiple voltage lifting techniques [22], [23]. The major drawbacks of these converters are their complex control algorithm because of the utilization of two duty cycles and the use of three switches, which increases complexity, size, and cost These converters are suitable only for floating output.
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