Dynamic wireless power transfer (DWPT) technology is emerging as a key enabler for in-motion charging of electric vehicles (EVs), allowing continuous energy transfer without the need for dedicated charging stops. This capability can reduce the required battery capacity and vehicle weight, thereby lowering the vehicle cost, extend battery life by minimizing deep discharge cycles, and support distributed charging that helps reduce grid peak loads. However, conventional receiver coil structures, such as the double-layered Double-D Quadrature (DDQ) configuration, require additional underbody space due to their two-layer winding structure, which limits their applicability in passenger EVs where the battery pack occupies most of the available area. To address this issue, a novel stackless onboard coil composed of four segmented coils is proposed. The midpoints of adjacent coil pairs are connected to create an additional current path, forming a composite magnetic structure within a single magnetic layer. This configuration eliminates the need for stacked windings and reduces the onboard coil thickness by 35% compared with conventional DDQ coils, while maintaining power transfer performance and efficiency without significant degradation. Theoretical analysis based on an equivalent circuit model, finite-element method, and dynamic circuit simulations was conducted to compare the proposed stackless and conventional DDQ systems. A 1.2 kW prototype with a 220 mm air gap was constructed, and experimental results confirmed continuous power transfer without a stacked structure. Compared with the DDQ coil, the proposed design increased the average output power by 13%, decreased the average efficiency by 1.8 percentage points, and improved power fluctuation by 21.5 percentage points. The proposed stackless coil is particularly suitable for passenger EV applications of DWPT systems, where minimizing the onboard coil thickness is prioritized over maximizing power transfer efficiency.

This paper presents an extended current control framework for grid-connected power converters based on a phase compensated multi-resonant controller. The proposed approach extends a previously introduced single-resonant control scheme proposed in [1] to a multi-resonant structure capable of compensating multiple harmonic components while maintaining robust stability under digital delay. Selective phase compensation is applied only to the final resonant term, avoiding anti-resonant effects commonly associated with full compensation schemes. To address practical implementation challenges, an artificial intelligence-based evaluation framework is introduced to automate the selection of discretization methods for individual resonant components, ensuring high-fidelity digital realization. The stability and performance of the proposed controller are analyzed using frequency-domain and stability criteria. Experimental validation is carried out on two different inverter topologies, namely a three-level three-phase T-type converter and a single-phase H-bridge inverter, demonstrating accurate current tracking, effective harmonic suppression, and robust operation under practical conditions.

This paper presents a proof of concept of a reconfigurable non-isolated DC-DC converter for connecting different energy sources and loads in a DC microgrid. Reconfigurable converters enhance redundancy, ease maintenance, and allow plug-and-play capability for converters for different power sources in DC microgrids. The proposed reconfigurable converter can operate as a unidirectional boost or buck converter or as a bidirectional converter. The proposed architectures offer the DC microgrid outstanding flexibility and can handle a variety of power flow circumstances effectively. Its bidirectional capacity enables a balanced and robust microgrid operation by facilitating energy exchange between battery storage systems and distributed loads. Simulation and experimental work confirm the effectiveness of the proposed converter in terms of dynamic response and justify the proof of concept of plug-and-play capability of the reconfigurable converter in the DC microgrid. This research highlights the converter's ability to meet the growing energy storage needs, renewable energy integration, and smart grid features, paving the way for scalable and environmentally friendly DC microgrid systems.

Efficient power management in Hybrid Energy Storage Systems (HESS) for off-grid PV inverters remains a challenge, particularly in terms of energy efficiency and battery degradation mitigation. In this context, this paper proposes a Model Predictive Control (MPC) based power management designed to mitigate Li-ion battery degradation while improving the overall system efficiency. To validate this proposal, extensive experimental results are presented. The proposed formulation aims to minimize battery stress by smoothing the current profile and reducing cycling effects. The performance of the MPC power management is verified through a comparative experimental analysis of four distinct strategies: rule-based, frequency-filtering, a benchmark MPC, and the proposed MPC. Evaluation is based on four key metrics: RMS current, total power losses, Equivalent Full Cycles (EFC), and State of Health variation (ΔSOH). Experimental results demonstrate that the proposed method outperforms the compared strategies across all evaluated criteria, significantly reducing battery stress in terms of cycling and current distribution. Furthermore, long-term simulations corroborate these findings, showing a substantial reduction in battery degradation compared to other established methods. These results confirm that the proposed method, provides a robust solution for mitigating battery degradation in hybrid inverter applications.

In this article, the hybrid dc-dc dual-path step-down topology is analyzed and selected for an automotive application due to its numerous benefits: it enables reduced inductor usage, which can be miniaturized, employs an auto-balanced flying capacitor, imposes limited stress on power switches, and offers, at the same time, a relatively wide conversion range. These features are achieved while maintaining the circuit complexity contained compared to many other competing hybrid topologies. A power loss analysis of the converter is carried out, which is exploited to obtain optimal sizing of the power stage and the inductor, and the chip architecture is described. Finally, the benefits of the topology are demonstrated experimentally through a highly-integrated prototype fabricated in 130nm CMOS technology, capable of converting an input voltage from the range 3.3-4.3V down to an output voltage in the range 0.7-1.2V, at a maximum power of 1.8W. The prototype, operating at a switching frequency of 2.5MHz, achieves a peak efficiency of 89.7% at a load current of 500mA, in a compact solution that features a power density of 1.73W/mm2.

In this paper, a novel all-solid-state impedance-matched Marx generator (IMG) is proposed that offers fast recharge times and, thus, high repetition rates with little impact on the output rise time. The topology consists of an inverted buck converter combined with a Marx generator. The proposed topology is primarily suitable for the generation of pulses with short pulse widths (e.g., 100 ns to 500 ns) and high repetition rates (e.g., higher than 1 kHz). Previous studies have shown that, for certain applications, such as air purification, shorter pulse rise times result in higher yields. Therefore, the proposed generator is optimized for a short output rise time through accurate stage timing and the utilization of an impedance-matched layout. Finally, a prototype capable of generating 4.65 kV, 95A pulses has been realized to validate the proposed topology. Results show that the generator can achieve a 10 kHz repetition rate when generating 100 ns full-load output pulses with an output voltage rise time of 8.57 ns. In addition, two iterations of the proposed IMG have been built to further improve the output rise time and enhance robustness against electromagnetic interference (EMI).

Active Thermal Control (ATC) strategies are increasingly used to improve the reliability and thermal performance of power electronic converters. Among these strategies, gate voltage modulation offers a way to influence the power losses without compromising signal quality. However, existing implementations often require multiple isolated supplies or modifications in high-voltage side circuitry, increasing complexity and cost. This work presents a Variable Voltage Supply (VVS) that enables gate voltage modulation without requiring signal isolation or changes to the gate driver high-voltage side. The circuit is based on a fixed-output flyback supply design, modified to allow multi-level programmability using primary-side regulation and a digitally controlled resistor network. This configuration enables microcontroller-based selection of four output levels (15 V, 17 V, 18 V, 20 V), with a voltage slew rate of 60 mV/<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathrm{\mu }$</tex-math></inline-formula>s. The added functionality results in a component cost of 12.41 €, representing an increase of 0.15 € compared to the original design. The circuit is compatible with both MOSFET and IGBT technologies, and can be directly integrated into existing converter platforms. The concept has been validated experimentally, and results confirm that increasing the gate voltage reduces steady-state junction temperature. In addition, the article also discusses the main limitations of the approach (e.g., increased short-circuit stress at high gate voltages) and outlines potential improvements including dual-polarity supply extension and closed-loop ATC strategies, among others.

The dynamics and performance of low-inertia ac grids with frequency support (e.g., droop and virtual inertia controls) have been investigated thoroughly. Recently, the dc grid concept has been considered a cost-effective and efficient option in modern power distribution systems, where one of its most valuable applications is to support the frequency and voltage of low-inertia and weak grids. However, the literature does not fully address a comprehensive stability analysis and performance assessment of a low-inertia system supported by a dc grid. Therefore, this paper presents a thorough yet straightforward dc-side impedance-based stability analysis of a low-inertia ac grid connected to a dc grid via a bidirectional voltage-source converter (VSC) equipped with a virtual inertia controller to improve the ac grid frequency behavior. In the proposed virtual inertia control, low-pass and high-pass filter implementations are investigated, and their performance is compared. The dc-side equivalent impedance models are developed for the 1) interlinking VSC combined with its ac grid, considering virtual inertia control and typical ac grid components: synchronous generators (with their turbine, governer, and exciter models), induction motor loads, and static loads, and 2) dc grid considering its practical components: distributed generators, constant-power loads, and resistive loads. Therefore, unlike previous methods, the proposed impedance modeling and stability analysis approach considers the impacts of the ac grid frequency/voltage dynamics and dc grid dynamics on the VSC dc-bus stability. Impedance interactions are characterized and used to assess the overall system dynamics and stability and the impacts of the system and control parameters. The analytical results are validated by detailed offline and real-time simulation studies.