International Journal of Circuit Theory and Applications最新文献

{"title":"Soft-Switched High Voltage Gain Y-Quasi-Z Source DC-DC Converter for Renewable Energy Applications","authors":"Haibin Li,&nbsp;Jian Chen,&nbsp;Yin Chen,&nbsp;Minxin Lin,&nbsp;Tao Jin","doi":"10.1002/cta.70092","DOIUrl":"https://doi.org/10.1002/cta.70092","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a soft-switched high-voltage gain Y-quasi-Z source DC-DC converter, which integrates the advantages of quasi-Z source networks, Y source networks, and switched capacitor networks. The proposed converter achieves zero voltage switching (ZVS) for all active devices by replacing the diode in the quasi-Z source network with a switch. Besides, the proposed converter has the advantages of continuous input current, a common ground between input and output voltage, an active clamp loop that absorbs voltage spikes caused by the leakage inductor, diodes zero current switching (ZCS) that eliminates the reverse recovery loss, high voltage boost capability, and high efficiency. The operating modes and steady states are analyzed in detail. The efficiency calculation and power dissipation are studied. Then, comparisons between converters and component designations are presented. Finally, a 160-W prototype made in the laboratory verified that when the input voltage is 48 V, the output voltage can be enhanced to 380 V and the efficiency is 96.89%, while its corresponding hard-switched converter is 94.71%. The tested waveforms agree well with the theoretical analysis.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"1967-1978"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Model Prediction Current Control of Permanent Magnet Synchronous Linear Motor Based on Super-Twisting Sliding Mode Observer","authors":"Yuyi Pang,&nbsp;Haitao Yu,&nbsp;Jiahui Zhang","doi":"10.1002/cta.70096","DOIUrl":"https://doi.org/10.1002/cta.70096","url":null,"abstract":"<div>\u0000 \u0000 <p>The three-vector model predictive current control (MPCC) has advantages such as fast dynamic response and small current ripple, but it is easily affected by motor parameter perturbations. To improve the stability and robustness of permanent magnet synchronous linear motor (PMLSM) under parameter perturbations, this paper proposes a novel three vector MPCC based on super-twisting sliding mode observer (STSMO). Based on the mathematical model of PMLSM under parameter perturbation in synchronous rotating coordinate system, a new super local model is established. To avoid parameter perturbations and improve control accuracy, an STSMO is designed to online identify unknown disturbances and achieve feed-forward compensation. Both simulation and experimental comparisons are conducted between the proposed method and the traditional MPCC. The results show that the proposed method has strong robustness and improves the dynamic response performance of the PMLSM control system.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"2063-2073"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-Coil Structure Wireless Power Transfer System With Natural Constant Current and Constant Voltage Output Characteristics for Massive EBs Battery Charging","authors":"Shujia Xu,&nbsp;Le Yu,&nbsp;Lin Yang,&nbsp;Changsong Cai,&nbsp;You Lv,&nbsp;Guangyi Yang","doi":"10.1002/cta.70085","DOIUrl":"https://doi.org/10.1002/cta.70085","url":null,"abstract":"<div>\u0000 \u0000 <p>Wireless power transfer (WPT) is used in charging electric bicycles (EBs) due to its safety and convenience. However, existing WPT charging systems have problems such as unnecessary cross-coupling, redundant compensation components, additional AC switches, and complex parameter design. In order to solve the above problems, this paper proposes a WPT charging system based on a three-coil structure. Through the special parameter design of the three-coil structure, the system can achieve constant current (CC) output and constant voltage (CV) output under zero phase angle (ZPA) operation, avoiding the influence of unnecessary cross-coupling on the system output. In addition, by optimizing the LCC topology on the receiving side, the transition from CC to CV can be naturally achieved. It is worth emphasizing that the system only needs one inverter to charge a group of EBs at the same time, which reduces the system cost. Firstly, the proposed WPT charging system is theoretically analyzed in detail. Secondly, the WPT system is verified to have load-independent CC and CV output characteristics and ZPA operation through simulation. Finally, an experimental prototype is built. Both charger 1 and charger 2 achieved 3 A CC output and 80 V CV output. The experimental results verified the correctness of the theoretical analysis.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"1979-1989"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Semisupervised Learning Diagnosis Method for Series Arc Faults in PV Arrays Under Shading Conditions","authors":"Yuchen Wang,&nbsp;Zhongyan Li,&nbsp;Han Su","doi":"10.1002/cta.70077","DOIUrl":"https://doi.org/10.1002/cta.70077","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper proposes an intelligent wavelet decomposition and reconstruction-frequency enhanced decomposition transformer-semisupervised learning (WDR-FEDformer-SSL) method for detecting series arc faults in photovoltaic (PV) arrays under shading conditions, using limited labeled on-site data. Fault arc patterns are classified by analyzing the interaction of I-V curves between the PV array under shading conditions and the fault arc. Transformer neural networks are first introduced and designed to detect and identify DC fault arcs by using the FEDformer network with the multihead attention mechanism to deeply explore the fault features. Additionally, wavelet packet decomposition combined with dynamic soft thresholding denoising algorithms is employed to effectively suppress environmental noise interference and to obtain time-scale signals for the transformer neural network. Aiming at the lack of labeled data on-site and to enhance training accuracy, semisupervised learning (SSL) methods are proposed by leveraging a large amount of unlabeled sample data from on-site with a pseudo-label confidence propagation mechanism, and the model of the PV system with fault arc and shading condition is used to increase the labeled samples under shading conditions. Experimental results show that the proposed method achieved an average recognition accuracy of 98.6% under shading conditions.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"2024-2036"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A High-Speed Simultaneous Wireless Power and Multibit Data Transfer System","authors":"Chenyang Xia,&nbsp;Xirui Wang,&nbsp;Ziyue Yang,&nbsp;Anran Sun,&nbsp;Ganquan Cui,&nbsp;Xinheng Li,&nbsp;Tao Lu,&nbsp;Kanghua Hu","doi":"10.1002/cta.70104","DOIUrl":"https://doi.org/10.1002/cta.70104","url":null,"abstract":"<div>\u0000 \u0000 <p>Existing single-channel simultaneous wireless power and data transfer (SWPDT) systems are fundamentally constrained by their single-bit transfer architecture, which seriously restricts the achievable data rate. To address these limitations, this paper proposes a simultaneous wireless power and high-speed multibit data transfer (SWPHMDT) system. To achieve high-speed data transmission, a multichannel parallel data transmission architecture is proposed, with a secondary-side demodulation method based on transient response. By utilizing a multifrequency blocking network, the system effectively isolates data channels from the power channel, ensuring reliable power transfer. The system architecture and operational principles of the SWPHMDT system are described in detail. A dual-channel SWPHMDT configuration is developed based on a four-resonance dual-reflective (FRDR) structure, with analytically derived operating conditions. The crosstalk mechanisms between channels are investigated, and the parametric dependencies of system performance are examined. Furthermore, the optimal regulation resistance for high-speed data transmission is derived based on the transient response characteristics of the data channels. Experimental validation is carried out using a 356.07-W prototype, demonstrating a 2-Mbps data rate, 86.483% power transfer efficiency, and a data transfer delay of 1.8 μs.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"1901-1915"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Voltage Stress Shared Bidirectional DC-DC Converter With High Voltage Conversion Ratio and Wide Zero-Voltage Switching Range","authors":"Zhengang Sun,&nbsp;Changhuan Shi,&nbsp;Yongjia Hu,&nbsp;Peikang Zhou,&nbsp;Jiacheng Guo,&nbsp;Huang Yi,&nbsp;Renjun Hu,&nbsp;Xiuli Yang","doi":"10.1002/cta.70078","DOIUrl":"https://doi.org/10.1002/cta.70078","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, we propose a voltage stress shared bidirectional DC-DC converter designed for energy storage systems. Compared with traditional bidirectional DC-DC converters, it features a high voltage conversion ratio, low voltage stress, low current ripple, and a wide soft-switching range. The bidirectional DC-DC converter achieves a high voltage conversion ratio and low voltage stress by splitting the low-voltage side capacitors in series and incorporating a hybrid clamp structure on the high-voltage side. Meanwhile, thanks to the split-capacitor structure and reasonable switch configuration, all switching devices except <i>S</i>₂ experience a maximum voltage stress of only 100 V, significantly lower than other similar converters, reducing device costs and improving reliability. Additionally, the low-voltage side employs a multiphase interleaved technique, significantly reducing the current ripple. All switches in the bidirectional DC-DC converter can achieve zero-voltage switching across the entire range by setting appropriate parameters. Meanwhile, this paper provides a detailed explanation of the working principles and steady-state analysis of the bidirectional DC-DC converter. By comparing the proposed converter in this paper with some of the advanced converters in recent years across various dimensions, it has been demonstrated that the performance advantages of this converter are evident. A 1000 W-rated experimental prototype is presented, which can achieve a high efficiency at rated power. For different power applications, the converter can be designed according to the actual power requirements to obtain the optimal efficiency. The experimental results demonstrate the bidirectional DC-DC converter's significant advantages, such as high voltage gain and low voltage stress, effectively verifying the feasibility of this topology.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"2116-2134"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large-Signal Stability Analysis of Grid-Following Converters Considering the Behavior of Grid-Forming Converters","authors":"Meng Huang,&nbsp;Sirui Shu,&nbsp;Xilin Li,&nbsp;Xiaoming Zha,&nbsp;Zhen Tian","doi":"10.1002/cta.70089","DOIUrl":"https://doi.org/10.1002/cta.70089","url":null,"abstract":"<div>\u0000 \u0000 <p>The increasing penetration of renewable energy challenges single-converter systems to simultaneously provide transient support and rapid response. Hybrid microgrids integrating grid-forming (GFM) and grid-following (GFL) converters are thus essential for dual-high power systems. Existing studies primarily focus on single-converter stability, neglecting the dynamic interactions between converters operating under different control paradigms. In this study, a scaling-based equal-area criterion (EAC) method is first applied to analyze the worst-case stability impacts of interaction terms. The first integration method then reveals that the additional GFM-VSC alters the potential energy and damping distribution of the GFL-VSC while introducing path-related terms. A novel concept, the dynamic parameter-dependent domain of attractions (PDAs), is employed to analyze the transient behavior of the GFL-VSC. The expansion of the PDA indicates that the additional GFM-VSC enhances the transient stability of the GFL-VSC by modifying its potential energy and damping distribution. However, the energy released or absorbed by path-related terms affects the effectiveness of the GFM-VSC in improving transient stability, which can be mitigated by increasing the inertia coefficient of the GFM-VSC. Simulation and experimental results are presented to validate the proposed approach and verify the conclusions.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"2135-2145"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Torque Ripple Reduction in MPDTC of SRM Drives Using Optimized Switching States and Advanced Torque Sharing Function","authors":"K. Dhineshkumar,&nbsp;G. Prakash,&nbsp;K. Eswaramoorthy,&nbsp;G. Ramya","doi":"10.1002/cta.70109","DOIUrl":"https://doi.org/10.1002/cta.70109","url":null,"abstract":"<div>\u0000 \u0000 <p>The combination of model predictive control and direct torque control approached for switched reluctance motor, multiple switch state combinations should be traversed, which may lead to complex calculations. To solve this problem, a torque compensation-based enhanced model predictive direct torque control for switched reluctance motor (SRM) with switching states restructuration is proposed. However, effective torque and flux control remain challenging due to highly nonlinear magnetic characteristics and significant torque ripple. The first strategy employs an eight-sector switching state allocation method for precise position-based control. The second strategy implements a torque compensation algorithm integrated with a torque sharing function, which selects the phase exhibiting superior torque tracking for compensation. The proposed model is implemented and validated through MATLAB-based simulations. The performance of the proposed model is compared with existing model predictive direct torque control methods, with a primary focus on minimizing torque ripple. Experimental results show that the proposed strategy can effectively reduce the torque ripple by 38.7%. The proposed control techniques, which analyze variable speed and dynamic operation, are primarily intended for traction motor drive applications. The real-time hardware controller implements the proposed techniques to enable analysis of additional performance parameters.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"1990-2000"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bidirectional Resonant Converter With Interleaved Three CLLC Energy Transmission Rails for EV Charger","authors":"Qiuxia Yang,&nbsp;Tianrui Wang,&nbsp;Jing Yuan,&nbsp;Qinglin Zhao","doi":"10.1002/cta.70087","DOIUrl":"https://doi.org/10.1002/cta.70087","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper proposes a bidirectional resonant converter with three <i>CLLC</i> resonant tanks for energy transmission in electric vehicle (EV) charger applications. The converter inherits the advantages of higher power density and lower current ripple from conventional three-phase interleaved structure. By analyzing the phase-disabling modes of the conventional three-phase <i>CLLC</i>converter and reconstructing the circuit, two improved operational modes are introduced to enhance converter performance: (1) a single-phase half-bridge mode to expand the voltage gain range and (2) a two-phase full-bridge mode to improve light-load efficiency. Smooth transitions between adjacent operating modes can be achieved. A 3.3-kW prototype was built to verify the converter's applicability, with the bus voltage fixed at 400 V during operation. In forward operation, the output voltage range was 140–500 V, achieving a maximum efficiency of 98%. In reverse operation, the input voltage range was 300–500 V, with a maximum efficiency of 98.1%.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"2090-2102"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Three-Stage Integrated Sliding Mode Observer-Based Position Estimation Scheme for PMSM","authors":"Jun Cai,&nbsp;Yuhan Gu,&nbsp;Ying Yan,&nbsp;Adrian David Cheok,&nbsp;Xin Zhang","doi":"10.1002/cta.70105","DOIUrl":"https://doi.org/10.1002/cta.70105","url":null,"abstract":"<div>\u0000 \u0000 <p>To further improve the position estimation performance of permanent magnet synchronous motor (PMSM) and reduce the high-frequency chattering of the sliding mode observer (SMO)-based position estimation strategy, this paper proposes a three-stage integrated SMO-based sensorless position estimation algorithm that integrates an adaptive filter and an orthogonal phase-locked loop. By selecting the hyperbolic tangent function with optimal parameters as the switching function of the sliding mode observer, the harmonic contents in the observed back electromotive force (Bemf) can be reduced and the use of a low-pass filter can be avoided. To filter out the high-frequency interference in the Bemf, the synchronous adaptive filter is also adopted. Finally, an improved orthogonal PLL with forward and reverse functions is adopted to estimate the rotor position, further improving the accuracy of position estimation. To verify the effectiveness of the proposed method, detailed experiments are implemented in a rated 60 W PMSM motor drive system.</p>\u0000 <p><b>Trial Registration:</b> No clinical trial.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"54 4","pages":"2103-2115"},"PeriodicalIF":1.6,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147708296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}