Power Electronic Devices and Components’ Post

We encourage you to explore one of the July TCAS-I Paper Highlight videos "A High Sensitivity CMOS Rectifier for 5G mm-Wave Energy Harvesting". 📝 Authored by: Edoh Shaulov, Tal Elazar, Eran Socher Harvesting RF cellular power has vast potential to reduce battery reliance in low-power, wireless electronics. However, the challenge of efficiently converting the low-power RF signal to dc power remains a challenge, especially in the mm-Wave domain and, even more so, for CMOS. This work proposes a power-splitting and voltage-summation rectifier design technique that allows one to target a specific output voltage while optimizing power conversion efficiency (PCE). By splitting the input power to n rectifiers and series connecting them in dc, PCE saturation is mitigated and high output voltage can be achieved. This technique is thoroughly investigated in simulation and modelling, and validated by fabrication (TSMC 65 nm) and measurements where the proposed design achieves a record 400 mV output voltage and 15% PCE for -10 dBm input power at 28 GHz. Watch the video to learn more 👇 🔗 Read the paper on IEEE Xplore here: https://loom.ly/FhrLOjY #IEEECASS #TCASI #JulyHighlight

📽 This Tek Talk was recorded at PCIM this year, Chris Basso, an IEEE senior member, gives a short but deep insight into 'Analogue Current & Flux Balancing for the Dual-Active-Bridge Converter'. View our interviews from PCIM for an all round view of the latest Power Electronics available: #FutureElectronics #FluxBalancing #PowerElectronics

Publication: 𝗢𝘂𝘁𝗽𝘂𝘁 𝗰𝗵𝗮𝗿𝗮𝗰𝘁𝗲𝗿𝗶𝘀𝘁𝗶𝗰𝘀 𝗼𝗳 𝗽𝗮𝘀𝘀𝗶𝘃𝗲 𝗺𝗮𝗴𝗻𝗲𝘁𝗶𝗰 𝗲𝗻𝗲𝗿𝗴𝘆 𝗵𝗮𝗿𝘃𝗲𝘀𝘁𝗲𝗿 𝗳𝗲𝗲𝗱𝗶𝗻𝗴 𝗮 𝗰𝗼𝗻𝘀𝘁𝗮𝗻𝘁-𝘃𝗼𝗹𝘁𝗮𝗴𝗲-𝘁𝘆𝗽𝗲 𝗹𝗼𝗮𝗱 This paper provides a methodology for deriving a family of output characteristics (DC-side I-V and P-V curves) for a passive magnetic energy harvester (MEH) clamped on a sinusoidal current-carrying conductor. It is demonstrated that MEH characteristics depend on primary current magnitude and frequency as well on load voltage. First, expressions for power harvested by a MEH are derived employing nonlinear B-H curve approximation of the core. Then, conversion losses are assessed to provide respective estimates for the power provided by the MEH to the load. Presented analytical findings are accurately supported by experimental results of MEH designed to harvest up to 240W from a conductor carrying currents of up to 350A. 𝗔𝘂𝘁𝗵𝗼𝗿𝘀: Alexander Abramovitz, Moshe Shvartsas, Georgios Orfanoudakis, Alon Kuperman 𝗣𝘂𝗯𝗹𝗶𝘀𝗵𝗲𝗱 𝗶𝗻: IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. TBD, no. TBD, pp. TBD, 2024. 𝗥𝗲𝗮𝗱 𝗺𝗼𝗿𝗲: https://lnkd.in/dGwaZZhn

Modular Multilevel Converters (MMCs) require well-balanced submodule (SM) capacitor voltages at the reference value for satisfactory steady-state and dynamic operations. Achieving this goal in hybrid MMCs, where the modulation index exceeds one, becomes intricate owing to the differing participation of half-bridge submodules (HB-SMs) and full-bridge submodules (FB-SMs) in arm voltage generation. In our recent paper published in IEEE Transactions on Power Electronics, we present an advanced voltage-balancing method based on enhanced phase-shift modulation and model predictive control, featuring a single comprehensive cost function that utilizes a novel form of redundancy to manage the insertion of HB- and FB-SMs in a wide range of modulation indices. The designed cost function addresses four key control objectives: intercell balancing by tracking the DC voltage reference, minimizing the energy deviation between the HB- and FB-SMs, interleg balancing to eliminate energy variations between the upper and lower arms, and rejecting voltage errors arising from uncertainties in the SM capacitance using a Kalman filter-based observer. The proposed method enables comprehensive capacitor voltage balancing, suitable for various modulation indices and power factors. I am grateful for the opportunity to conduct research as part of my master's thesis work at the University of Tehran (UT). I would like to express my sincere appreciation to my colleagues, Saeid Ahmadi and Ehsan Asadi, for their collaboration and assistance throughout this journey. My supervisors, Dr. Yousef Neyshabouri, Prof. Hossein Imaneini, and Prof. Marco Liserre, provided me with invaluable guidance and expertise, for which I'm deeply grateful. #powerelectronics #modular_multilevel_converter #hybrid_mmc #mmc #over_modulation #balancing #mpc #pwm #kalmanfilter

Alhamdulillah, I am thrilled to share that my paper, "Performance Analysis of Thickness Dependency of Control Coefficients of CNTFET," has been published at the 2024 6th International Conference on Electrical Engineering and Information & Communication Technology (ICEEICT). This research dives into how varying thickness affects the control coefficients in CNTFET, potentially leading to significant advancements in their performance and application. For a detail read visit: https://lnkd.in/gdWmDZcU #ieee #ICEEICT2024 #CNTFET #research #innovation #engineering

It is my pleasure to share with you our recent publication entitled "Surge Current Analysis and Reduction in LLC Resonant Converter with a New Hybrid Control Strategy of Pulse Frequency Modulation and Phase Shift Modulation" in IEEE Transactions on Power Electronics, doi: 10.1109/TPEL.2024.3425377 https://lnkd.in/gvGUwR5f Fast charging of high-capacity battery packs contributes to more disruptions in AC-powered systems, thereby increasing the demand for intelligent converters that are both efficient and low in distortion. Therefore, it is crucial to have a battery charger that can respond to the battery's current condition and modify the charging procedure accordingly. To accommodate a wide battery voltage range in on-board battery charger (OBC) applications utilizing LLC resonant converters, a hybrid control technique that combines pulse frequency modulation (PFM) with phase shift modulation (PSM) has been proposed. It is assumed that the input voltage of the LLC converter experiences a 100 Hz fluctuation as a result of power factor correction (PFC) at the front-end power rectifier. When the control modes change between PSM and PFM due to input voltage fluctuations, a surge current is observed in the output current, which causes heat generation and battery deterioration. In addition to that, a change in the output gain of the main circuit has been confirmed. To mitigate this issue, a novel control state transition strategy known as overlapping (OVL) mode of operation is proposed for the LLC resonant converters employing PSM and PFM. The experimental findings validated the reduction in surge current and showed that the proposed control method is effective in comparison to the conventional hybrid method. #ieee #transactions #powerelectronics #OBC #PFM #PSM #PFC

𝐅𝐢𝐛𝐞𝐫-𝐎𝐩𝐭𝐢𝐜 𝐋𝐢𝐧𝐤𝐬 Montena's fiber-optic links are designed to transmit analog signals from DC up to 25 MHz (MOL25T) and 500 MHz (MOL500T), these compact modules are built to thrive in harsh electromagnetic environments like high-voltage substations, railway infrastructures, and physics research centers. They are ideal for capturing fast transients on high-voltage floating potentials and transmitting fast impulses or RF signals over long distances or in difficult-to-reach areas. Additionally, these systems are essential for HPEM, EMP, and UWB testing, ensuring accurate and interference-free data transmission in even the most challenging conditions. With optical fiber ensuring full galvanic isolation between the measurement point and the operator, you get reliable, interference-free performance every time. 𝑭𝒆𝒂𝒕𝒖𝒓𝒆𝒔 ✅All models of MOL (MOL25T, MOL500T, MOL2000T) are available in stand-alone and multilink versions ✅Built-in attenuators and preamplifiers can be remotely configured for optimized use of the input dynamic ✅The modules comprise automatic regulation of optical losses and thermal compensation for high-accuracy measurements ✅The optical signal and battery levels are monitored and status messages are reported to the user interface ✅Different models of the plug-in modules can be mixed into one chassis Contact us for a custom quote: https://lnkd.in/eBQzPgd9 #FiberOptics #EMC #ElectromagneticCompatibility #Technology #Innovation

Our latest paper has been accepted for publication in IEEE Transactions on Transportation Electrification: "Model Predictive Current Control of Nine-Switch Inverter-Fed Six-Phase Induction Motor Drives Under Healthy and Fault Scenarios", co-authored by Mohamed Gamal, Wessam Essam, Ayman Samy Abdel-Khalik, Mostafa Hamad, and Shehab Ahmed Elsayed. https://lnkd.in/dTi3sD3t Recently, finite-control-set model predictive control (FCS-MPC) has become ubiquitous in multiphase drives (MPDs), whose decomposed subspaces should be regulated through the control actions of a zero 𝒙𝒚-voltage projection to alleviate disruptive 𝒙𝒚 currents. Among multiphase traction inverters, the lower switch count of nine-switch inverters (NSIs) has made them a popular choice for six-phase induction motor (6PIM) drives. However, when the structure of the inverter changes, such as in the case of a NSI, it becomes necessary to redevelop finite control actions in order to attain the same objectives. Hence, this paper introduces a predictive current control (PCC) for NSI-fed 6PIM drives with a new control set selected to nullify 𝒙𝒚 voltage and maximize 𝜶𝜷 voltage as much as possible for six-phase winding configurations. Furthermore, the post-fault operation of NSI-fed 6PIM drives is also introduced under a complete open converter leg (OCL), where two phases, sharing the same faulty leg, are disconnected. The concept of phase transposition under OCL is found effective to achieve the same torque operating range of the conventional voltage source inverter (VSI)-fed 6PIM drive at the expense of additional hardware for winding reconfiguration. Experiments on 6PIMs with different winding arrangements showcase the significance of the proposal. IEEE Xplore: https://lnkd.in/dw9PUs7t #IEEE #multiphasemachines #electricdrives #powerelectronics #modelpredictivecontrol #faulttolerance

I am thrilled to share that our latest paper, "Analysis and Compensation of Dead Time Harmonics Based on Time Compensation Strategy in the Single-Phase Full-Bridge Inverters," co-authored with my esteemed doctoral advisor and Associate Professor Deniz Yıldırım, has been published in the Balkan Journal of Electrical and Computer Engineering (BAJECE). In this work, we delve into the critical issue of dead time—a brief period introduced in voltage-source inverters to prevent shoot-through in power switching devices. While necessary, dead time introduces several operational challenges for inverters, including distortion in output voltage and reduction in fundamental component magnitude due to harmonic components. Our paper not only analyzes the impact of dead time on unipolar sinusoidal pulse width modulation (SPWM) but also presents a detailed principle of our proposed compensation strategy. We further elaborate on implementing this strategy using the microprocessor-STM32F407G, supported by intensive simulations and experimental results on both resistive and resistive-inductive loads. You can access our work through the following link: https://lnkd.in/dzVW4C_g #ElectricalEngineering #PowerElectronics #InverterTechnology #ResearchPublication #TimeCompensationMethod #DeadTimeCompensationMethod #Unipolarswitching

🚀 New paper published in the journal #Telecom (IF: 2.1, Citescore: 4.8) 🖋️ Title: Measurement of Dielectric Properties of Thin Materials for #Radomes Using Waveguide Cavities 🔗 Paper can be viewed and downloaded via the link below: https://lnkd.in/erBzp4Gr #electromagnetics #wave #dielectrics