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Boost dC-dC converter with regenerative snubber

Energy Reports 2024年 12卷 798-819页

作者： Yau, Yeu-Torng Department of Ph.D. Program Prospective Technology of Electrical Engineering and Computer Science National Chin-Yi University of Technology Taichung Taiwan Department of Electrical Engineering National Chin-Yi University of Technology Taichung Taiwan

To accommodate the wide range of input voltages supplied by redundant batteries and ensure an adequate hold-up time for communication systems during utility power failures, power supplies used in 5 G base stations typically include a front-end boost converter as the first stage and a second-stage isolated converter. In this paper, a new topology for a regenerative snubber in boost converters is proposed. Compared to traditional active or passive snubber topologies, the proposed snubber offers the advantages of having fewer components and occupying less space. Moreover, it does not require additional active devices and can be driven by widely-used commercial PWM control integrated circuits, achieving a higher level of cost-effectiveness and offering increased industrial applications. The final prototype of a power supply for a networking switch hub (as used in 5 G base stations) is fabricated to demonstrate the feasibility of the proposed method. © 2024 The Authors

关键词： Topology

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Boost dC-dC Converter with Non-dissipative Snubber

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IEEJ Transactions on electrical and Electronic engineering 2024年第11期19卷 1858-1878页

作者： Yau, Yeu-Torng Department of Ph.D. Program Prospective Technology of Electrical Engineering and Computer Science National Chin-Yi University of Technology Taichung No.57 Sec. 2 Zhongshan Rd. Taiping Dist Taichung41170 Taiwan

To provide a hold-up time function in dC-dC supplies for cell site stations or data centers, using a boost converter with a bulk output capacitor as a front-end converter stage is a simple and highly cost-effective solution. However, conventional boost converters with a hard-switching operation result in low conversion efficiency and increased electromagnetic interference emissions. In this paper, a boost converter with a new non-dissipative snubber is proposed that only requires two additional diodes, an inductor, and a multilayer ceramic capacitor. The main feature of the proposed snubber is that the components are not located on the main power processing path. This means they only require low ratings, improving cost-effectiveness. A prototype converter is analyzed, realized, and applied to a 300 W redundant dC-dC power supply module for a 5G cell base station. © 2024 The Author(s). IEEJ Transactions on electrical and Electronic engineering published by Institute of electrical Engineers of Japan and Wiley Periodicals LLC. © 2024 The Author(s). IEEJ Transactions on electrical and Electronic engineering published by Institute of electrical Engineers of Japan and Wiley Periodicals LLC.

关键词： Boost converter

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High-Efficiency Microinverter With Interleaved Switching and Asymmetrical Unipolar Modulation 6

High-Efficiency Microinverter With Interleaved Switching and...

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6th International Future Energy Electronics Conference, IFEEC 2023

作者： Lu, Che-Yu Hsieh, Ming-Yueh National United University Department of Electrical Engineering Miaoli Taiwan National United University Ph.D. Program in Materials and Chemical Engineering Miaoli Taiwan

ISBN: (纸本)9798350339888

This paper introduces a high-efficiency two-stage power microinverter. In the dc-dc stage, a three-phase interleaved inverse buck-type converter is adopted to regulate the dc-bus voltage and improve the input ripples. A band-stop filter and a PR controller are employed to eliminate the double-line frequency ripple. Furthermore, a highly reliable inverter combines an H-bridge topology and two low-frequency switches. Interleaved switching and asymmetrical unipolar modulation are used to improve conversion efficiency. The high and low switching frequency legs synchronization minimizes distortion on the output voltage waveform. Finally, all control algorithms are implemented in a TI dSP TMS320F28069 chip. A 2 kW prototype utilizing GaN devices has been developed and verified. The average efficiency of the overall system achieves 98%. © 2023 IEEE.

关键词： Gallium nitride

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Micro-Cantilever Array With Electroplating Tin Bumps for Flip-Chip Bonding Technology

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IEEE Transactions on Components, Packaging and Manufacturing Technology 2023年第12期13卷 2040-2045页

作者： Hu, Zihsong Liou, Chengshiun Tsou, Chingfu Feng Chia University Department of Automatic Control Engineering Taichung40724 Taiwan Institute of Nano Engineering and Microsystems National Tsing Hua University Hsinchu30013 Taiwan Feng Chia University Doctorate Degree of the Ph.D. Program of Electrical and Communications Engineering Taichung40724 Taiwan

A Nickel (Ni) microcantilever beam array with tin (Sn) solder bumps has been designed for flip-chip bonding with high-density electrodes. Micro-electro-mechanical system (MEMS) technology and the micro-electroplating process were used in the fabrication process. Utilizing the out-of-plane deformation of the suspended microcantilever beam, the satisfied heights partially compensate the substrate curvature to ensure a high flip-chip bonding yield, thus, improving package quality in terms of electrical connections. To demonstrate this technique, this study developed a flip-chip carrier for a typical micro-LEd array with a beam length of 70~ μm and a bump height of 2~ μm. The measurement results revealed that the displacement of the microcantilever beam was approximately 0.8~ μm when a 500~ μN force was applied on top of the tin bump. When a glass substrate directly mounts to the flip-chip carrier through the tin bump at a heat reflow of 270 °C, most of the tin bumps successfully melt and solidify, which results in good bonding performance. These results revealed that the proposed approach could be applied to the wafer-level packaging process with high-density ball grid array electrodes. © 2011-2012 IEEE.

关键词： Flip chip devices

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A High-step-down Converter with Negative Output Voltage 11

A High-step-down Converter with Negative Output Voltage

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11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Yau, Yeu-Torng Luu, Thanh-phu. National Chin-Yi University of Technology Ph.D. Program Ptoeecs Taichung Taiwan National Chin-Yuuuuuuui University of Technology Department of Electrical Engineering Taichung Taiwan

ISBN: (纸本)9788957083505

This paper proposes a new high step-down converter with negative voltage output, which has the following advantages: (1) Compared to conventional buck-boost or SEPIC converters, the proposed converter operates with zero voltage turn-on function. (2) The voltage gain of this circuit does not contain non-linear components, and the control is simple and can be driven by existing buck control ICs. (3) due to the dC blocking capacitor between the output and input terminals, the high voltage at the input will not pass through to the output when the converter fails to be controlled. The load is protected. Finally, a prototype is completed and the proposed method is verified to be feasible. © 2023 The Korean Institute of Power Electronics.

关键词： Buck-Boost converter

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Visual Field Examination Technology Based on Semi-transparent Elliptical Mirror 6

Visual Field Examination Technology Based on Semi-transparen...

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6th IEEE Eurasian Conference on Educational Innovation, ECEI 2023

作者： Chang, Chao-Kai Chiang, Chun-Yu Yeh, Feng-Ming Lee, Chi-Hung Tien, Chuen-Lin Chen, der-Chin Department of Optometry Yuanpei University of Medical Technology Hsinchu Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan Department of Electrical Engineering Feng Chia University Taichung Taiwan

ISBN: (纸本)9798350334289

In this study, the human visual field test technology is established by using an optoelectrical system consisting of a translucent ellipsoid, an area light source, and a landscape scene with an indicator. during the test, the subjects stared at the indicator directly in front of them with one eye and kept their eyeballs still, scanning the light strip with peripheral vision and using the mouse button plus the playback program to record the start and end positions of the scanning light strip in the landscape scene. This method is tested subjectively, and the subject needs to respond during the test. Therefore, before the test, the subject needs to understand the test process and be trained in advance to improve the exam accuracy. In the experiment, fifteen subjects with normal vision and no eye disease were selected. Their visual fields were confirmed normal after a preliminary assessment. The test results showed that the subjects' eyes were within the normal visual field, indicating that this method was feasible. In this research, a digital optical platform for the near visual field is proposed to establish an optoelectric visual field measurement technology. The proposed method is characterized by small size, rapid operation, and easy portability. With the digital LCd and visual imaging technology, both dynamic and static visual fields can be tested. The test data on the eyes' upper, lower, nasal, and temporal sides were consistent with the normal visual field. This shows that this method is feasible and worthy of promotion in the optometry industry. © 2023 IEEE.

关键词： Light sources

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New type of optical machine system for object depth sensing

New type of optical machine system for object depth sensing

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Optical Technology and Measurement for Industrial Applications Conference 2023

作者： Chen, Kun-Huang Hung, Sheng-Chun Cheng, Chia-Cheng Lan, Tian-Le Dept. of Electrical Engineering Feng Chia Univ. 100 Wenhwa Road Seatwen Taichung Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia Univ. 100 Wenhwa Road Seatwen Taichung Taiwan

ISBN: (纸本)9781510663411

An optical machine system for measuring the depth distance of an object was proposed. This system can scan a region by obtaining the relationship curve between focus distance and motor step. The depth distance was acquired by determining whether the captured objects was in focus or not by discerning the sharpness of the object’s outline, with the motor step when the object was in focus. This system has been verified its feasibility in the experiment and has the merits of a larger sensing range, lower manufacturing cost, and can be used outdoors. © 2023 SPIE · 0277-786X ·

关键词： Optical instruments

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Compact Refractive Error Measuring device 6

Compact Refractive Error Measuring Device

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6th IEEE Eurasian Conference on Educational Innovation, ECEI 2023

作者： Yeh, Feng-Ming Chiang, Chun-Yu Chang, Chao-Kai Wang, Hsuan-Fu Tien, Chuen-Lin Chen, der-Chin Department of Optometry Yuanpei University of Medical Technology Hsinchu Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan Department of Aeronautical Engineering National Formosa University Yunlin Taiwan Department of Electrical Engineering Feng Chia University Taichung Taiwan

ISBN: (纸本)9798350334289

In this study, a reflective aspheric optical system is used to establish an eye examination device for distance and near vision tests. The system includes a micro-display with a rotating device, an off-axis parabolic mirror, an off-axis ellipsoid mirror, a chin-fixing bracket, and vision software. The display contents of the micro-display include English C and E charts, Chinese words, graphics, and animation. The off-axis parabolic mirror and off-axis ellipsoid mirror are confocal, and the micro-display is placed at the confocal point. The micro-display is projected through an off-axis parabolic mirror for myopia's distance vision testing, and an off-axis elliptical mirror for myopia's near vision testing. Others, the graphics and animation, provide visual checks for young children. In addition, CCd cameras and AI recognition can be used as visual examinations for people with language impairment. In this study, twenty-five subjects with the refractive error were tested using E-chart and this device to obtain the decimal point VA value, and the trial frame and lens were used to obtain the diopter of glasses. The date of the experimental results was used as a reference value for ophthalmological examination. This system uses an off-axis parabolic mirror and an off-axis ellipsoidal mirror. Optical alignment is a challenge to solve for the system. Students participating in the study obtained good optics training. The advantages of the developed device include the convenience to carry with a multi-purpose and straightforward use. © 2023 IEEE.

关键词： Mirrors

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Integrating physical Wheelchairs and Virtual Basketball for Enhanced Access and Enjoyment in Wheelchair Basketball 6

Integrating Physical Wheelchairs and Virtual Basketball for ...

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6th IEEE International Conference on Artificial Intelligence and eXtended and Virtual Reality, AIxVR 2024

作者： Hsu, Yu-Hung Fang, Iuan-Kai Wang, Chun Chen, Jui-Chien Hu, Min-Chun National Tsing Hua University Department of Computer Science Hsinchu Taiwan National Tsing Hua University International Intercollegiate Ph.D. Program Hsinchu Taiwan National Taiwan University Department of Electrical Engineering Taipei Taiwan University of Texas at Austin School of Information United States

ISBN: (纸本)9798350372021

Wheelchair basketball for people with disabilities is a niche market with limited attention and resources due to its smaller scale. We utilize the characteristics of VR technology, combining wearable devices with physical wheelchair seating, to create a virtual and real interactive game of wheelchair basketball. This enables people with disabilities to exercise at home and allows the general public to experience the challenges of disability sports, fostering empathy and emphasizing the importance of social justice. © 2024 IEEE.

关键词： Virtual reality

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Integrating Visual SLAM and Smooth Speed Control for Realizing Real-Time Autonomous System

Integrating Visual SLAM and Smooth Speed Control for Realizi...

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International Conference on Computer and Automation engineering, ICCAE

作者： Mao-Jen Ko Yu-Chen Lin Chih-Hung Cheng Thanh-Tan Nguyen Department of Automatic Control Engineering Feng Chia University Taichung Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan

ISBN: (数字)9798350370058

ISBN: (纸本)9798350370164

In recent years, the rapid development of autonomous system technology has increasingly positioned it as a crucial player in modern transportation. Appropriate speed planning emerges as one of the key elements for achieving safe and efficient autonomous system operations. Speed planning not only requires adherence to road speed limits and ensuring safe distances to avoid collisions but also necessitates consideration for ensuring passenger comfort. This paper proposes a method that restricts acceleration and jerk to achieve smooth speed control, enabling autonomous system to emulate the driving style of human drivers. Utilizing visual SLAM for feature extraction and matching on images, a sparse point cloud three-dimensional map of the environment is constructed. The recorded path is tracked using the Pure Pursuit algorithm. Finally, this paper will validate the proposed approach through an embedded system deployed in a real vehicle. The integration of visual SLAM and smooth speed control technology realizes a real-time and smooth autonomous system, providing a safer autonomous system experience.

关键词： Point cloud compression Visualization Simultaneous localization and mapping Autonomous systems Velocity control Feature extraction Real-time systems

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