High-efficiency and high-power-density point-of-load (POL) converters are critical for data center power supplies. Although hybrid resonant switched-capacitor (ReSC) converters can substantially reduce the volume of passive components, they often suffer from severe efficiency degradation when the switching frequency mismatches the resonant frequency due to component tolerances. To address this challenge, this paper proposes a parameter-mismatch insensitive cascaded POL converter by integrating a BUCK stage with a cascaded voltage divider (CVD). By introducing an auxiliary resonant branch, a multi-resonant operation is established, enabling the residual inductor energy caused by component variations to be transferred to the output during the dead time with virtually eliminated hard-switching losses. Consequently, precise matching between the switching frequency and the resonant frequency is no longer mandatory. A 12 V-to-1 V/30 A GaN-based prototype was developed to validate the theoretical analysis. Experimental results demonstrate that the proposed converter maintains high efficiency under a ±10% component variation and achieves robust voltage regulation and fast transient response, making it highly suitable for high-current data center applications.
This paper introduces a new non-isolated step-up DC-DC converter based on a switched-capacitor-inductor (SCI) network that achieves high voltage gain at modest duty cycles. The proposed topology is distinguished by several simultaneous merits: low voltage stress on all power switches and diodes, a common ground between the input and output ports, continuous input current, and a superior gain-per-component ratio with respect to inductors, capacitors, and diodes. Thanks to the reduced semiconductor voltage stress, switching losses are mitigated, and the converter can employ lower-voltage active devices, which are inherently more efficient and cost-effective. The converter also features an inherently modular multi-stage structure, allowing it to scale to higher voltage and power levels without proportionally increasing semiconductor stress, which is an advantage over conventional quadratic or coupled-inductor-based high-gain designs. The paper presents a comprehensive steady-state analysis in both continuous (CCM) and discontinuous (DCM) conduction modes, derives the voltage gain and component stresses, and provides a detailed comparative evaluation against state-of-the-art step-up topologies in terms of voltage gain, semiconductor stress, component count, and efficiency. A 400 W laboratory prototype with 48 V input and 400 V output, operating at 25 kHz, was built and tested. Experimental results confirm the theoretical analysis and demonstrate a measured efficiency of 94.9%.
M. Yavari, A. Salemnia, Hamid Javadi et al.· Scientific Reports· 0 citations
A DC–DC power conversion topology based on a single controlled switch and high voltage elevation is developed, employing magnetic energy transfer and an integrated passive clamp to mitigate the voltage stress on the MOSFET. Operating at a duty cycle of 41.7%, the converter achieves an output–input voltage ratio of 16.67, stepping up from 24 V to 400 V. The proposed topology overcomes key limitations of conventional converters, including high losses at large duty cycles and excessive component counts in cascaded architectures. Comprehensive steady-state operation, voltage and current stress evaluation, power loss assessment, and passive component design are analytically investigated. Comparative evaluation with existing high step-up topologies and simulation validation are also presented. Simulation results under a 300 W output power condition demonstrate a peak efficiency of 95.44% and low output voltage ripple. The outcomes support the analytical framework and indicate the suitability of the proposed converter for real-world applications requiring stable high-voltage DC conversion from low-voltage sources.
Thai Anh Au Tran, Xuan Khanh Ho, Hoai Khanh Ly Le· E3S Web of Conferences· 0 citations
The integration of variable photovoltaic and wind energy into renewable power systems has created a high demand for high-frequency converters that achieve low switching loss, reduced thermal stress, and stable output regulation. In the case of conventional hard-switching converters, turn-on and turn-off losses are significant at higher switching frequencies, resulting in electromagnetic interference (EMI) and device stress. The objective of this work is to devise a soft-switching power converter structure comprising photovoltaic and wind inputs together with resonant energy transfer, transformer isolation, output filtering and aggregation leveraging coordinated Pulse-Width Modulation (PWM) and frequency. Here, Zero Voltage Switching (ZVS) is attained for the primary switch and Zero Current Switching (ZCS) is reached for the auxiliary switch using a resonant inductor–capacitor network. The 5-kW converter operates from a nominal 300 V input, regulates to a 400 V output and switches at 100 kHz with resonant inductance of ${2 0}~{\mu} \mathrm{H}$ and resonant capacitance of 126 nF. Compared to conventional switching ($94.7\%$ and $93.8\%$, respectively), simulation results demonstrate peak efficiency of $97.3\%$ and rated-load efficiency of $97.0\%$. The result yields a switching loss of 126 W down to a final value of 38 W and a total estimated loss reducing from 297 W to a peak of 190 W in balance-of-systems loss metrics conducive for use in photovoltaic–wind hybrid generation systems, distributed renewable plants, battery interfaces, microgrids, and more effective grid-connected power conversion with enhanced thermal- and electromagnetic-response performance under variable renewable conditions across realistic operating ranges.
Muthukumar Paramasivan· International Conference on...· 0 citations
This article introduces a novel ultra-high voltage gain DC-DC converter with a low component count, designed for renewable energy applications. In the presented topology, a three-winding coupled-inductor (TWCI) and a switched-capacitor network are embedded within a classic quadratic boost converter. This arrangement yields high voltage gain, ensures continuous low-ripple input current, and preserves a common ground between the source and the load. Due to its trans-inverse feature, the circuit achieves ultra-high voltage gain even with a very low turns ratio in the TWCI. The topology also features current sharing between the TWCI and the main power switch, which significantly reduces power losses in the main power switch and coupled-inductor device. To limit voltage stresses on the active switches, the circuit integrates two passive regenerative clamp circuits, with the switches themselves operated using simultaneous switching patterns. The paper provides detailed steady-state analysis, power loss calculations, comparative evaluation, and design considerations. Finally, a laboratory prototype rated at 200 W has been implemented to verify the theoretical analysis, achieving a very high voltage conversion from 20 V input to 400 V output.
Power electronics converters that are high-performance and efficient are essential to the production of power from renewable sources. Nevertheless, low-voltage generation poses a serious challenge for electric vehicle applications utilizing renewable power sources like solar, fuel cells, etc. For this reason, high-gain (HG) DC-DC converters with low duty cycle variation are seen to be crucial for the use of EVs powered by renewable energy. This research presents a novel HG converter using the switched-inductor and voltage lifting approach. The suggested circuit uses a single switch to achieve an impressive voltage gain of approximately 8 times at 60% duty ratio while putting minimal voltage stress on the components. In both continuous and discontinuous conduction modes, the suggested circuits steady-state analysis is described. A design approach with an emphasis on components is examined, and it is compared extensively with state-of-the-art topologies. The performance of the proposed high-gain DC-DC converter with the nonlinear gain compensated PI voltage control (NGC-PI) based control strategy is evaluated under various operating conditions. A prototype of a 200W converter is tested in the lab with an input voltage of 24 V DC. The real-time performance and efficacy of the proposed converter are in line with analytical assumptions. The proposed converter achieves a peak analytical efficiency of 94.46%, while the experimentally measured efficiency remains in the range of 93-95% under different load and power conditions.
Madhav Kumar, K. Panda, Ritula Thakur et al.· IEEE Access· 0 citations
