This paper presents a study of a new topology of a DC–DC converter titled double quadratic boost non-isolated. This converter has high static gain and proposes to reduce the voltage stress on the switches, where the maximum voltage value at each switch is equal to half of the total output voltage. The paper first presents the theoretical analysis of the converter operating in open loop. The objective of the work is the mathematical modeling and control strategy of the converter, as well as validation through closed loop experimental results. In addition, we present the results of practical tests to demonstrate the operation of the converter, such as the experimental static gain curve, the practical efficiency of the converter, and the output voltage control, as well as the capacitor voltage swing control. The authors designed the prototype for 1 kW, with a switching frequency of $f_s=50$ kHz, with FPGA-based control and modulation.

This article presents the study and implementation of a three-phase three-level preregulator rectifier with digital control using a DSP. A synchronizing circuit (DPLL - digital phase locked loop) tracks continuously the fundamental frequency of the system voltage. This digital PLL circuit determines the frequency and phase angle of the fundamental positive-sequence component of the measured signals to the phase voltages. The converter structure has a common capacitive center point that allows the three-level operation and a low blocking-voltage stress on the power switches (half of delink voltage). The reduction of blocking voltage allows the use of low cost and low losses power devices, increasing the efficiency and the power density with reduced production cost. The control technique used aims to obtain power factor correction (PFC), regulated and balanced output voltages. With the advance of DSP controllers, digital control is increasingly used in power converts systems and offers a number of advantages like more flexibility in modification code and less sensitive to noise. However, sampling time delay, resolution of A/D converter, word length of DSP and instructions cycle time are disadvantages over analog control. Nowadays, control optimized DSP's deliver high performance, great code efficiency and optimal peripheral integration for the digital control with high level on-chip integration to deliver system cost reduction, and powerful computational abilities that enable software innovation then reducing disadvantages of a digital control. The DSP used is the ADMC401 from analog devices.

This paper presents a nonisolated multilevel step-down dc-dc converter suitable for high voltage application. The main features of this topology are: low voltage across the semiconductors; low switching losses and reduced volume of output filter. This paper focuses on the five-level structure of the proposed converter, in which the theoretical analysis is carried out and discussed. The five-level proposed dc-dc converter has four capacitors and their voltages should be balanced for its correct operation. Therefore, a capacitor voltage balancing active control is presented and analyzed in detail herein. In order to demonstrate the performance of this converter, experimental results for a prototype of the 700-V input voltage to 450-V output voltage, 5-kW rated power and switching frequency of 20 kHz are reported herein.

This work presents a novel five-level hybrid Half-Bridge/ANPC multilevel inverter. Along with the switching states possibilities, employed modulation techniques, conduction losses analysis, and simulation results from a three-phase topology, it is presented the experimental results from a monophasic structure, operating with 1020Hz switching frequency, output frequency of 60Hz, phase output voltage of 220Vrms, output power of 2.3kW and power factor of 0.92. From the presented results, it can be noticed the reduced losses and better harmonic content.

This article proposes the study, control and analysis of the topology of an AC–AC modular multilevel converter, known in the literature as the Hexverter. The Hexverter is capable of converting the energy between two AC systems with a reduced number of elements, if compared with other modular multilevel topologies, which makes this topology attractive in AC–AC applications. However, there are few studies about the Hexverter in the literature, so this work presents its operation principle, conducts modeling, and proposes a control scheme for the converter’s proper operation, validating the operation and control via hardware-in-the-loop emulation.

This study endeavors to optimize a dual active bridge (DAB) converter for seamless integration into an electric vehicle's on-board charger (OBC). The optimization process employs an algorithm to ascertain the optimal construction parameters, encompassing factors such as the number of turns in the inductor, gap length, and the number of turns in the primary and secondary windings of the transformer. By considering seven meticulously chosen operating points, the objective is to minimize the total loss sum and pinpoint the optimal frequencies for each point. Subsequently, a lookup table is formulated to ensure efficient OBC operation across varying output power and current levels by optimizing the frequency as a single variable. To validate the optimization process, the power switch losses are compared with theoretical calculations, and simulation results from PLECS 4.7.2 are leveraged. Furthermore, a prototype is meticulously assembled and tested to validate the DAB converter optimization, ultimately achieving an impressive efficiency of over 97 %, thus affirming the efficacy of the optimization algorithm.