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A novel single-stage high power LEDs driver

A novel single-stage high power LEDs driver

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International conference on Power Electronics (ICPE)

作者： Chun-An Cheng Fu-Li Yang Chen-Wei Ku Chun-Hsien Yen Power Electronics Laboratory Department of Electrical Engineering I-Shou University Taiwan

the conventional two-stage driver for high-power light-emitting-diodes (LEDs) is composed of a power-factor-correction (PFC) converter with a buck converter or a flyback converter for adjusting the voltage/current for supplying LEDs. However, large numbers of circuit components are required and the total efficiency is limited due to two-stage power conversion. this paper proposes a single-stage dimmable driver for high-power-rated LEDs. the presented circuit combines a buck-boost PFC converter with a flyback converter into a single-stage power-conversion circuit. the proposed driver offers high power factor, high efficiency, cost-effectiveness and a constant-output-voltage control scheme. Finally, a prototype driver is developed and tested in order to supply 100W LEDs with universal utility-line input voltages. Operational analysis, design equations, a design example, and experimental results demonstrate the feasibility of the proposed circuit.

关键词： Light emitting diodes Driver circuits Inductors Voltage measurement optical switches Capacitors

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the recent research on virtual prototyping engineering for complex products

The recent research on virtual prototyping engineering for c...

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International conference on Computer Supported Cooperative Work in design

作者： Bo Hu Li Xudong Chai Wenhai Zhu Yanqiang Di Xiao Song Xuefeng Yan Peng Wang Baocun Hou Gouqiang Shi Xiaohua Wang Beijing Aeronautics and Astronautics University Beijing China Beijing Simulation Center Beijing China CS Department Beijing Institute of Technology Beijing China Computer Science & Technology Institute Harbin Institute of Technology Harbin China

ISBN: (纸本)0780379411

In recent years, based on the previous research work, "virtual prototyping engineering for complex product (CPVPE)" project, combined with current technology developments and application requirements, is further studied and practiced. Some latest research results gained are introduced in this work in detail, which include the collaborative simulation grid based system technology for CPVPE, component based collaborative modeling and simulation technology for CPVP (complex product virtual prototype), multidisciplinary design optimization technology for CPVP, collaborative virtual environment technology, collaborative simulation grid platform based supporting environment technology for CPVPE, etc. Furthermore, a tools suit for CPVPE, namely COSIM-grid, developed by authors and their colleagues is presented. At last, some typical cases based on COSIM-grid are also presented.

关键词： Virtual prototyping design engineering Space technology design optimization Collaboration Collaborative work Virtual environment Automotive engineering Systems engineering and theory Collaborative tools

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A Novel Online Method for Monitoring the Junction Temperature Based on the Input and Output of the Inverter

A Novel Online Method for Monitoring the Junction Temperatur...

引用

International Conf on Electrical and Electronic engineering (ICEEE)

作者： Guoqing Xu Huili Wu Zhengyun Pan Weiwei Wei Yanhui Zhang School of Mechatronic Engineering and Automationname Shanghai University Shanghai China Hefei Design and Research Institute of Coal Industry Co. Ltd. Anhui China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China

Junction temperature is an important performance parameter for the operation of power semiconductor devices and it is also one of the main factors leading to device failure. this paper proposes a novel online method for monitoring the junction temperature based on the input and output of the inverter. By obtaining the input and output voltage and current of the inverter, the turn-off transient waveform of each power device can be extracted to calculate the turn-off loss. then the reliability state monitoring of the power device can be realized according to the E_off - I_c- T_j mapping table. Results show that this method can obtain the turn-off loss E_off in each control cycle to predict and monitor the real-time junction temperature T_j of each power device. It has the advantages of easy measurement, non-invasiveness and good applicability.

关键词： Temperature measurement Temperature sensors Temperature distribution Semiconductor device measurement optical variables measurement Inverters Data mining

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Development challenges for ambient light sensor packages

Development challenges for ambient light sensor packages

引用

IEEE 56th Electronic Components and Technology conference

作者： Kim, Young-Gon Kelkar, Nikhil Intersil Package Engineering 1001 Murphy Ranch Rd. Milpitas CA 95035

ISBN: (纸本)1424401526

Ambient Light Sensor (ALS) products are gaining popularity as one of the most effective solution for power management and display quality enhancement in electronic products and systems. the battery life for mobile phones, notebook computers, PDAs, and digital cameras can be extended significantly by automatic brightness control through ambient light sensor (ALS) feedback. A recent study shows that the display backlight represents one-third of the total battery drain in a notebook computer [1]. It is also possible to achieve a more comfortable display quality with human eye-like sensing features. Automotive applications, room lighting, and advanced color sensing are other application areas for ALS that have been changing our daily life. Intersil has successfully developed ALS products with 5-, 6-, and 8-pin package configurations. Figure 1 shows an example of an ALS product, EL7900, with a compact 5-pin QFN package format. EL7900 and ISL29000 are light-to-current optical sensors, integrating a photodiode and current amplifier for a simple current output sensor. Intersil has also developed light to digital output sensors in 8-pin packages, namely, ISL29001 and ISL29002, combining a photodiode, current amplifier, filter, ADC and an I2C output. Although ALS market is growing rapidly, supporting IC packaging technology is leveling its nascent phase. Package design, clear epoxy materials, package reliability, and infrastructure, such as common footprint standards and test hardware, need to be improved. the first half of this paper reviews ALS package development challenges primarily related to the clear epoxy. the second half of this paper reviews ALS packages available in the market based on information in public domain. Findings and recommendations are summarized at the end of the paper. © 2006 IEEE.

关键词： Electronics packaging

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Low Loss, Large Bandwidth Antiresonant Hollow-Core Fiber design for Short-Reach Links

Low Loss, Large Bandwidth Antiresonant Hollow-Core Fiber Des...

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2020 optical Fiber Communications conference and Exhibition, OFC 2020

作者： Shere, William Jasion, Gregory T. Numkam Fokoua, Eric Poletti, Francesco University of Southampton Optoelectronics Research Centre Faculty of Engineering and Physical Sciences United Kingdom

We present antiresonant hollow-core optical fibre designs for VCSEL-based short-reach transmission applications in the 850nm band. Our simulations show that lower loss and twice the bandwidth of solid, multi-mode, gra... 详细信息

ISBN: (纸本)9781943580712

关键词： Bandwidth

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Lateral mode behaviour in diode lasers based on coupled ridges 7

Lateral mode behaviour in diode lasers based on coupled ridg...

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7th International School and conference "SaintPetersburg OPEN 2020" on Optoelectronics, Photonics, engineering and Nanostructures

作者： Epanchinova, A.A. Payusov, A.S. Kornyshov, G.O. Serin, A.A. Kulagina, M.M. Zhukov, A.E. Gordeev, N.Yu. Maximov, M.V. Peter the Great St Petersburg Polytechnic University 29 Polytechnicheskaya St Petersburg195251 Russia Ioffe Institute 26 Polytechnicheskaya St Petersburg194021 Russia St. Petersburg Academic University 8/3 Khlopina St Petersburg194021 Russia National Research University Higher School of Economics 16 Soyuza Pechatnikov St Petersburg190008 Russia

We present a study of diode lasers with two identical optically coupled ridges. Two coupled ridges were made gradually divergent to a distance of 50 μm which allowed creating three electrically isolated sections within a single laser. We carried out numerical simulations of the electromagnetic modes in the coupled ridge waveguide and calculated far-field patterns for each mode. the results are in good agreement with the experimental data. We have found that current spreading provided unwanted optical gain in the active region in between ridges and dramatically changed the structure of the lasing modes. the obtained numerical and experimental results can be used to design twin-ridge diode lasers able to operate in mode-locking regimes. © Published under licence by IOP Publishing Ltd.

关键词： Semiconductor lasers

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Low loss, large bandwidth antiresonant hollow-core fiber design for short-reach links

Low loss, large bandwidth antiresonant hollow-core fiber des...

引用

optical Fiber Communication conference, OFC 2020

作者： Shere, William Jasion, Gregory T. Fokoua, Eric Numkam Poletti, Francesco Optoelectronics Research Centre Faculty of Engineering and Physical Sciences University of Southampton United Kingdom

ISBN: (数字)9781943580712

ISBN: (纸本)9781943580712

关键词： Bandwidth

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Recent developments in magneto-optic garnet-type thin-film materials synthesis

Recent developments in magneto-optic garnet-type thin-film m...

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7th International conference on Materials for Advanced Technologies, ICMAT 2013

作者： Nur-E-Alam, Mohammad Vasiliev, Mikhail Kotov, Viacheslav Alameh, Kamal Electron Science Research Institute Edith Cowan University 270 Joondalup Drive Joondalup WA 6027 Australia Institute of Radio Engineering and Electronics RAS 11 Mohovaya St Moscow 125009 Russia

Magneto-optic (MO) garnets are used in a range of applications in nanophotonics, integrated optics, communications and imaging. Bi-substituted iron garnets of different compositions are the most useful class of materials in applied magnetooptics due to their excellent MO properties (large Faraday effect) and record-high MO figure of merit among all semitransparent dielectrics. It is highly desirable to synthesise garnets which possess simultaneously a high MO figure of merit and large uniaxial magnetic anisotropy. However, the simultaneous optimization of several material properties and parameters can be difficult in single-layer garnet thin films, and it is also challenging to prepare films with high bismuth content using physical vapor deposition technologies. To meet the current challenge of developing next-generation functional MO materials, we design, develop and demonstrate the functionality of new magnetostatically-altered all-garnet multilayer heterostructures using two different garnet materials of dissimilar anisotropy types (out-of-plane and almost-inplane). the multilayer structures possess simultaneously a high MO figure of merit and large uniaxial magnetic anisotropy together with low coercivity, if each of the layers is optimized in composition and annealed correctly. We prepare thin-film heterostructures by sandwiching a MO garnet layer with almost in-plane magnetization in-between two MO garnet layers with out-of-plane magnetization using RF sputtering. We apply customised high-temperature oven annealing processes (optimized in temperature and process durations after running many trials) for the as-deposited (amorphous) garnet multilayers to obtain the crystalline garnet phase in every layer. these structures then possess simultaneously a high optical/MO quality and low coercivity, which is very attractive for the development of magnetic photonic crystals, sensing devices and ultra-fast switches. Based on Bi-substituted ferrite garnets grown on garn

关键词： Magnetos

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980 nm InGaAs/AlGaAs quantum well lasers with extremely low beam divergence

980 nm InGaAs/AlGaAs quantum well lasers with extremely low ...

引用

IEEE International Semiconductor Laser conference

作者： Shun-Tung Yen Gray Lin Der-Cherng Liu Chia-Ming Tsai Chien-Ping Lee Department of Electronics Engineering National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)078033163X

We report on the fabrication of 980 nm InGaAs-AlGaAs lasers with a specially designed cladding structure. For a 2.5 /spl mu/m wide ridge waveguide structure, the far field pattern has a vertical divergence of only 13/spl deg/ and a lateral divergence of 8/spl deg/. Meanwhile, the threshold current can remain acceptably low. In addition, with another design, a record small vertical far field angle of 11/spl deg/ was obtained.

关键词： Indium gallium arsenide Quantum well lasers Laser beams threshold current Waveguide lasers optical design Fiber lasers Pump lasers optical waveguides Laser theory

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Research on the Lightweight Detection Network of Abandoned Objects in Freeway based on Video 6

Research on the Lightweight Detection Network of Abandoned O...

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6th International conference on Traffic engineering and Transportation System, ICTETS 2022

作者： Liu, Wenjun Li, Jian Liu, Yipeng Ma, Chuanyi Xu, Jiabin Liu, Chunyu Shandong Transportation Institute No. 1877 Gangxi Road Licheng District Shandong Jinan250100 China Shandong Hi-Speed Group Co. Ltd No. 8 Longao North Road Lixia District Shandong Jinan250014 China School of Qilu Transportation Shandong University No. 17923 Jingshi Road Lixia District Shandong Jinan250014 China Shandong High Speed Zibo Develop CO. LTD Nanjiao Town Zhoucun District Shandong Zibo256100 China School of Civil Engineering Shandong Jianzhu University 1000 Fengming Road Ganggou Street Licheng District Shandong Jinan250100 China

ISBN: (纸本)9781510663053

In view of the problems of many parameters, complex network and too much memory occupied by the current target detection algorithm based on convolutional neural network in the edge computing equipment, a video based lightweight convolutional neural network YOLOv5-MN3 for Abandoned Objects in Freeway is proposed. Firstly, we reduce the network parameters and the amount of computation by changing the backbone network architecture and replacing the standard convolution with the deep separable convolution;Secondly, the paper enhances the feature extraction ability of neural network by integrating attention mechanism, and improves the recall and accuracy of model detection;Finally, through knowledge distillation to further compress the model, we completed the design of lightweight network. the experimental results showed that the average accuracy of YOLOv5-MN3 network can reach 88.2%, which is 38.68% smaller than the original network. therefore, the network met the requirements of edge computing device deployment. © 2023 SPIE.

关键词： Convolution

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