Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351871
Eun-Soo Kim, Sun-Ho Choi, M. Kye
In this paper, an improved active-clamp forward converter with a lossless snubber composed of a tapped inductor, a snubber capacitor and two diodes is proposed. By adding the lossless snubber at the secondary side of the active clamp forward converter, better ZVS operation, higher efficiency and lower ripple noise of the output voltage are achieved. The operational principles and the equivalent mode analysis of the proposed topology are described. A 300W (50V 6A) prototype is designed, tested, and compared to the conventional active clamp forward converter.
{"title":"An improved active-clamp ZVS forward converter with a lossless snubber","authors":"Eun-Soo Kim, Sun-Ho Choi, M. Kye","doi":"10.1109/INTLEC.2009.5351871","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351871","url":null,"abstract":"In this paper, an improved active-clamp forward converter with a lossless snubber composed of a tapped inductor, a snubber capacitor and two diodes is proposed. By adding the lossless snubber at the secondary side of the active clamp forward converter, better ZVS operation, higher efficiency and lower ripple noise of the output voltage are achieved. The operational principles and the equivalent mode analysis of the proposed topology are described. A 300W (50V 6A) prototype is designed, tested, and compared to the conventional active clamp forward converter.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124523566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351810
R. Simanjorang, H. Yamaguchi, H. Ohashi, T. Takeda, H. Murai, M. Yamasaki
In this paper, the performance of high output power density 400/400V isolated dc/dc converter for power supply in data center is investigated. The isolated dc/dc converter uses the hybrid pair of SJ-MOSFET and SiC-SBD power devices. A high accuracy of dc/dc converter analysis is carried out by considering the intrinsic and extrinsic loss parameter of power devices and circuit board. Based on this analysis, the efficiency and power density of isolated DC/DC converter is estimated for various high switching frequencies (100 kHz, 200 kHz and 300 kHz). From the result of the analysis operation of switching frequency by 200 kHz results in the highest output power density among the various high switching frequencies. The analysis estimates that the isolated dc/dc converter with efficiency around 97% and power density 10 W/cm3 has strong possibility to be realized by the proposed design.
{"title":"Estimating performance of high output power density 400/400V isolated DC/DC converter with hybrid pair SJ-MOSFET and SiC-SBD for power supply of data center","authors":"R. Simanjorang, H. Yamaguchi, H. Ohashi, T. Takeda, H. Murai, M. Yamasaki","doi":"10.1109/INTLEC.2009.5351810","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351810","url":null,"abstract":"In this paper, the performance of high output power density 400/400V isolated dc/dc converter for power supply in data center is investigated. The isolated dc/dc converter uses the hybrid pair of SJ-MOSFET and SiC-SBD power devices. A high accuracy of dc/dc converter analysis is carried out by considering the intrinsic and extrinsic loss parameter of power devices and circuit board. Based on this analysis, the efficiency and power density of isolated DC/DC converter is estimated for various high switching frequencies (100 kHz, 200 kHz and 300 kHz). From the result of the analysis operation of switching frequency by 200 kHz results in the highest output power density among the various high switching frequencies. The analysis estimates that the isolated dc/dc converter with efficiency around 97% and power density 10 W/cm3 has strong possibility to be realized by the proposed design.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126548043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351767
A. Matsumoto, A. Fukui, T. Takeda, K. Hirose, M. Yamasaki
We outline the specifications and performance of a 400 Vdc power distribution system with a 400 Vdc output rectifier. In 2008, The NTT-group have began developing a 400 Vdc distribution system for reducing power consumption and the usage of materials, such as copper in power cables [1]. In conjunction with this project, NTT Facilities has developed prototype rectifiers, a prototype voltage compensator used during interruption periods, and a prototype battery charger. These exhibit higher efficiency than conventional ones and also exhibit high output regulation to adapt charge condition required by valve-regulated lead acid batteries for backup.
{"title":"Development of 400 Vdc power distribution system and 400 Vdc output rectifier","authors":"A. Matsumoto, A. Fukui, T. Takeda, K. Hirose, M. Yamasaki","doi":"10.1109/INTLEC.2009.5351767","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351767","url":null,"abstract":"We outline the specifications and performance of a 400 Vdc power distribution system with a 400 Vdc output rectifier. In 2008, The NTT-group have began developing a 400 Vdc distribution system for reducing power consumption and the usage of materials, such as copper in power cables [1]. In conjunction with this project, NTT Facilities has developed prototype rectifiers, a prototype voltage compensator used during interruption periods, and a prototype battery charger. These exhibit higher efficiency than conventional ones and also exhibit high output regulation to adapt charge condition required by valve-regulated lead acid batteries for backup.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128163823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351988
K. Matsui, M. Hasegawa, K. Ando
EDLCs (Electric Double Layer Capacitors) offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilisation in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region of their critical voltage limit or capacity limit. In order to apply them efficiently, the devices should be use with balanced voltage. Firstly, the authors discuss a conventional method, using a forward converter. Under such background on superior technologies. In a second approach, a novel voltage balancer is presented, employing a CW(Cockcroft-Walton) circuit. Characteristics of proposed circuit are analized and discussed.
{"title":"Further development on voltage balancer for EDLCs employing cockcroft-walton circuit","authors":"K. Matsui, M. Hasegawa, K. Ando","doi":"10.1109/INTLEC.2009.5351988","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351988","url":null,"abstract":"EDLCs (Electric Double Layer Capacitors) offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilisation in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region of their critical voltage limit or capacity limit. In order to apply them efficiently, the devices should be use with balanced voltage. Firstly, the authors discuss a conventional method, using a forward converter. Under such background on superior technologies. In a second approach, a novel voltage balancer is presented, employing a CW(Cockcroft-Walton) circuit. Characteristics of proposed circuit are analized and discussed.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121700909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351840
Minh‐Khai Nguyen, Young-Gook Jung, Y. Lim, Duk-Guen Cha
This paper proposes a novel single-phase quasi-Z-source AC/AC converter (qZSAC). Compared to traditional single-phase Z-source AC/AC converter, the proposed qZSAC has following features: the input voltage and output voltage is sharing the same ground; the operation is in continuous current mode (CCM). The proposed qZSAC can control to shape the input current to be sinusoidal and in phase with the input voltage. The operating principles, simulation results are presented. To verify these described performance features, PSIM simulation and experimental results were performed with a low total harmonic distortion of input current and high input power factor.
{"title":"Single-phase quasi-Z-source AC/AC converter","authors":"Minh‐Khai Nguyen, Young-Gook Jung, Y. Lim, Duk-Guen Cha","doi":"10.1109/INTLEC.2009.5351840","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351840","url":null,"abstract":"This paper proposes a novel single-phase quasi-Z-source AC/AC converter (qZSAC). Compared to traditional single-phase Z-source AC/AC converter, the proposed qZSAC has following features: the input voltage and output voltage is sharing the same ground; the operation is in continuous current mode (CCM). The proposed qZSAC can control to shape the input current to be sinusoidal and in phase with the input voltage. The operating principles, simulation results are presented. To verify these described performance features, PSIM simulation and experimental results were performed with a low total harmonic distortion of input current and high input power factor.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131788741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351902
Y. Oh, K. Ahn, Heejun Kim
This paper suggests a new method for oven detection in those induction heating rice cooker (IH-Jar) circuits that are controlled by DSP. The designed control method calculates oven detection levels based on changes in input currents during oven detection time and averages the input voltages, input currents and outputs during oven detection time thereby enhancing the reliability of oven detection. This new method allows more stable oven detection under the dip or distortion of commercial power supply that may occur in actual field, particularly, in circuits with no separate power factor circuit. The topology of the circuits used in this paper is Quasi-Resonant ZVS-PFM Single-ended.
{"title":"A new oven detection algorithm and control of IH-Jar achieved by DSP control","authors":"Y. Oh, K. Ahn, Heejun Kim","doi":"10.1109/INTLEC.2009.5351902","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351902","url":null,"abstract":"This paper suggests a new method for oven detection in those induction heating rice cooker (IH-Jar) circuits that are controlled by DSP. The designed control method calculates oven detection levels based on changes in input currents during oven detection time and averages the input voltages, input currents and outputs during oven detection time thereby enhancing the reliability of oven detection. This new method allows more stable oven detection under the dip or distortion of commercial power supply that may occur in actual field, particularly, in circuits with no separate power factor circuit. The topology of the circuits used in this paper is Quasi-Resonant ZVS-PFM Single-ended.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132768325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351864
Heesung Yoon, P. Shin, K. Fujiwara, C. Koh
In this paper, a novel finite element analysis taking account of two-dimensional magnetic properties of non-oriented electrical steel sheet is suggested and applied to performance analysis of a large-scale permanent magnet brushless DC motor. The magnetic properties of non-oriented silicon steel (50A1300) is measured by two-dimensional single sheet tester, and modeled by using extended B-H curve method for non-linear finite element analysis. Through the suggested finite element analysis, the performance such as iron loss and cogging torque is analyzed and compared with numerical results from conventional analysis method.
{"title":"Finite element analysis of a very large-scale permanent magnet BLDC motor considering two-dimensional magnetic properties of electrical steels","authors":"Heesung Yoon, P. Shin, K. Fujiwara, C. Koh","doi":"10.1109/INTLEC.2009.5351864","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351864","url":null,"abstract":"In this paper, a novel finite element analysis taking account of two-dimensional magnetic properties of non-oriented electrical steel sheet is suggested and applied to performance analysis of a large-scale permanent magnet brushless DC motor. The magnetic properties of non-oriented silicon steel (50A1300) is measured by two-dimensional single sheet tester, and modeled by using extended B-H curve method for non-linear finite element analysis. Through the suggested finite element analysis, the performance such as iron loss and cogging torque is analyzed and compared with numerical results from conventional analysis method.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114694781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351914
Y. Ishizuka, Fumitoshi Hirose, Yusuke Yamada, H. Matsuo
A proposed design of a low-cost digital pulse width modulation (DPWM) control circuit for non-isolated DC-DC converter without A/D converter is described. Also, propsed real-time PID control technique for DPWM is described. Some experimental results and simulation results are revealed the proposed circuit and scheme. The purpose of this research is striking a balance between minimizing cost increase by digitalizing of the control circuit of DC-DC converter and speeding up the control circuit.
{"title":"A time-delay suppression technique for DPWM control circuit","authors":"Y. Ishizuka, Fumitoshi Hirose, Yusuke Yamada, H. Matsuo","doi":"10.1109/INTLEC.2009.5351914","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351914","url":null,"abstract":"A proposed design of a low-cost digital pulse width modulation (DPWM) control circuit for non-isolated DC-DC converter without A/D converter is described. Also, propsed real-time PID control technique for DPWM is described. Some experimental results and simulation results are revealed the proposed circuit and scheme. The purpose of this research is striking a balance between minimizing cost increase by digitalizing of the control circuit of DC-DC converter and speeding up the control circuit.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121985624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351957
E. Joung, S. Oh, Sung-hyuk Park, Gildong Kim
The main part of the system is operated by the software. Besides the safety critical system such as railways, airplanes, and nuclear power plants is applied by the software. The software can perform more varying and highly complex functions efficiently because software can be flexibly designed and implemented. But the flexible design makes it difficult to predict the software failures. We need to show that the safety critical railway software is developed to ensure the safety. This paper is suggested safety criteria and software development methodology to enhance safety for the safety critical railway system.
{"title":"Safety criteria and development methodology for the safety critical railway software","authors":"E. Joung, S. Oh, Sung-hyuk Park, Gildong Kim","doi":"10.1109/INTLEC.2009.5351957","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351957","url":null,"abstract":"The main part of the system is operated by the software. Besides the safety critical system such as railways, airplanes, and nuclear power plants is applied by the software. The software can perform more varying and highly complex functions efficiently because software can be flexibly designed and implemented. But the flexible design makes it difficult to predict the software failures. We need to show that the safety critical railway software is developed to ensure the safety. This paper is suggested safety criteria and software development methodology to enhance safety for the safety critical railway system.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117060197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351765
Katsunaga Watanabe, M. Uesugi, M. Komatsu
The International Space Station (ISS) electric power system is now the world's largest dc power system in space. The analysis and design of electric stability, power quality, power management and protection for the ISS were critical issues and concerns from early design phase. Especially, the design evaluation and verification for the electric stability must be required to the all ISS modules in every design phase. Japan Aerospace Exploration Agency (JAXA) is responsible for the design and verification of Electric Power System (EPS) in Japanese Experiment Module (JEM). This paper describes the approach of the small signal stability analysis and verification showing JEM EPS simulator test data.
{"title":"Verification and analysis for small signal stability of Electric Power Systems for the international space station/JEM","authors":"Katsunaga Watanabe, M. Uesugi, M. Komatsu","doi":"10.1109/INTLEC.2009.5351765","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351765","url":null,"abstract":"The International Space Station (ISS) electric power system is now the world's largest dc power system in space. The analysis and design of electric stability, power quality, power management and protection for the ISS were critical issues and concerns from early design phase. Especially, the design evaluation and verification for the electric stability must be required to the all ISS modules in every design phase. Japan Aerospace Exploration Agency (JAXA) is responsible for the design and verification of Electric Power System (EPS) in Japanese Experiment Module (JEM). This paper describes the approach of the small signal stability analysis and verification showing JEM EPS simulator test data.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128310349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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