This paper introduces a new self-balancing buck PFC Multilevel Rectifier based on a five-level Switched Capacitors (SCs) architecture. The proposed design offers a broad range of output voltage, enabling operation with various loads and accommodating both single and double/dual output modes. Additionally, it ensures effective load voltage balancing, even when the both loads have different values. The rectifier functions in buck operation mode and provides extensive output voltage regulation, making it suitable for simultaneous electric vehicle (EV) battery charging. To evaluate the performance of proposed rectifier this paper explores the operating principle, modulation strategy, closed-loop control, and experimental validation with same and different load variation scenarios.

Power electronics is an emerging and rapidly advancing technology within the realm of electrical engineering, finding wide-ranging applications in areas such as renewable energy, electric vehicles, and industrial automation. This paper aims to provide an in-depth exploration of the tools employed for comprehending power electronics technology. A notable aspect of this paper is its systematic approach, guiding students through a sequential progression of design, hardware implementation, and procedural steps for a series of power electronic circuits. Moreover, the paper elucidates the various tools, software, and their respective applications in the power electronics domain, contributing to a comprehensive understanding of the field.

In the present study, we propose a novel high-order weighted fuzzy time series (FTS) forecasting method using k-mean clustering, weighted fuzzy logical relations and probabilistic fuzzy set (PFS). Objective of proposed forecasting method is to handle occurrence of recurrence of fuzzy logical relations and both non-probabilistic and probabilistic uncertainties in assigning membership grades to time series datum. The proposed PFS-based forecasting method uses Gaussian probability distribution function to assign probabilities to membership grades. Proposed FTS forecasting method uses high-order weighted fuzzy logical relation in which each fuzzy logical relation uses the weight in ascending order. Superiority of proposed method is shown by implementing it on SBI share price at BSE, India and University of Alabama enrollments. Error measures and statistical parameters, for example, coefficient of correlation, coefficient of determination, performance parameter, evaluation parameter and tracking signal are also used to confirm the outperformance and validity of the proposed PFS-based forecasting method.

Multilevel inverters are gaining importance in industrial applications, so new topologies are being proposed, particularly for increasing the number of levels while minimizing the number of power switches. This paper proposed a switched capacitors-based multilevel inverter topology with a level doubling network (LDN) to almost double the output levels. The LDN is simply a capacitor-fed half-bridge structure with self-regulating capacitor voltage. The proposed topology can generate nine-level at the output by using nine switches to achieve a system’s low cost. A switched capacitor in the proposed topology is self-balanced without any additional circuit. It uses only one input source to attain a voltage gain of two. A simple modulation scheme is used to keep switched capacitor balanced at all modulation values. The circuit’s operation is validated using MATLAB/Simulink simulation and experimental results.

This article presents a switched capacitor (SC) voltage boosting inverter and its carrier based modulation strategy. A switched capacitor unit (SCU) is connected to the conventional three-phase bridge inverter to obtain the increased voltage at output. Modified sinusoidal pulse width modulation (SPWM) is used that increases utilization of DC source and the linear operating range of the inverter. Additional references are synthesized for switched capacitor unit modulation. Only single carrier signal is used for comparing and signal generation. Boosting of the inverter can be controlled by manipulating the additional references. Voltage elevation is obtained at intermediate durations resulting in less charging current in capacitor loops. Number of SCUs can be added to conventional voltage source inverter (VSI) for multi-fold voltage augmentation. However, inverter with only one SCU at front end is analysed in this work. Designing of the capacitor is also presented for proposed work. Simulation is performed using MATLAB/SIMULINK and experimental verification is also done. The Switched capacitor inverter helps to get rid of the inductor for boosting the voltage, thus, make the system less bulkier. The proposed work can be retrofitted in existing conventional three phase bridge inverter. The SC-VSI can be used for various low to medium voltage applications,i.e., electric vehicles, photovoltaic, battery energy storage system etc.

Now a days, flickering in LED is a challenge for researchers as it has adverse effect on human health. Using electrolytic capacitor was the initial solution for flickering. However, electrolytic capacitors are not preferred for LED driver owing to short lifetime and more prone to fault. There exists several ripple cancellation (RC) techniques discussed in literature. However, they suffer from complex control structures and high stress across the switches. In this regard, this paper proposes a novel series current RC method to eliminate the double line low frequency ripple and also have removed the electrolytic capacitor. The key features of the proposed RC method include UPF operation throughout without any external circuitry by using the multilevel converter, simple control and reduced smoothing capacitance value. The validation of the proposed method in simulation has been presented.

The maximum amount of load demand is supplied through batteries instead of a PV array for standalone applications in rural areas. This demands proper and equal battery source utilization for multilevel inverters (MLIs) with multiple sources for maintaining a better life of the battery. In this regard, a two-source nine-level MLI topology with the characteristics of equal source utilization is proposed. The number of voltage levels further increased either by increasing the number of switches or cascaded connection of the cell for improving the quality of the waveform. The proposed topology has the capability of equal voltage source utilization, which increases the balance in the charge of batteries by proposing a new switching method for generating gate pulses. The effectiveness and robustness of the developed topology are carried out under various operating conditions in the Simulink environment. Finally, an experimental test bench of the developed topology is built and the acquired experimental results validate the simulation results.

A cascaded H-bridge multilevel inverter offers important advantages over the conventional two-level topologies, though it necessitates isolated input dc sources. Even power distribution amongst these sources is an important control issue for an enhanced life-time of the overall system. In currently used control schemes, for `n' number of input sources and a fundamental period `T' for the output voltage, average power drawn from each source become equal after cyclic time spans of `n*T'. In this paper, a methodology is presented using which these spans are reduced to `T', irrespective of the number of input sources. In the proposed scheme, sine-triangle pulse-width-modulation (SPWM) technique has been espoused to obtain a `multilevel reference signal'. This signal is further manipulated, so as to impart flexibility for the selection of redundant states. Actual driving signals for the power switches are then derived from the manipulated multilevel reference signal, utilizing chosen states such that the respective average currents drawn from the input sources are repeatedly equalized within one power cycle of the output voltage. Such flexibility is not directly offered by the standard multilevel SPWM methods. Simulation and experimental results indicate that for two input sources and an output voltage of 50 Hz, the conventional `carrier rotation' scheme requires repeated time-spans of 0.04 sec for even power distribution whereas the proposed scheme requires only 0.02 sec. Thus, the proposed scheme leads to a better and effective utilization of sources, especially when the number of input sources is large.