Development of High-Step-Up IsolatedDCDC Converter based on Super-High Frequency Switching to Physical Limit in Circuit Devices-Department of Electrical Engineering, Kobe City College of Technology Masataka Minami

Development of High-Step-Up IsolatedDCDC Converter based on Super-High Frequency Switching to Physical Limit in Circuit Devices-Department of Electrical Engineering, Kobe City College of Technology Masataka Minami

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Shibaura Institute of Technology doctoral degree thesis High frequency inverter for plasma generation equipment, and research on high frequency matching devices.-芝 浦 工 業 大 学 博 士 学 位 論 文 プラズマ生成装置の高周波インバータ、 および高周波整合器に関する研究 平成 29 年3 月

 

Shibaura Institute of Technology doctoral degree thesis High frequency inverter for plasma generation equipment, and research on high frequency matching devices. March 2017 

 芝 浦 工 業 大 学 博 士 学 位 論 文 プラズマ生成装置の高周波インバータ、 および高周波整合器に関する研究 平成 29 年3 月

Overview 

This paper is concerned with high-frequency plasma generation equipment for functional devices, semiconductor and liquid crystal manufacturing equipment, and aims to reduce power loss in high-frequency inverters, improve power conversion efficiency, and wide-range impedance matching of high-frequency matching boxes using high-frequency transformers. This is a summary of research results regarding. Thin film formation using high-frequency plasma, such as plasma chemical vapor deposition (Plasma CVD), is widely used in the production of semiconductors, liquid crystals, and solar cells. In recent years, the range of applications has expanded to include thin film coatings for industrial purposes. Furthermore, as a pretreatment for a physical vapor deposition (PVD) process, high-frequency plasma treatment using high-frequency waves is widely used to remove a natural oxide film (pre-clean). Conventionally, the mainstream of photoresist stripping treatments has been treatments that do not involve physical reactions, such as liquid etching treatment (wet etching) using acidic or alkaline solutions. In recent years, dry etching, which uses high-frequency plasma to etch materials with reactive gases, etching gases, ions, and radicals, has become mainstream in semiconductors, liquid crystals, and manufacturing equipment. High-frequency plasma technology is becoming increasingly important in the research and development of functional devices. Conventionally, high-frequency inverters with a frequency of 13.56 MHz and a high-frequency output of 1 kW, which are often used in semiconductor manufacturing equipment, have a low high-frequency power conversion efficiency of about 50%, and about 1 kW of power loss is converted into heat. To dissipate 1 kW of heat, a water-cooled heat exchanger and auxiliary equipment were required, which required 200 liters of cooling water per hour. There were also problems from the environmental standpoint of cooling water and ancillary equipment, energy consumption, and economics. In this study, we focused on high-frequency output transformers with the aim of reducing high-frequency power loss and improving power conversion efficiency. Conventionally, a high-frequency output of 1 kW was obtained using four output transformers, but in this research, we investigated a high-efficiency, high-frequency output transformer, and a circuit configuration that achieves a high-frequency output of 1 kW. By using a single high-frequency inverter with a high-frequency output of 1 kW, it is possible to The high frequency output synthesizer used in the frequency inverter is no longer required. Therefore, we investigated ways to reduce power loss in high-frequency output combiners. To create a single high-frequency output transformer, four MOS-FETs must be connected in parallel. We investigated a push-pull type high-frequency inverter with four MOS-FETs connected in parallel using an axial printed circuit board (PCB). We also investigated power loss and temperature at high frequencies in high-frequency output transformers and high-frequency output combiners, which are important in realizing high-efficiency, high-frequency inverters. Furthermore, we evaluated and investigated the power loss and temperature at high frequencies of the high frequency ferrite core that constitutes the high frequency output transformer. Conventionally, in an ICP dry etching system using an L-type high-frequency matching box used in inductively coupled plasma (ICP), the chamber pressure used for high-frequency plasma generation is a low pressure of about 0.1 to 13 Pa, and a pressure of 1011 cm-3 or more is used for generating high-frequency plasma. High density plasma can be obtained. ICP high-frequency plasma is currently the mainstream etching method in semiconductor etching processes because high-density plasma can be obtained without using an electromagnetic coil. In the production of functional devices, photocurable resin (photoresist) is used.

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磁気結合インダクタを応用した 高電力密度コンバータの実現へ向けた研究 A Study on Realization of High Power Density Converters using Coupled Inductors-Shimane University Graduate School Graduate School of Integrated Science and Engineering Interdisciplinary Graduate School of Science and Engineering, Shimane University

 磁気結合インダクタを応用した 高電力密度コンバータの実現へ向けた研究 A Study on Realization of High Power Density Converters using Coupled Inductors 木村 翔太 島根大学大学院 総合理工学研究科 

Interdisciplinary Graduate School of Science and Engineering, Shimane University 2018年 3月

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Design method of current resonant converter October 31, 2014 Sanken Electric Co., Ltd. Technical Headquarters Chief Engineer Masashi Ochiai-電流共振形コンバータの設計法 2014年10月31日 サンケン電気(株) 技術本部 技師長 落合政司

 

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Research on performance improvement and industrial application of static electromagnetic equipment using iron-based amorphous alloys-Doctoral Dissertation (Thesis(doctor)----Tohoku University-2019-JAPAN

 

Research on performance improvement and industrial application of static electromagnetic equipment using iron-based amorphous alloys-Doctoral Dissertation (Thesis(doctor)----Tohoku University-2019-JAPAN

ABSTRACT：Iron-based amorphous alloy has the advantages of lower iron loss and higher permeability compared with conventional grain-oriented silicon steel due to disappearance of magnetocrystalline anisotropy derived from randomly aligned magnetic atoms. One can expect for considerable improvementinpower efficiency of presently commercialized staticelectromagnetic machinessuch as distribution transformer and filtering reactor for inverter system by replacing the core material from silicon steel to iron-based amorphous alloy. Moreover, the material’s satisfactory performance at higher frequency enables application to the fieldof next generationin power distribution system. However, the commercially available iron-based amorphous alloy produced with meltquenching method has a shape of 20 to 30 m-thick thin foil; the coremade from the stacked and wound several hundred to thousand foils isfragile. This form of amorphous core causes difficulty in mass-production of the low cost and larger power capacity electromagnetic machines. Consequently, the range of industryapplication of amorphous alloy has been limited at present. Hence, this study aims at contribution to the savings of energy and CO2emission by theproposalsof low cost structures and design methodologies of three typesof amorphous electromagnetic machinethoseenable extensions of power capacity and excitation frequency. Additionally,the effect of improvement inpower efficiencies of them isdemonstrated by way of prototype tests. This thesis consists of six chapters;the research results are shown in accordance with the following organization. The chapter 1 describes the background and the objective of this study. The chapter 2 describes conventional technology and problems of amorphous electromagnetic machines. First, the advantages and disadvantages of presently mass-produced iron-based amorphous alloy were organizedcomparing the magnetic and physical properties of it with those of conventional grain-oriented silicon steel. Then, this chapter reviewed production methods of presently commercialized amorphous electromagnetic machinesandclarified the problems to be solved for extension of range of industryapplication. The chapter 3 describes the development of larger capacity distribution transformer with amorphous wound cores as the first case. This study considered a 30 MVA classed three phase amorphous core transformer that was not implementedup to nowbecause of structural problems, and proposed a structure that supports the fragile core while suppressing increase of iron loss. In advance of design, an estimation method of iron loss taking thecompressive stressin the core into account was established, which enabled the quantification of relationship between support method of larger wound core and its iron loss. The cores were divided into inner and outer components suspended independently; thedesign buffered the compressive stress affected in the cores and reduced the iron loss by 32% compared with that with a conventional support structure. In addition, providing the shielding components where the leakage field is concentrated resulted in 66% decrease in strayloss by utilizing the electromagnetic analysis. Then, a proposed support structure including 10 MVA single phase three legs amorphous core and windings were manufactured separately, and loss performancesof them were evaluated. This study determined totalloss at a load factor of 50% using measured values of iron loss and copper loss and analytical values of stray loss assuming an averaged load operating condition of transformer; as a result, the totalloss in a 30 MVA three phase amorphous core transformer could be reduced by 35% against a conventional silicon steel core transformer of same power capacity. The chapter 4 describes the development of amorphous core reactor for filtering component in uninterruptible power system (UPS) as the second case. This study invented two types of core structure for low cost and larger capacity three phase AC reactors formed from the toroidally wound amorphous yoke cores and the magnetic leg cores cut from solidified toroidal amorphous cores. Calculation models of iron loss in the cores and gap loss induced from the fringing flux between core components were established on the basis of a technique for extracting the coordinate components of the magnetic flux density in accordance with the anisotropic magnetization curvesin plane and laminated directionsof the amorphous foils. It was confirmed that the calculated iron losses at utility and carrier frequencies agree with measured losses within a 10% error. The prototyped amorphous reactors had approximately half the total losses of that of a conventional silicon steel core reactor and increased the power efficiency of the 400 kVA UPS by up to 0.55%. Furthermore, this study demonstrated the practicalityof aminiaturized amorphous reactor designed with a magnetic flux density of 1.2 T increased from standard oneof 0.8 T. It was verified that total loss and unit volume of the prototyped miniaturized reactor could be reduced by 35% and 43% respectivelycompared with those of a silicon steel core reactor. The chapter 5 describes the development of high frequency amorphous transformer for isolated DC-DC converter in DC-interconnected offshore wind farm system as the third case. This study designed and prototyped a core-type 3 kHz-excited 500 kVA transformer consisting of a single phase lap-joint amorphous wound core and windings with primary and secondary copper (Cu)sheets wound alternately in turns. The alternately wound winding structure suppressed the proximity effect between Cu sheets and the in-plane eddy current due to the fringing flux crossing the edge of sheets and fixtures, and the copper loss at 3 kHz was 61% lower than that of conventionally designed winding with primary and secondary sheets wound continuously. The rated total loss of the transformer with alternately wound windings was 21% lower than that of a conventional one. Furthermore, this study proposed a guideline for iron loss-reducing design of the lap-joint part in the amorphous core based onthe measured iron loss at high frequencies and the results of electromagnetic analysis. The chapter 6 concludes the loss reduction effect of three types of amorphous electromagnetic machinedeveloped in this study and describes the remaining issues.

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