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IEEE Annual Southern Power electronics Conference (SPEC)

作者： João Henrique De Oliveira Jamie E. Turnbull Giri Venkataramanan Daniel Ludois Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil Wisconsin Electric Machines and Power Electronics Consortium (WEMPEC) University of Wisconsin - Madison Madison WI USA

The quest for component size reduction raises concerns regarding device temperatures, particularly in power semi-conductor devices. In the pursuit of improved heat dissipation, several strategies can be used to optimize the heat transfer. This paper investigates the use of an oil immersed converter to enhance temperature performance in power converters. Prototypes were developed and tested in both air and Cargill FR3 oil. The case temperature of the IGBTs was monitored under various test scenarios involving power flow and switching frequency variations. The results consistently demonstrated lower IGBT temperatures in the oil-immersed converter across all test scenarios. In steady state, the temperature difference reached a significant 52% reduction compared to the ambient-air converter at the same operating point. These findings highlight the effectiveness of oil immersion in improving thermal performance in power converters. Hi-Pot tests demonstrate that when submerged in oil, high voltage levels can be applied to the board without experiencing voltage breakdown accompanied by sparks.

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Enhancing emission performance of red TADF emitters via the introduction of electronically inert pendant

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Organic electronics 2024年 126卷

作者： Tang, Yukun He, Jian-Li Zhang, Kai Zhao, Yue Lin, Yu-Ching Chen, Chia-Hsun Chiu, Tien-Lung Lee, Jiun-Haw Wang, Chuan-Kui Fan, Jian Wu, Chung-Chih Department of Electrical Engineering Graduate Institute of Electronics Engineering and Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei 10617 Taiwan Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Jiangsu Suzhou215123 China Shandong Province Key Laboratory of Medical Physics and Image Processing Technology School of Physics and Electronics Shandong Normal University Jinan250014 China Coordination Chemistry Institute State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing National Laboratory of Microstructures Nanjing University Nanjing210023 China Department of Chemistry National Taiwan University Taipei10617 Taiwan Department of Electrical Engineering Yuan Ze University Taoyuan32003 Taiwan Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering National Taiwan University Taipei10617 Taiwan State Key Laboratory of Structural Chemistry Fujian Institute of Research on Structure of Matter Chinese Academy of Sciences Fujian Fuzhou35002 China

In addition to emission efficiency and colors, emission characteristics such as preferentially horizontal emitting dipole orientation and resistance against concentration quenching are also highly desired for high-performance thermally activated delayed fluorescence (TADF) emitters. In this work, we report a simple and yet effective strategy for enhancing such emission performance of the pure red-to-near infrared (NIR) TADF emitter by introducing bulky aryl derivatives (m-xylene) to the efficient emission core. Incorporating m-xylene groups as the electronically inert pendants to the acceptor unit of the TADF emitter TPA–CN–N4-CH3 successfully retains favorable emission properties (e.g., pure red color chromaticity, nearly unitary photoluminescence quantum yield etc.) of the parent compound TPA–CN–N4 and yet also renders significantly higher horizontal emitting dipole ratio Θ// of ∼85 % with the more extended molecular configuration and reduced concentration quenching at very high concentrations in thin films. As a result, OLEDs adopting TPA–CN–N4-CH3 can demonstrate rather high EQEs of 29.8–32.1 % for pure red emission (625–650 nm) at low doping concentrations and decent EQEs of 18.9–27.5 % in the deep red to NIR range (650–700 nm) at higher doping concentrations. The results of this work shall provide a useful reference for development of efficient TADF emitters. © 2024 Elsevier B.V.

关键词： Fluorescence

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Input Impedance and Performance Analysis of Series-Fed Microstrip Patch Array Antenna

Input Impedance and Performance Analysis of Series-Fed Micro...

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2022 International Conference on Power, Energy and Innovations, ICPEI 2022

作者： Phakaew, Thipamas Pongthavornkamol, Tiwat Thaiwirot, Wanwisa Chalermwisutkul, Suramate The Sirindhorn International Thai-German Graduate School of Engineering King Mongkut's U. of Technology North Bangkok Bangkok Thailand National Electronics and Computer Technology Center National Science and Technology Development Agency Pathum Thani Thailand King Mongkut's U. of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering Bangkok Thailand

ISBN: (数字)9781665460194

ISBN: (纸本)9781665460194

This paper presents input impedance and performance analysis of a series-fed 2×1 patch array antenna operating at 9.55 GHz. Effects of substrate's dielectric constant and height are discussed. Input impedance is optimized step by step from a single patch to a 2×1 array. Low impedance patches provide higher gain at the cost of increased capacitive coupling between the elements. Consequently, input impedance at the operating frequency is affected by the higher resonant mode. Finally, a technique to mitigate the coupling between the patches is proposed. With the proposed technique, the higher resonant mode can be eliminated so that the 2×1 array can easily be matched and operates with the correct patch array mode. © 2022 IEEE.

关键词： Microstrip antennas

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A Fiber Bragg Grating based Accelerometer for Monitoring the Vibration of an Industrial Engine Prototype: A Preliminary Study 5

A Fiber Bragg Grating based Accelerometer for Monitoring the...

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5th International Conference on Applications of Optics and Photonics, AOP 2022

作者： Silveira, Mariana Avellar, Leticia Cruzeiro, Filipe Macedo, Leandro Leal-Junior, Arnaldo Garcia, Guilherme Frizera, Anselmo Díaz, Camilo Telecommunications Laboratory LABTEL Electrical Engineering Department Federal University of Espírito Santo Espírito Santo29075-910 Brazil Graduate Program in Mechanical Engineering Federal University of Espírito Santo Fernando Ferrari Avenue-ES Vitória29075-910 Brazil ArcelorMittal Global R&D Brazil

Monitoring the vibration of industrial engines is essential for running diagnostics that can detect faults and point out the feasibility of predictive maintenance. Therefore, this paper describes an optical accelerometer based on a fiber Bragg grating to monitor the vibration of the gearbox of an industrial engine prototype. Experimental tests were performed varying the motor's rotation speed during normal operation. To validate the proposed system, two electronic accelerometers were attached to the motor's gearbox and bearing. The natural frequency response of the optical accelerometer was simulated and good agreement with the experimental results was obtained (0.83% of error). The proposed sensor was able to correctly identify the operation speeds of 20, 25, 35, 40, 45 and 50 rps with a maximum error of 0.05%. The mean signal-to-noise ratio (SNR) of the optical accelerometer was 64.05% higher than the SNR of one of the electronic solutions. The experimental results show that the vibration signals have different characteristics when measured at the bearings and at the gearbox, indicating the feasibility of multi-signals analysis for fault detection. © Published under licence by IOP Publishing Ltd.

关键词： Accelerometers

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Wideband and Channel Switchable Mode Division Multiplexing (MDM) Optical Power Divider Supporting 7.682 Tbit/s for On-Chip Optical Interconnects

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Sensors 2023年第2期23卷 711-711页

作者： Hung, Tun-Yao Chen, Guan-Hong Lin, Yuan-Zeng Chow, Chi-Wai Jian, Yin-He Kuo, Pin-Cheng Peng, Ching-Wei Tsai, Jui-Feng Liu, Yang Yeh, Chien-Hung Department of Photonics & Graduate Institute of Electro-Optical Engineering College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Photonics & Graduate Institute of Electro-Optical Engineering College of Electrical and Computer Engineering National Chiao Tung University Hsinchu30010 Taiwan Philips Electronics Ltd. N.T Hong Kong Department of Photonics Feng Chia University Taichung40724 Taiwan

Silicon photonics (SiPh) are considered a promising technology for increasing interconnect speed and capacity while decreasing power consumption. Mode division multiplexing (MDM) enables signals to be transmitted in different orthogonal modes in a single waveguide core. Wideband MDM components simultaneously supporting wavelength division multiplexing (WDM) and orthogonal frequency-division multiplexing (OFDM) can significantly increase the transmission capacity for optical interconnects. In this work, we propose, fabricate and demonstrate a wideband and channel switchable MDM optical power divider on an SOI platform, supporting single, dual and triple modes. The switchable MDM power divider consists of two parts. The first part is a cascaded Mach–Zehnder interferometer (MZI) for switching the data from their original TE0, TE1 and TE2 modes to different modes among themselves. After the target modes are identified, mode up-conversion and Y-branch are utilized in the second part for the MDM power division. Here, 48 WDM wavelength channels carrying OFDM data are successfully switched and power divided. An aggregated capacity of 7.682 Tbit/s is achieved, satisfying the pre-forward error correction (pre-FEC) threshold (bit-error-rate, BER = 3.8 × 10−3). Although up to three MDM modes are presented in the proof-of-concept demonstration here, the proposed scheme can be scaled to higher order modes operation. © 2023 by the authors.

关键词： Silicon photonics

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Design Consideration, Numerical and Experimental Analyses of Mode-Division-Multiplexed (MDM) Silicon Photonics Integrated Circuit with Sharp Bends

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Sensors 2023年第6期23卷 2965页

作者： Kuo, Pin-Cheng Chow, Chi-Wai Lin, Yuan-Zeng Gunawan, Wahyu Hendra Hung, Tun-Yao Jian, Yin-He Chen, Guan-Hong Peng, Ching-Wei Liu, Yang Yeh, Chien-Hung Department of Photonics & Graduate Institute of Electro-Optical Engineering College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Photonics & Graduate Institute of Electro-Optical Engineering College of Electrical and Computer Engineering National Chiao Tung University Hsinchu30010 Taiwan Philips Electronics Ltd N.T Hong Kong Department of Photonics Feng Chia University Taichung40724 Taiwan

Due to the popularity of different high bandwidth applications, it is becoming increasingly difficult to satisfy the huge data capacity requirements, since the traditional electrical interconnects suffer significantly from limited bandwidth and huge power consumption. Silicon photonics (SiPh) is one of the important technologies for increasing interconnect capacity and decreasing power consumption. Mode-division multiplexing (MDM) allows signals to be transmitted simultaneously, at different modes, in a single waveguide. Wavelength-division multiplexing (WDM), non-orthogonal multiple access (NOMA) and orthogonal-frequency-division multiplexing (OFDM) can also be utilized to further increase the optical interconnect capacity. In SiPh integrated circuits, waveguide bends are usually inevitable. However, for an MDM system with a multimode bus waveguide, the modal fields will become asymmetric when the waveguide bend is sharp. This will introduce inter-mode coupling and inter-mode crosstalk. One simple approach to achieve sharp bends in multimode bus waveguide is to use a Euler curve. Although it has been reported in the literature that sharp bends based on a Euler curve allow high performance and low inter-mode crosstalk multimode transmissions, we discover, by simulation and experiment, that the transmission performance between two Euler bends is length dependent, particularly when the bends are sharp. We investigate the length dependency of the straight multimode bus waveguide between two Euler bends. High transmission performance can be achieved by a proper design of the waveguide length, width, and bend radius. By using the optimized MDM bus waveguide length with sharp Euler bends, proof-of-concept NOMA-OFDM experimental transmissions, supporting two MDM modes and two NOMA users, are performed. © 2023 by the authors.

关键词： Orthogonal frequency division multiplexing

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Comparison of Perovskite Deposition Method on Carbon-based Perovskite Solar Cell

Comparison of Perovskite Deposition Method on Carbon-based P...

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Power and Energy Systems engineering (CPESE), International Conference on

作者： Junivan Sulistianto Akinori Konno Nji Raden Poespawati Tomy Abuzairi Graduate School of Science and Technology Shizuoka University Hamamatsu Japan Department of Electrical Engineering Universitas Indonesia Depok Indonesia Department of Electronics and Material Science Shizuoka University Hamamatsu Japan

The increasing energy demand and the urge to tackle the climate crisis have assembled a global movement to shift from using fossil fuels for energy generation to clean energy sources. Perovskite solar cells are a promising candidate to fulfill future electricity demand because they can generate high efficiency while maintaining a low production cost. Although several deposition techniques may be employed to create perovskite film, solution-based deposition is the most common and extensively utilized in the fabrication of perovskite solar cells. Solution-based deposition methods can produce high-quality perovskite films using relatively simple and low-energy equipment. Furthermore, it is possible to tailor the precursor solution and deposition method to enhance the film quality. Solution-based deposition methods include the one-step and two-step methods. Each method has its advantages and disadvantages. On the other hand, the use of carbon as a counter electrode can increase the stability of the perovskite solar cell due to its hydrophobic properties. Perovskite material is well-known for its susceptibility to water, even moisture. This research investigates the use of one-step and two-step deposition methods on carbon-based perovskite solar cells. Different morphology produced from each deposition method has different effects on the interface between perovskite and carbon. The results demonstrate that, with an open-circuit voltage of 0.85 V, a short-circuit current density of 5.48 mA/cm 2 , and a fill factor of 0.32, the two-step technique yields a greater efficiency of 1.51%.

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Wireless,multimodal sensors for continuous measurement of pressure,temperature,and hydration of patients in wheelchair

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npj Flexible electronics 2023年第1期7卷 479-493页

作者： Seokjoo Cho Hyeonseok Han Hyunwoo Park Sung-Uk Lee Jae-Hwan Kim Sung Woo Jeon Mengqiu Wang Raudel Avila Zhaoqian Xi Kabseok Ko Minsu Park Jungyup Lee Myungwoo Choi Je-Sang Lee Weon Gi Min Byeong-Ju Lee Soyeong Lee Jungrak Choi Jimin Gu Jaeho Park Min Seong Kim Junseong Ahn Osman Gul Chankyu Han Gihun Lee Seunghwan Kim Kyuyoung Kim Jeonghyun Kim Chang-Mo Kang Jahyun Koo Sung Soo Kwak Sungbong Kim Dong Yun Choi Seokwoo Jeon Hyung Jin Sung Yong Bae Park Minkyu Je Young Tae Cho Yong Suk Oh Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Advanced 3D Printing Technology Development Division Korea Atomic Energy Research InstituteDaejeon 34057Republic of Korea Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116023P.R.China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Ningbo Institute of Dalian University of Technology Ningbo 315016China Department of Electronics Engineering Kangwon National UniversityChuncheon 24341Republic of Korea Querrey-Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Sibel Health Inc NilesIL 60714USA Department of Materials Science and Engineering KAIST Institute for The Nanocentury(KINC)Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Rehabilitation Medicine Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of planning and development Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of rehabilitation medicine Pusan national university hospitalBusan 49241Republic of Korea Department of AI Convergence Network Ajou UniversitySuwon 16499Republic of Korea Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897Republic of Korea Korea Photonics Technology Institute Gwangju 61007Republic of Korea School of Biomedical Engineering Korea UniversitySeoul 02841Republic of Korea Interdisciplinary Program in Precision Public Health Korea UniversitySeoul 02841Republic of Korea Center

Individuals who are unable to walk independently spend most of the day in a *** population is at high risk for developing pressure injuries caused by ***,early diagnosis and prevention of these injuries still remain ***,we introduce battery-free,wireless,multimodal sensors and a movable system for continuous measurement of pressure,temperature,and hydration at skin *** device design includes a crack-activated pressure sensor with nanoscale encapsulations for enhanced sensitivity,a temperature sensor for measuring skin temperature,and a galvanic skin response sensor for measuring skin hydration *** movable system enables power harvesting,and data communication to multiple wireless devices mounted at skin-cushion interfaces of wheelchair users over full body *** evaluations and numerical simulations of the devices,together with clinical trials for wheelchair patients,demonstrate the feasibility and stability of the sensor system for preventing pressure injuries caused by sitting.

关键词： injuries modal mounted

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PUFFER: A Routability-Driven Placement Framework via Cell Padding with Multiple Features and Strategy Exploration 23

PUFFER: A Routability-Driven Placement Framework via Cell Pa...

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Proceedings of the 60th Annual ACM/IEEE Design Automation Conference

作者： Zhijie Cai Peng Zou Zhengtao Wu Xingyu Tong Jun Yu Jianli Chen Yao-Wen Chang State Key Lab of ASIC & System Fudan University Shanghai China Shanghai LEDA Technology Co. Ltd. Shanghai China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan and Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9798350323481

Placement is a critical stage in VLSI physical design, especially for routability optimization. Due to the large scale and high integration introduced by the advanced semiconductor manufacturing technology, there remains a significant challenge in routability in the placement stage, which will affect the subsequent routing process. This paper proposes a placement framework, called PUFFER, to optimize routability by cell padding and strategy exploration. The framework first estimates congestion by imitating the behaviors of routing detours and clustered cell spreading. Then it calculates cell padding based on multiple features inspired by the characteristics of convolutional and graph neural networks. Besides, it applies a Bayesian-based method to explore a better placement strategy. Compared with a commercial tool and the state-of-the-art academic RePlAce placer, experiments on industrial benchmarks show that our framework achieves the best routability on average, with a 2.7× speedup over the commercial tool.

关键词： physical design

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Development of Colour Sorting Robotic Arm Using TCS3200 Sensor 9

Development of Colour Sorting Robotic Arm Using TCS3200 Sens...

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9th IEEE Conference on System, Process and Control, ICSPC 2021

作者： Khairudin, Ahmad Rafiq Mohd Karim, Muhammad Hanif Abdul Samah, Asma Abu Irwansyah, Dyanatasya Yakob, Muhammad Yunus Zian, Norhaslina Mat Universiti Tenaga Nasional College of Engineering Department of Engineering Foundation and Diploma Studies Selangor Malaysia Universiti Kebangsaan Malaysia Faculty of Engineering and Built Environment Department of Electrical Electronics and System Selangor Malaysia Universiti Tenaga Nasional College of Graduate Studies College of Engineering Selangor Malaysia

ISBN: (纸本)9781665437639

Sorting objects or products manually in industries using human labour consumes time and energy, especially when it involves large volume of products. Human sorting operations could be replaced with robotic implementation, which would save time and effort while producing better results. Robotic arm is a type of programmable mechanical arm, almost similar to the human arm which is programmed to faithfully carry out repetitive actions with a high degree of accuracy. However, creating an artificial sense of touch that is comparable to human's has been challenging. One of the challenges is the detection of objects with different colours. In this work, a light intensity to frequency converter method is used to detect colour. The robotic arm is controlled by a DC servo motors microcontroller-based system. An IoT platform is being used to monitor the detection process, especially the counting for each sorted colour block. Furthermore, the study also performed a comparison of the robotic arm indoor and outdoor efficiency. The chosen TCS3200 sensor operates by distinguishing different generated frequencies for different light intensities. It could distinguish the colours at 95% in a bright condition and 91% in a dimmer condition, based on object detection at 5 cm away from the sensor. © 2021 IEEE.

关键词： Robotic arms

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