Wissem KHARZI’s Post

This work was presented at IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, Portugal. Phase Locked Loop with DC-Offset Removal for Grid Synchronization Abstract: This paper proposes an efficient and simple solution for grid synchronization adopting a phase angle correction in the conventional synchronous reference frame (SRF) phase locked loop (PLL) with its small single model and stability analysis. The proposed method is computationally simple and capable of DC-offset rejection and perfectly synchronizing with the grid. The proposed method is compared with another powerful PLL method showing promising results. DOI: https://lnkd.in/dAq-f8em

At ECCE Europe in Darmstadt, Simon Beck presented his new paper on bidirectional wireless power transfer (WPT) converters. It introduces an analytical modelling approach for series-resonant converters operated with two active bridges. Based on this approach, an analytical comparison of the efficiencies of DAB, LLC-DAB and CLLC-DAB converters yields valuable insights into the optimal converter selection considering the coupling of the WPT transformer. The paper can be found here: https://lnkd.in/dSAZbBnu

Ever since Nicolas Roch told me about this upcoming paper a few months ago, I've been eagerly waiting for its release. And it's finally out! The research on superconducting traveling-wave parametric amplifiers (TWPAs) just hit a new milestone. The team has successfully created a Josephson-junction-based TWPA isolator, which achieves an impressive 20 dB gain and 30 dB reverse isolation over 500 MHz. This advancement means we can now design more efficient and compact quantum readout systems that fit perfectly within a dilution refrigerator, removing the need for bulky isolators. By integrating both amplification and isolation directly into the system, this technology could make complex quantum circuits easier to design and operate. This could open the door to new functionalities and significantly boost overall performance. 📷 Check out the full paper here: https://lnkd.in/duNVaA6Y

Pleased to share my recent article entitled “Anand constitutive modeling of multilayer Silver-Tin transient liquid phase foils using tensile and creep testing” published in SSMT. This paper introduces, for the first time in literature, Anand constitutive models of Silver-Tin Transient Liquid Phase bonds of power electronics. This work is conducted during my last visit at the IMTEK, University of Freiburg which financed by DAAD German Academic Exchange Service. Please read, share and cite! https://lnkd.in/eAzMWpn6 

 //I hosted a webinar on May 17, 2024 on// "𝐇𝐨𝐰 𝐭𝐨 𝐚𝐧𝐚𝐥𝐲𝐳𝐞 𝐞𝐥𝐞𝐜𝐭𝐫𝐢𝐜𝐚𝐥 𝐢𝐦𝐩𝐞𝐝𝐚𝐧𝐜𝐞 𝐩𝐫𝐨𝐩𝐞𝐫𝐭𝐢𝐞𝐬 𝐨𝐟 𝐩𝐢𝐞𝐳𝐨𝐞𝐥𝐞𝐜𝐭𝐫𝐢𝐜 𝐬𝐞𝐧𝐬𝐨𝐫𝐬" You can watch the recording here: https://lnkd.in/e-sbZ8wf //Summary// In this webinar, I (1) review piezo sensor equations, (2) describe how to analyze piezo voltage when external circuits are applied and (3) describe voltage and charge amplifier circuits used to stabilize and amplify the sensor output. //Sponsor information// This webinar was sponsored by PI Ceramic Technology. Learn more about their piezo ceramic products at this link: https://lnkd.in/dAcQr4t2

I am delighted to share with you my last paper that is published in the Journal of IET Science, Measurement, and Technology with an impact factor of 1.6 Alireza Karimonnafs Title: Synchronous switching of uncompensated transmission line, by considering the effect of coupling voltage between the phases, trapped charge, and the characteristics of CB: ORIGINAL RESEARCH IET Science, Measurement, and Technology DOI: 10.1049/smt2.12164

💡Article spotlight: A D-Band Frequency-Doubling Traveling-Wave Amplifier Through Monolithic Integration of a SiC SIW and GaN HEMTs This paper presents a unique doubling all-solid state traveling wave amplifier operating from 132-140 GHz with more than 250 mW of output power. They utilize GaN HEMT amplifiers power combined in a SiC substrate integrated waveguide to achieve their impressive performance.  This paper is part of our January 2024 issue. 📎 Read the full article here: https://lnkd.in/gpjtSYK8  🌐 Topics covered in this article: Frequency multipliers, millimeter wave, MMICs, power combiners, substrate integrated waveguides, traveling wave amplifiers 📝 Authors: Lei L., Patrick Fay, James Hwang

💡Article spotlight: Realization of Electrically-Switched Dynamic Focused Beam Charging System With a Reconfigurable Phase-Change Cascaded Feed Network for Wireless Power Transfer In this paper, the authors describe a low-cost power beaming system at 5.8 GHz that has a reconfigurable beam direction. The circuit uses a switchable 2D Rotman lens feeding a large 2D patch array (for creating the focused beam), rather than more expensive phase shifters, to steer the beam. The system is demonstrated on a distributed LED panel with selectable power-on regions triggered by electronically steering the RF beam from place to place on the panel. Focusing onto the panel takes place in the near field of the lens-plus-array beam former and transmitter, and significant power transfer occurs. This paper is part of our July 2024 issue. 📎 Read the full article here: https://lnkd.in/g3e36DUS  🌐 Topics covered in this article: Active focusing system, beam forming, dynamic charging, reconfigurable feed network, wireless power transfer 📝 Authors: Wenyi Shao, Bo Yang, Shinichiro Horiuchi, Naoki Shinohara, Minoru Furukawa

How to implement non-contact wireless power transfer? This paper analyzes a possible solution. Excited to share that our paper entitled "Analysis and experimental validation of the WPT efficiency of the both-sides retrodirective system" is published in Elsevier through KeAi Publishing. You can download the paper here: https://lnkd.in/gHpiXi39 This paper discusses how we modeled the both-sides retrodirective system and showed that it can naturally achieve maximum WPT efficiency available to the channel at steady state. We also discuss here the experiment design we used to validate the theoretical analysis. Although we validated it through a wired channel, we can simulate different wireless channel conditions using the board we designed. Theoretical prediction and experiment results match within 10% of each other. Further improvements can be made to the experiment and reduce the error. Thank you very much to Prof. Shinichi Nakasuka, Prof. Naoki Shinohara, and Prof. Bo Yang for their guidance on the completion of this experiment. Excited to take this concept further, hopefully into the market.

Minimizing switching losses continues to be a major challenge for power device engineers working on SiC and GaN devices. The standard test method for measuring switching parameters and evaluating the dynamic behavior of Si, SiC, and GaN MOSFETs and IGBTs is the double pulse Test (DPT). In this TIF on-demand webinar, you will: • Learn techniques for proper testing of Silicon Carbide (SiC) devices. • Review considerations for creating a double double pulse test setup. • Overview of basic equipment, setups, connections and probes. • Look at the technical considerations for the probing strategy. Unlock valuable insights on wide bandgap double pulse testing from industry expert, Masashi Nogawa (Systems Engineer, Qorvo). Sign up to watch on demand now! https://lnkd.in/g2hrPs32