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3rd International Scientific Symposium "Intelligent Solutions", IntSol 2023

作者： Kirichenko, Lyudmyla Zhadan, Artur Selivanova, Alla Kharkiv National University of Radio Electronics Nauky av. 14 Kharkiv61166 Ukraine Odesa National University of Technology Kanatnaya str. Odessa65039 Ukraine

Poor-quality artificial light sources can be harmful to health and affect the productivity of workers in the workplace. This research focuses on the effects of pulse-width modulation (PWM) of artificial light sources such as displays or lamps on the human body. The main objective of the research is to make the process of checking the workplace for the presence of pulse-width modulation (PWM) more accessible and to minimize the negative impact of pulse-width modulation (PWM) on the human body. To achieve this goal, an alternative method of monitoring the pulse-width modulation (PWM) of artificial light sources has been developed using artificial intelligence (AI) methods that can even be used on a smartphone. The results of this research can be applied in the field of occupational safety and health (OSH). © 2023 Copyright for this paper by its authors.

关键词： pulse width modulation

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Simulation Research on Double-Action Variable Displacement Mechanism Based on Flow pulse width modulation Technology 9

Simulation Research on Double-Action Variable Displacement M...

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9th International Conference on Fluid Power and Mechatronics, FPM 2023

作者： Xiuwen, Xu Yan, Ren Wei, Xiang Jia Jian, Ruan School of Mechanical and Electrical Engineering Wenzhou University Zhejiang Wenzhou China College of Mechanical Engineering Zhejiang University of Technologty Zhejiang Hangzhou China

ISBN: (纸本)9798350304947

The realization of double-action variable pump with plunger pump requires complex variable mechanism, and the new digital pump also has the defects of low control accuracy and low response speed. This paper presents a new double-action variable mechanism based on flow pulse width modulation technology, which is similar to a three-position four-way switching valve and can realize double-action variable function in combination with the constant displacement pump. The unique saw tooth groove structure on the valve sleeve of the double-action variable mechanism can cooperate with the rhombic windows on the spool to form a periodically changing through flow hole when rotating, so that the oil is discretized and exhibits signal-like behavior. By changing the duty cycle of PWM wave through the axial displacement of the spool, the output effective flow can be adjusted. The simulation results show that the new mechanism with compact structure can meet the demand of double-action variable output. © 2023 IEEE.

关键词： pulse width modulation

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Imaginary Coordinate System Based Space Vector pulse width modulation of a Cascaded H-Bridge Multilevel Inverter 11

Imaginary Coordinate System Based Space Vector Pulse Width M...

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11th National Power Electronics Conference, NPEC 2023

作者： Pandey, Anuj K. Ahmed, Irfan Nit Durgapur Durgapur India Bit Sindri Dhanbad India

ISBN: (纸本)9798350311648

This paper mainly focusses on the imaginary coordinate transformation technique based Space Vector pulse width modulation (SVPWM) of a multilevel inverter. Imaginary coordinate system based SVPWM involves simpler calculations. It does not use any look-up table or trigonometric calculations and eliminates redundant vectors. The SVPWM scheme based on the imaginary coordinate system proposed in this paper works on minimum device switching frequency which in turn reduces the switching loss, thereby increasing the overall efficiency of the inverter. A step-by-step implementation of an imaginary coordinate transformation technique based pulse width modulation of a cascaded H-Bridge multilevel inverter is detailed here. The proposed technique is simulated for a five-level inverter and validated using MATLAB/Simulink. The simulation results show that the proposed technique gives better performance when compared with the conventional SVM techniques. The proposed technique is perfectly general and can be extended to any n level multilevel inverter. © 2023 IEEE.

关键词： pulse width modulation

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Simplified Space Vector pulse width modulation for Four-Level Neutral Point Clamped Inverter

Simplified Space Vector Pulse Width Modulation for Four-Leve...

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2023 International Symposium on Electrical and Electronics Engineering, ISEE 2023

作者： Pham, Le Nam Dung Phan, Quoc Nguyen, Nho-Van Ho Chi Minh University of Technology Vietnam National University Ho Chi Minh City Faculty of Electrical and Electronics Engineering Ho Chi Minh City Viet Nam

ISBN: (纸本)9798350315486

Multilevel inverters have become a suitable candidate for high power applications due to their output performance and power density. In particular, Four-level neutral-point-clamped inverter (NPC) has received a lot of attention due to the demands of commercial and industrial applications requiring higher DC link voltages and ever-improved power quality compared to three-level inverter. One of the primary challenges for multilevel inverters is that the space vector diagram for modulation schemes becomes complex as the number of voltage levels increases. This paper presents a Simplified space vector pulse width modulation (SSVPWM) for four-level neutral point clamped inverter to overcome this issue. This method reduces the quantity of sub-regions for a four-level inverter space vector diagram, compared to the conventional space vector PWM method. Furthermore, the space vector diagram of the four-level converter is transformed into a two-level space vector diagram, which reduces complexity and computation burden. Performance of the SSVPWM method is verified through the simulation results. © 2023 IEEE.

关键词： pulse width modulation

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Medium-Voltage Drives (MVD) - pulse width modulation (PWM) Techniques 2

Medium-Voltage Drives (MVD) - Pulse Width Modulation (PWM) T...

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2nd International Conference on Electronics and Renewable Systems, ICEARS 2023

作者： Alahmad, Adil Kacar, Firat Farsakoglu, Omer Faruk Uzunoglu, Cengiz Polat Istanbul University Cerrahpaşa Electrical-Electronics Engineering Institute of Science and Technology Ankara Turkey Kilis 7 Aralik University Electrical-Electronics Engineering Institute of Science and Technology Kilis Turkey

ISBN: (纸本)9798350346640

In order to keep up with rising customer demand, more and more MVDs are being used to fuel MV motors. Power delivery to a load may be modulated by changing the pulse width. A digital signal might be transformed into an analog one using the pulse width modulation (PWM) technique. A pulse-width modulated (PWM) signal, which takes the form of a rectangular wave, alternates between ON and OFF states. The characteristics of a pulse-width modulation (PWM) signal are determined by its frequency and duty cycle. The inverter's switching and harmonic losses may be minimized by using PWM technology. In order to cut down on switching loss, hybrid PWM inverters operate half of their switches at low frequencies while operating the other half at high frequencies. Because switching loss and heat dissipation from switches are unpredictable, system reliability is reduced. It's possible that switching will lead to poor heat dissipation and power losses. However, problems like these may be lessened with the use of a PWM technique. By alternating between low-frequency and high-frequency signals, the output voltage and frequency may be adjusted, which in turn reduces the power supply's harmonic content. Methods such as Multiple Space Vector modulation, Selective Harmonic Elimination, Multilevel Carrier Phase Shifted, and Multilevel Carrier Level Shifted pulse width modulation has been considered. However, although these methods effectively reduce higher-order harmonics, it is more complex to increase inverter efficiency in a way that does not introduce additional losses. To eliminate these harmonics, a filter is made. Comparisons are made between sinusoidal PWM, PWM with a phase angle of sixty degrees, and trapezoidal PWM in terms of performance. The study tracked the effects of modulation index and carrier frequency adjustments on inverter output. © 2023 IEEE.

关键词： pulse width modulation

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Dual Random Noise Suppression Strategy for Permanent Magnet Synchronous Motor Based on Random pulse width modulation and Random High-frequency Injection Method 4

Dual Random Noise Suppression Strategy for Permanent Magnet ...

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2023 4th International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2023

作者： Wang, Dongwen Ren, Jingzhou Sun, Rui Zhang, Mengfei National Key Laboratory of Metallurgical Intelligent Manufacturing System Automation Research and Design Institute of Metallurgical Industry Beijing100071 China Harbin First Machinery Group Co. Ltd. Harbin150000 China

This study proposes an innovative dual control strategy to tackle the challenge of electromagnetic noise in the sensorless low-speed operation of Permanent Magnet Synchronous Motors (PMSM). The strategy combines random pulse width modulation (PWM) technology with a stochastic high-frequency injection approach. By incorporating two distinct randomized frequency switching techniques into the high-frequency injection circuit, the method integrates two-state Markov chains into both PWM technology and the random high-frequency injection method. Subsequently, a mathematical model for signal processing is developed, and extensive simulation and experimental verification are conducted. The experimental findings affirm the effectiveness of this approach in effectively mitigating electromagnetic noise while ensuring accurate location estimation within an acceptable range. © Published under licence by IOP Publishing Ltd.

关键词： pulse width modulation

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Performance evaluation of new spraying system for cotton defoliation using pulse width modulation technology and robotics in Blackville, South Carolina

Performance evaluation of new spraying system for cotton def...

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2023 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2023

作者： Neupane, Jyoti Maja, Joe Mari Miller, Gilbert Marshall, Michael Cutulle, Matthew Luo, Jun Barnes, Edward Department of Agricultural Sciences Clemson University 240 McAdams Hall ClemsonSC29634 United States Edisto Research and Education Center Clemson University 64 Research Road BlackvilleSC29817 United States Department of Plant and Environmental Sciences Clemson University 171 Poole Agricultural Center ClemsonSC29634 United States School of Mathematical and Statistical Sciences Clemson University Martin O‐15 ClemsonSC29634 United States Cotton Incorporated 6399 Weston Parkway CaryNC27513 United States

ISBN: (纸本)9781713885887

Cotton defoliation is the shedding of leaves and is one of the major factors that influence mechanical harvesting, yield, and fiber quality. The untimely and inadequate defoliation by natural processes interferes the mechanical harvesting. Therefore, cotton leaves are artificially defoliated by applying chemical defoliants. A plethora of research work has been done on cotton defoliation using conventional spraying systems, but very limited research has been conducted to study the effect of bottom defoliation on yield and fiber quality using unmanned ground vehicles and pulse width modulation. Thus, research was conducted to develop and evaluate a new spraying system using pulse width modulation and robotics. The research utilizes a complete randomized design with three treatments (20%, 40%, and 60% duty cycle) and four replications. The objectives of the study are to determine the droplet's characteristic using water-sensitive papers and to identify the fiber yield and quality. The results showed that the 20% duty cycle has the same effect as 60% on droplet distribution. Similarly, cotton yield was statistically insignificant on both fields (p-value 0.51 and 0.059 for field 1 and field 2, respectively). The defoliants could be applied safely at either duty cycle without compromising most of the fiber quality parameters except for nep/gm, length (Ln), L (5%), SFC, trash content in field 1, and micronaire, nep size, length (Ln), L (5%), SFC, and fiber fineness in field 2 which were significant. The new spaying system could be a potential solution to decrease chemical use and to achieve proper defoliation. © 2023 ASABE Annual International Meeting. All Rights Reserved.

关键词： pulse width modulation

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A 10-Bit 1280 x 720 Micro-LED Display Driver With 2-Transistor Pixel Circuits and Current-Mode pulse width modulation

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IEEE SOLID-STATE CIRCUITS LETTERS 2022年 5卷 134-137页

作者： Lee, Pei-Yi Lai Li, Sheng Hui Hung, Tzu Yi Yang, Ya-Wen Li, Sih-Han Sun, Jian-Jhih Lin, Chih-Wei David Lu, Chih-Wen Fang, Yen-Hsiang Kuo, Wei-Hung Huang, Li-Chun Su, Guo-Dung John Chen, Poki Natl Tsing Hua Univ Dept Engn & Syst Sci Hsinchu 30013 Taiwan Natl Taiwan Univ GIPO Taipei 10617 Taiwan Ind Technol Res Inst Elect & Optoelect Syst Res Labs Hsinchu 310401 Taiwan Natl Yang Ming Chiao Tung Univ Inst Photon Syst Tainan 71150 Taiwan Natl Taiwan Univ Sci & Technol Dept Elect & Comp Engn Taipei 10607 Taiwan

This study proposes a 1280 x 720 micro-LED display driver with 10-bit current-mode pulse width modulation. A two-transistor pixel circuit and a precharge scheme are proposed. A 1280 x 720 micro-LED display driver with 3969 pixels per inch was fabricated using standard 0.18-mu m CMOS technology. The measured maximal DNL and INL values were 0.33 and 1 LSB, respectively. A 1280 x 720 common-cathode micro-LED array was bonded on the display driver chip;hence, the feasibility of the display driver was verified. The display was successfully lit up at a 90-Hz frame rate and a power consumption of 76.3 mW.

关键词： Micro-LED display micro-LED display driver pulse width modulation

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Common-Mode Voltage Suppression Method for MMC under Submodule Unified pulse width modulation 14

Common-Mode Voltage Suppression Method for MMC under Submodu...

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14th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2023

作者： Pan, Bolun Chen, Canfeng Jiao, Jiancheng Li, Mengwei Zhang, Kai Dong, Qiang Huazhong University of Science and Technology Power Electronics and Energy Management Key Laboratory Ministry of Education of China School of Electrical and Electronic Engineering Wuhan China Qiongtai Normal University Hainan China

ISBN: (纸本)9798350328233

Submodule unified pulse width modulation (SUPWM) is attractive for modular multilevel converter (MMC) because of better output harmonic characteristics and fewer comparison units. However, there are also drawbacks to SUPWM that come to light. When the conventional SUPWM is employed in the MMC, the discontinuous switching action of the three-phase submodules will result in a large common-mode voltage on the AC side of the MMC. The common-mode voltage can produce serious electromagnetic interference. In addition, in the field of AC drive applications, the common-mode voltage can also damage the insulation of the motor windings and increase the mechanical wear of the bearings. Therefore, the common-mode voltage in SUPWM should not be neglected. To solve the problem, a phase-shifting control method is proposed. The proposed method can eliminate the common-mode voltage generated by SUPWM by changing the phase of the triangular carriers. The effectiveness of the proposed method is verified by Matlab/Simulink simulation. © 2023 IEEE.

关键词： pulse width modulation

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Voltage Unbalance Compensation of Flying Capacitor Based on a Dynamic pulse width modulation Applied to a Flying Capacitor Leg Inverter 14th

Voltage Unbalance Compensation of Flying Capacitor Based on ...

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14th International conference of the IMACS TC1 Committee, ELECTRIMACS 2022

作者： Jday, Mariem Vidal, Paul-Etienne Laboratoire Génie de Production LGP Université de Toulouse INP-ENIT Tarbes CEDEX France

ISBN: (纸本)9783031248368

This paper introduces a dynamic pulse width modulation scheme, apply to N-level Flying Capacitor inverter. A mathematical approach is detailed to solve the expression of a linear system that model the inverter leg considered. Some degrees of freedom, that have to be set, are exhibited. The proposed technique relies on the relationship made between the degrees of freedom and the voltage unbalance of the floating capacitors. Simulation results are provided to illustrate the performance of such a modulation scheme. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： pulse width modulation

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