International Journal of Circuit Theory and Applications最新文献

{"title":"IGBT Junction Temperature Estimation Based on External Parameters of Multiple Drive Devices in Practical Industrial Scenario","authors":"Chenglang Su,&nbsp;Wei Jiang,&nbsp;Zhicong Huang","doi":"10.1002/cta.4391","DOIUrl":"https://doi.org/10.1002/cta.4391","url":null,"abstract":"<div>\u0000 \u0000 <p>The insulated gate bipolar transistor (IGBT) is one of the most important power semiconductor devices in power electronics and is also prone to failure. High junction temperature and junction temperature fluctuation of IGBT are the main causes of IGBT module aging failure. The high-precision monitoring of the junction temperature of the IGBT module is a prerequisite for IGBT life prediction, which is crucial for reducing maintenance costs and improving equipment reliability. Therefore, an IGBT junction temperature estimation method based on long short-term memory (LSTM) neural network and sliding window estimation model is proposed and applied in practical industrial scenarios. This method uses the operating data of the motor drive device in the actual industrial application scenario as the training and test data set and uses the external operating parameters of the IGBT module to estimate the junction temperature of the IGBT module. Compared with the internal operating parameters of the IGBT module based on switching transient, the external operating parameters are easier to collect and process, and more suitable for practical application scenes. A sliding window estimation model is proposed to estimate the junction temperature of the IGBT module. Compared with the point-to-point estimation method, the sliding window estimation method can capture the influence of historical operation data better and has a higher capability of time series data estimation. The IGBT junction temperature estimation of sliding windows is realized by the LSTM neural network, which is more suitable for time series estimation in real industrial scenarios. The experimental results show that the estimation accuracy of the sliding window estimation method is better than that of the point-to-point estimation method, and the accuracy of the sliding window estimation method based on LSTM is better than that of the sliding window estimation method based on other machine learning models. It proves that the proposed method can better capture the dynamic process of the system and has higher estimation accuracy.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 9","pages":"5379-5393"},"PeriodicalIF":1.6,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145012114","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 New High Voltage Gain Common-Ground Step-Up DC-DC Converter Integrating Coupled-Inductors and Switched-Capacitors","authors":"Arash Imanlou,&nbsp;Ebrahim Babaei,&nbsp;Seyed Hossein Hosseini","doi":"10.1002/cta.4342","DOIUrl":"https://doi.org/10.1002/cta.4342","url":null,"abstract":"<div>\u0000 \u0000 <p>This study proposes a new high-voltage gain quadratic-structured common-ground step-up DC-DC converter, integrating coupled-inductors and switched-capacitors. This configuration achieves a significant voltage gain without necessitating either a substantial duty cycle or an elevated turn ratio in the coupled-inductors. A critical innovation is the embedding of the secondary windings of the coupled-inductors into the switched-capacitor cell, which not only enhances voltage gain but also effectively suppresses the inrush current typical in such cells. The converter's features include the successful recycling of energy from the leakage inductors; low voltage stress exerted on power switches; zero-current switching (ZCS) turn-on of the main switch; ZCS conditions for the diodes' turn-off; reduced switching losses because of the application of a quasi-resonant (QR) operation between the leakage inductors and middle capacitors; simultaneous operation of the power switches; continuous input current; a wide duty cycle range; and a common-ground output–input connection. The operating principle, steady-state analysis (CCM and DCM), design considerations, efficiency calculation, small-signal modeling with controller design, and comparisons with other related converters are provided. Finally, experimental results from a 100- to 300-W prototype with 20- to 30-V input and 400-V output are given to validate the proposed converter's theoretical analysis and feasibility.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 9","pages":"5394-5409"},"PeriodicalIF":1.6,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011986","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":"Memristor-Based Reconfigurable True Time Delay Circuit","authors":"Fan Yang,&nbsp;Alexander Serb,&nbsp;Shiwei Wang,&nbsp;Christos Papavassiliou,&nbsp;Themistoklis Prodromakis","doi":"10.1002/cta.4387","DOIUrl":"https://doi.org/10.1002/cta.4387","url":null,"abstract":"<p>A memristor-controlled CMOS reconfigurable true time delay circuit is introduced in this paper. The delay circuit includes three stages of \u0000<span></span><math>\u0000 <msub>\u0000 <mrow>\u0000 <mi>g</mi>\u0000 </mrow>\u0000 <mrow>\u0000 <mi>m</mi>\u0000 </mrow>\u0000 </msub></math>-C all-pass filter delay elements connected in cascade and memristor-based tunable DC voltage sources. The memristor value variation changes the DC bias voltage inputs of the delay elements and thus controls the delay time indirectly: The memristor resistance changes in analogue from 10 to 17 k\u0000<span></span><math>\u0000 <mi>Ω</mi></math>, changing the tunable DC voltage source output from 584- to 711-mV DC voltage and the delay from 269 to 632 ps. The delay circuit can work in a frequency range from 50 MHz to 1.6 GHz with gain ripple smaller than 3 dB. The resolvable delay time step across the delay range is &lt; 8.7 ps, troughing at as low as 0.4 ps. A delay circuit working in the MHz region is also designed to compare the performance with the GHz circuit, and a memristor-programming circuit is built to change the resistance levels of memristors.</p>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 8","pages":"4935-4947"},"PeriodicalIF":1.6,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cta.4387","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling on High-Frequency Parasitic Parameters of Artificial Mains Network Based on Improved Differential Evolution Algorithm","authors":"Zhibo Zhu,&nbsp;Wei Yan,&nbsp;Yang Zhao","doi":"10.1002/cta.4377","DOIUrl":"https://doi.org/10.1002/cta.4377","url":null,"abstract":"<div>\u0000 \u0000 <p>The performance of the artificial mains network (AMN) has an important influence on the accuracy of the conducted electromagnetic interference (EMI) noise measurement. The high-frequency features of the AMN like impedance and voltage division factor (VDF) should be calibrated to enhance the precision of the conducted EMI noise measurement. Because the parasitic parameters of passive devices at high-frequency have a significant influence on the performance of the AMN, a high-frequency model of the AMN with parasitic parameters is established in the current study, and the high-frequency parasitic parameters are extracted based on an improved differential evolution (DE) algorithm and AMN topology. The live wire impedance and VDF of R&amp;S AMN ENV216 are obtained according to the presented approach. The results of the proposed method are compared with those extracted using the scattering parameters and a vector network analyzer, and the effectiveness of the method is validated. This study will aid in the calibration of the AMN and contribute to the accurate measurement of conducted EMI noise in electronic devices.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 8","pages":"4515-4525"},"PeriodicalIF":1.6,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767373","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 Novel Approach of Nonlinear Control in Photovoltaic/Wind/Energy Storage System With Event-Triggered DC Link Voltage Control in DC Microgrid","authors":"Alankrita,&nbsp;Avadh Pati,&nbsp;Nabanita Adhikary","doi":"10.1002/cta.4373","DOIUrl":"https://doi.org/10.1002/cta.4373","url":null,"abstract":"<div>\u0000 \u0000 <p>A hybrid DC microgrid (DC MG) integrates diverse renewable energy sources (RESs), each exhibiting unique nonlinear generation and power response characteristics. The intrinsic nonlinearity of these interacting RES necessitates the design of nonlinear control strategies to ensure stable operation and reliable power supply within the DC MG system. This paper presents a novel approach for nonlinear control of DC link voltage in hybrid DC MGs. Hybrid backstepping-based controllers with event-triggered (ET) control are proposed to enhance the energy quality produced by the DC MG during multiple disturbances while minimizing stress on converters by reducing the frequency of trigger signals. The PV controller is designed to maintain stability amid fluctuations in cell temperature and variations in solar irradiation. The wind controller is optimized for efficient wind power extraction, ensuring high performance in both static and dynamic conditions. The ESS is coordinated to mitigate constraints associated with RESs. Additionally, an ET controller is implemented for DC link voltage control, improving channel bandwidth efficiency and reducing strain on converters. This leads to longer interevent intervals compared with other nonlinear controllers, minimizing the need for frequent control adjustments. Lyapunov stability analysis is performed on the controllers to guarantee the asymptotic stability of the closed-loop system. The proposed control schemes are then validated through numerical simulations in MATLAB/Simulink and further tested on an OPAL-RT real-time simulator. The results demonstrate that the proposed scheme improves coordination challenges among multiple RESs under uncertainties while also lowering computational overhead compared with traditional control methods.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 9","pages":"5357-5378"},"PeriodicalIF":1.6,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145012482","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":"Single-Shot Auto-Exposure and High Dynamic Range Imaging Based on Asynchronous Operation of Pixel Array Circuitry","authors":"Yassine Lamouaraa-Sedlackova,&nbsp;Jorge Fernández-Berni,&nbsp;Ricardo Carmona-Galán","doi":"10.1002/cta.4381","DOIUrl":"https://doi.org/10.1002/cta.4381","url":null,"abstract":"<p>This paper introduces an image formation technique that realizes automatic adaptation to the illumination conditions <i>during</i> image capture. This adaptation takes place asynchronously in a single shot, requiring neither external control nor iterations on the exposure setting. These characteristics are especially suitable for applications such as visual robot navigation, where illumination may abruptly change and immediate decisions must be made. The equations that model the proposed technique show exposure-time independence. Moreover, each pixel adapts itself according to the ratio between local and global illuminations. The dependence on this ratio—which is a relative rather than absolute magnitude—along with the aforementioned independence on exposure time means that, <i>theoretically</i>, any illumination scenario can be represented within an arbitrary signal range. We also address the CMOS implementation of this technique. An extensive set of electrical simulations confirms its auto-exposure and high-dynamic-range encoding capabilities. In particular, we simulated the capture of a 118-dB scene on a \u0000<span></span><math>\u0000 <mn>160</mn>\u0000 <mo>×</mo>\u0000 <mn>120</mn></math>-px array over <i>five</i> orders of magnitude of ambient illumination. Corner and mismatch simulations reveal strong robustness of the proposed circuitry against fabrication non-idealities. Finally, although we aim to applications in which large image resolution is not a critical specification, strategies to minimize the impact of the required focal-plane circuit elements on the pixel pitch are examined.</p>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 8","pages":"4769-4782"},"PeriodicalIF":1.6,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cta.4381","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control of Instabilities in Resonant Converters Using Half-Period Time Delay Output Feedback","authors":"Kuntal Mandal,&nbsp;Mohamed Al-Numay,&nbsp;Zhen Li,&nbsp;Abdelali El Aroudi","doi":"10.1002/cta.4382","DOIUrl":"https://doi.org/10.1002/cta.4382","url":null,"abstract":"<div>\u0000 \u0000 <p>Bifurcation phenomena in power electronic converters lead to undesired instabilities. In this paper, different types of bifurcations are identified, which can occur in a series load resonant converter with the variation of the parameters for example, input voltage, load resistance, and so forth. These instabilities are associated mainly to three different bifurcations: (a) Neimark–Sacker, (b) saddle–node, and (c) symmetry breaking bifurcations. Due to the symmetry property of load resonant converters, a half-period time delay output feedback control is used to avoid all of these instabilities. The ideal time delay is realized by a first-order all-pass-filter. The stability analysis is performed and the values of the feedback gains are determined to identify the stable domain in the parameter space. By identifying the unstable orbits, the analytical stability analysis helps to understand as well as to control the mechanisms of these instabilities, which extends the stability domain of the system. This study can also be extended to other load resonant converters where the symmetry property naturally exists.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 8","pages":"4403-4418"},"PeriodicalIF":1.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767833","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 Differential LNA Employing Feedforward and Complementary Techniques for Integration of 5G Sub-6 GHz With Legacy Communication Standards","authors":"Navid Habibpour Moghaddam,&nbsp;Mohammad Hossein Maghami,&nbsp;Mohammad Bod,&nbsp;Fatemeh Mohammadi","doi":"10.1002/cta.4361","DOIUrl":"https://doi.org/10.1002/cta.4361","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper proposes a highly linear, wideband low noise amplifier (WBLNA) with differential structure in 0.13-μm CMOS Technology. The proposed WBLNA is designed for a 2- to 6-GHz band that covers multiple standards, such as Bluetooth, Wi-Fi, 3G, 4G, and 5G sub-6-GHz band. The presented circuit utilizes a well combination of recently published techniques, including inductive source degeneration, inductively series-peaking common source stage, cross-coupled topology, distributed structure, and noise cancelation methods. Moreover, the proposed amplifier utilizes feedforward and complementary techniques to attenuate both second- and third-order nonlinearity effects and improve the nonlinearity favorably. According to the post-layout simulation results, the proposed LNA achieves input return loss (<i>S</i>₁₁) lower than −10 dB, input third-order intercept point (IIP3) in between 13.42 and 13.48 dBm, flat noise figure (NF) of 3.4 ± 0.2, and flat power gain (<i>S</i>₂₁) of 12.93 ± 0.2 dB over 2- to 6-GHz frequency range. Furthermore, the proposed circuit meets the average input second-order intercept point (IIP2) of 64.5 dBm at 6 GHz and figure of merit (FOM) of 30.05 GHz while drawing 16.73 mA from the 1.2 V power supply.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 8","pages":"4783-4799"},"PeriodicalIF":1.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144768130","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 Family of Single-Switch High Step-Up DC-DC Converters Based on Switched-Capacitor Converters","authors":"Yu Fu,&nbsp;Shouxiang Li,&nbsp;Suli Zou,&nbsp;Xiaolu Lucia Li,&nbsp;Jingxi Yang,&nbsp;Guoju Zhang","doi":"10.1002/cta.4376","DOIUrl":"https://doi.org/10.1002/cta.4376","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a family of single-switch high step-up DC-DC converters based on switched-capacitor (SC) cells and coupled inductor (CL) or built-in transformer (BIT) is proposed. By replacing one active switch in the 3X-ladder switched-capacitor converter (SCC) with the primary side of a CL or BIT whose secondary side is incorporated into a multiplexed current path, the proposed topology integrates the high power-density feature of a ladder SCC with the voltage-lift effect of a CL or BIT. In addition, the problems of high current spikes and limited efficiency in the voltage regulation range of the traditional ladder SCC are tackled, making them suitable for distributed generation systems, microgrids, and so forth. For illustration purposes, the performance of the topologies within the family is compared in multiple ways, detailed operation principles and design considerations of one specific converter are given. Finally, experimental results are presented to verify the analytical findings.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 9","pages":"5338-5356"},"PeriodicalIF":1.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145013324","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":"An Adaptive Control Strategy for VSG Parameters With Perturbation Segmentation","authors":"Meijie Wang,&nbsp;Honglei Cen,&nbsp;Min Lu,&nbsp;Jingbin Li,&nbsp;M. Zhao,&nbsp;Jingyun Li","doi":"10.1002/cta.4384","DOIUrl":"https://doi.org/10.1002/cta.4384","url":null,"abstract":"<div>\u0000 \u0000 <p>The virtual synchronous generator (VSG)–based photovoltaic system is affected by the external environment and sudden changes in load, which can lead to deteriorations in dynamic characteristics of power and frequency and even system instability. To ensure the dynamic performance and stability of the system, it is necessary to adjust the inertia-damping parameters in time. This paper proposes a new cooperative adaptive control strategy for VSG inertia and damping parameters by analyzing the output angular frequency change and angular frequency deviation during the dynamic process of the system. Segmental adaptation is based on the size of the perturbation. The parameter selection rule is improved to increase the sensitivity of the parameter adjustment, and the improved sign function is used to prevent the parameter overmodulation problem. Finally, the proposed strategy is verified to effectively improve the system response speed and antidisturbance ability by comparing it with the traditional strategy on the MATLAB/Simulink simulation platform.</p>\u0000 </div>","PeriodicalId":13874,"journal":{"name":"International Journal of Circuit Theory and Applications","volume":"53 8","pages":"4560-4571"},"PeriodicalIF":1.6,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144768131","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}