• Title/Summary/Keyword: Module Efficiency

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A Study on the Characteristics and Fabrication of Switching Power Module for High Efficiency and Small Size of Power Supply System (전원장치의 소형화와 고효율화를 위한 스위칭 파워 모듈의 제작과 특성에 관한 연구)

  • Kim, Chan;Jeon, Eui-Seok;Kang, Do-Young;Kim, Byung-Cheul
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.10a
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    • pp.758-761
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    • 2003
  • We have designed 5 V/500 mA transless type power module by using semiconductor switching technique, key technique for small size of power supply system. The power module is suitable to a small sized electronic system using a single power supply. It is composed of switching circuit using voltage drop type chopper method, control circuit, voltage detect circuit, and constant voltage circuit, and is fabricated to hybrid-IC type. The switching regulator power supply circuit, designed in this study, has satisfied the electrical characteristics of 5 V/500 mA transless type power module.

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Implementation of MINI-PACS using the DICOM Converter on the Web (DICOM Converter를 이용한 웹상에서의 MINI-PACS 구현)

  • Ji, Youn-Sang
    • Journal of radiological science and technology
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    • v.23 no.1
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    • pp.103-111
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    • 2000
  • In recent years, medical procedures have become more complex, while financial pressures for shortened hospital stays and increased efficiency in patient care have increased. As a result, several shortcomings of present film-based systems for managing medical images have become apparent. Maintaining film space is labor intensive and consumes valuable space. Because only single copies of radiological examinations exist, they are prone to being lost or misplaced, thereby consuming additional valuable time and expense. In this paper, MINI-PACS for image archiving, transmission, and viewing offers a solution to these problems. Proposed MINI-PACS consists of mainly four parts such as Web Module, Client-Server Module, Internal Module, Acquisition Module. In addition, MINI-PACS system includes DICOM Converter that Non-DICOM file format converts standard file format. In Client-Server Module case, Proposed system is combined both SCU(Service Class User: Client) part and SCP(Service Class Provider: Server)part therefore this system provides the high resolution image processing techniques based on windows platform. Because general PACS system is too expensive for Medium and Small hospitals to install and operate the full-PACS. Also, we constructed Web Module for database connection through the WWW.

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Development of Gear Stiffness Module for Multi-Body Dynamic Analysis on Gears (다물체 동역학 해석을 위한 기어 강성 모듈 개발)

  • Song, Jin-Seop;Lee, Geun-Ho;Park, Young-Jun;Bae, Dae-Sung;Lee, Chul-Ho
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.1
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    • pp.130-136
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    • 2012
  • Dynamic as well as static and geometric design parameters such as inertia, tooth profile, backlash and clearance can be directly considered via multi-body dynamic analysis along with contact analysis. However, it is time consuming to use finite elements for the consideration of the tooth flexibility in the multi-body dynamic analysis of gears. A computationally efficient procedure, so called, Gear Stiffness Module, is suggested to resolve this calculation time issue. The characteristics of gear tooth compliance are discussed and rotational stiffness element concept for the Gear Stiffness Module is presented. Transmission error analyses for a spur gear system are carried out to validate the reliability and efficiency of the module. Compared with the finite element model, the Gear Stiffness Module yields considerably similar results and takes only 3% of calculation time.

A study of small size battery charging characteristic by serial-parallel connected DSC module (단위 DSC셀의 직병렬 연결을 통한 소형 배터리 충전특성에 관한 연구)

  • Hong, Ji-Tae;Choi, Jin-Young;Seo, Hyun-Woong;Kim, Mi-Jeong;Sim, Ji-Young;Kim, Hee-Je
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.192-194
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    • 2006
  • To elucidate possible challenges for outdoor practical use of dye-sensitized solar cells(DSC), compared with conventional Si solar cells. DSC modules still need the larger area than conventional Si solar modules to attain the same rated output because of lower photoelectron-chemical conversion efficiency. However, using batteries backup systems, the measured data shows that DSCs gathered over 12% more electricity than Si solar cells of the same rated output power in same outdoor condition. Moreover, battery charging time of DSC is about 1 hour faster than same rate of Si solar module. In this paper, 12 single DSC cells prepared for 4 serialized DSC cells was connected in 3 row parallel which have same output power rate of Si solar module. This DSC module was practiced generating characteristic experiment over outdoor daylight condition and applied with PV battery charger by using DC-DC converter. The main advantages of DSC module battery charger as compared with conventional Si solar module one are shorter charge time and lower cost.

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A Buck-Boost Converter-Based Bipolar Pulse Generator

  • Elserougi, Ahmed A.;Massoud, Ahmed M.;Ahmed, Shehab
    • Journal of Power Electronics
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    • v.17 no.6
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    • pp.1422-1432
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    • 2017
  • This paper presents a buck-boost converter-based bipolar pulse generator, which is able to generate bipolar exponential pulses across a resistive load. The concept of the proposed approach depends on operating the involved buck-boost converters in discontinuous current conduction mode with high-voltage gain and enhanced efficiency. A full design of the pulse generator and its passive components is presented to ensure generating the pulses with the desired specifications (rise time, pulse width, and pulse magnitude) for a given load resistance and input dc voltage. In case of moderate pulsed output voltages (i.e. few of kV), one module of the presented bipolar generator can be employed. While in case of high-voltage pulsed output, multi-module version can be employed, where each module is fed from an isolated dc source and their outputs are connected in series. Simulation models for the proposed approach are built to elucidate their performance in case of one-module as well as multi-module based generator. Finally, a scaled-down prototype for one-module of buck-boost converter-based bipolar pulse generator is implemented to validate the proposed concept.

Design of a Highly Integrated Palette-type High Power Amplifier Module Using GaN Devices for DPD Application (질화갈륨 소자를 이용한 DPD용 고집적 팔렛트형 고출력증폭기 모듈 설계)

  • Oh, Seong-Min;Lim, Jong-Sik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.5
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    • pp.2241-2248
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    • 2011
  • This paper describes the design of a palette-type 60watt high power amplifier module using gallium nitride(GaN) devices with high power and efficiency performances for WiMAX and LTE systems. The line-up for the high gain amplifier module consists of the pre-amplifier stage with low power and high gain, 8watt GaN driving amplifier stage, and 60watt GaN high power amplifier stage of Doherty structure with two 30watt GaN devices. The obtained gain is 61.4dB with an excellent gain flatness of ${\pm}$0.075dB over 2.5~2.68GHz. GaN devices and the Doherty structure are adopted for the improvement of high efficiency and output power. The measurement for the fabricated high power amplifier module of palette type is performed using the widely known WiMAX signal all over the world. In the example of RRH(remote radio head) application of the fabricated amplifier module, the measured efficiency is 37~38% with the 10watts of modulated output power. It is shown that when the fabricated amplifier module is activated with a digital predistorter(DPD), the measured ACLR is better than 46dBc under the 10watts of modulated output power.

A Study on Development of Power Analysing Device for PV Module (태양전지 모듈의 발전량 분석 장치 개발에 관한 연구)

  • Moon, Chae-Joo;Kwak, Seung-Hun;Jang, Yeong-Hak;Kim, Tae-Gon;Kim, Eui-Sun;Kim, Tae-Hyun
    • Journal of the Korean Solar Energy Society
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    • v.30 no.6
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    • pp.73-80
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    • 2010
  • This study was conducted to estimate the relative performance of modules with changed characteristics due to long term exposure to the outdoor environment, with a specially made test device for simultaneous measurement of real time power output from the photovoltaic array, taking into account the inclined panel, direct irradiation, power being generated, temperature as well as the optimal analysis timing. In terminology description, M is an abbreviation of module and Group A, Group B are 10 modules series connection (1~10 of M), (11~20 of M) for each of them respectively. The overall mean voltage difference of M-18 with the lowest power output and M-14 with the highest output is-2.13V and it was identifiable that voltage difference was more concentrated to Group B. In addition, in case of M-2 and M-7, M-8, when compared with M-14, the overall mean voltage difference was -0.92V, -1.56 and -0.91V respectively showing the more concentration to Group A. When the temperature of module went up by $1^{\circ}C$, the mean voltage was reduced by 0.35V. For current, Group A was lower than Group B by-0.022A and the ratio of each group was 49.68% and 50.32% respectively, presumably the module with deteriorated properties were more concentrated to Group A relatively. From the comparison of relations with the comprehensive accumulation, M-2, M-7, M-8, M-16 and M-18 were those with deterioration of performance to the worst, thereby requiring precision examination. In comparative efficiency, M-14 was the most excellent one as 12.19% while M-18 as 10.53% was identified that its efficiency was comparatively rapidly reduced.

A High Efficiency Power Conversion Circuit with Wide ZVS Range for Large Screen PDP Sustaining Power Module (넓은 영전압 스위칭 범위를 갖는 대화면 PDP용 유지전원단을 위한 고효율 전력 변환회로)

  • Park Kyung-Hwa;Moon Gun-Woo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.6
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    • pp.578-586
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    • 2005
  • Recently, due to the launch of digital broadcasting service, the demand of Flat Panel Display (FPD) is sharply rising. Among them, the PDP is expected to be one of the most promising digital displays of next generation because of its large screen size, high resolution, thinness and board field of view. Meanwhile, the PDP uses ADS (Address Display-period Separation) scheme which divide one subfield into address and sustaining period to express the grey scale of images. Since the output of sustaining power module Is mostly used for sustaining period, the load of the sustaining power module can be considered as a pulsating load. Due to this particular load condition, if the wide ZVS range of the power switches is not guaranteed, the hard switching causes large amount of switching loss and serious thermal problem in power module. In this paper, a high efficiency power conversion circuit for 60' PDP sustaining power module which achieves wide ZVS range with the help of additional ZVS tank is proposed. According to the various gating methods, the different operations of the proposed converter are presented. And, to confirm the properties of the proposed converter, an experimental prototype of 900W power converter is constructed md tested. As a result, more than $92\%$ of high efficiency is obtained at $10\%$ load condition, and the ZVS operation is achieved from full load to $10\%$ load condition.

Temperature Control of BIPV system considering out air temperature (외기온도를 고려한 BIPV 시스템의 온도제어)

  • Baek, Jeong-Woo;Ko, Jae-Sun;Choi, Jung-Sik;Kang, Sung-Jun;Jang, Mi-Geum;Kim, Soon-Young;Chung, Dong-Hwa
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.10a
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    • pp.371-374
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    • 2009
  • This paper presents a cooling system using thermoelectron for improving the output of BIPV module. The temperature characteristic in regard to improving the output of BIPV system has rarely been studied up to now but some researchers only presented the method using a ventilator. The cooling system efficiency of BIPV module applied to a ventilator mainly depends on the weather such as wind, insolation etc. Because the cooling system of BIPV module using a ventilator is so sensitive, that is being set off by wind speed at all time but is unable to operate in the NOCT(Nominal Operating Cell Temperature) which is able to make the maximum output The paper presents the cooling system using thermoelectron so as to solve such problems. The temperature control of thermoelectron can be controlled independently in the outside environment because that is performed by micro-controller. The temperature control of thermoelectron, also, can be operated around NOCT through algorism of the temperature control. Therefore, outputs of the whole system increase and the efficiency rises. The paper demonstrates the validity of proposed method by comparing the data obtained through a experiment of the cooling method of BIPV using a ventilator and proposed thermoelectron.

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A Wireless Sink Congestion Control by Tournament Scheduling (토너먼트 스케줄링을 이용한 무선싱크 혼잡제어)

  • Lee, Chong-Deuk
    • Journal of Advanced Navigation Technology
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    • v.16 no.4
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    • pp.641-648
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    • 2012
  • The up-streams of the continuous streaming of data packets with lower importance level in the wireless sink node can cause congestion and delay, they affect on energy efficiency, memory size, buffer size, and throughput. This paper proposes a new wireless sink congestion control mechanism based on tournament scheduling. The proposed method consists of two module parts: stream decision module part and service differentiation module part. The final winner in the tournament controls congestion effectively, minimizes packet loss due to congestion, decreases energy consumption, and improves QoS. The simulation result shows that the proposed method is more effective and has better performance compared with those of congestion descriptor-based control method, reliability-based control method, and best-effort transmission control method.