• 제목/요약/키워드: High Power density

검색결과 2,171건 처리시간 0.031초

고효율, 고전력밀도 아답터를 위한 도통밴드 제어 AC-DC 벅 컨버터 (A Conduction Band Control AC-DC Buck Converter for a High Efficiency and High Power Density Adapter)

  • 문상철;정봉근;구관본
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2017년도 전력전자학술대회
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    • pp.38-39
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    • 2017
  • This paper proposes a new control method for an AC-DC Buck converter which is utilized as a front-end converter of a 2-stage high power density adapter. In the conventional adapter applications, 2-stage configuration shows higher power transfer efficiency and higher power density than those of the single stage flyback converter. In the 2-stage AC-DC converter, the boost converter is widely used as a front-end converter. However, an efficiency variation between high AC line and low AC line is large. On the other hand, the proposed conduction band control method for a buck front-end converter has an advantage of small efficiency variation. In the proposed control method, switching operation is determined by a band control voltage which represents output load condition, and an AC line voltage. If the output load increasesin low AC line, the switching operation range is expanded in half of line cycle. On the contrary, in light load and high line condition, the switching operation is narrowed. Thus, the proposed control method reduces switching loss under high AC line and light load condition. A 60W prototype which is configured the buck and LLC converter with the proposed control method is experimented on to verify the validity of the proposed system. The prototype shows 92.16% of AC-DC overall efficiency and 20.19 W/in 3 of power density.

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A Hybrid Energy Storage System Using a Superconducting Magnet and a Secondary Battery

  • ISE Toshifumi;YOSHIDA Takeshi;KUMAGAI Sadatoshi
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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    • pp.534-538
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    • 2001
  • Energy storage devices with high energy density as well as high power density are expected to be developed from the point of view of compensation of fluctuating load and generated power by distributed generations such as wind turbines, photovoltaic cells and so on. SMES (Superconducting Magnetic Energy Storage) has higher power density than other energy storage methods, and secondary batteries have higher energy density than SMES. The hybrid energy storage device using SMES and secondary batteries is proposed as the energy storage method with higher power and energy density, the sharing method of power reference value for each storage device, simulation and experimental results are presented.

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최적 전류파형제어를 통한 브러시리스 DC 발전기의 출력밀도 최대화에 관한 연구 (Power Density Maximization of the Brushless DC Generator by Controlling the Optimal Current Waveform)

  • 이형우
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제53권7호
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    • pp.430-436
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    • 2004
  • This paper presents an advanced control technique for power density maximization of the Brushless DC (BLDC) generator by using the linear tracking method. In a generator of given rating, the weight and size of the system affect the fuel consumption directly. Therefore, power density is one of the most important issues in a stand-alone generator. BLDC generator has high power density in the machine point of view and additional increases of power density by control means can be expected. Conventional rectification methods cannot achieve the maximum power possible because of hon-optimal current waveforms. The optimal current waveform to maximize power density and minimize machine size and weight in a nonsinusoidal power supply system has been derived, incorporated in a control system, and verified by simulation and experimental work. A new simple algebraic method has been proposed to accomplish the proposed control without an FFT which is time consuming and complicated.

영구자석 고속전동기의 출력밀도 및 효율 향상을 위한 설계 기법 (Design Technique of a Permanent Magnet High-speed Motor for Improving Power Density and Efficiency)

  • 이기덕;이주;이형우
    • 전기학회논문지
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    • 제63권3호
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    • pp.425-430
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    • 2014
  • This paper presents a design technique to improve the power density and efficiency of a permanent magnet high-speed motor by using the mono-PM rotor. The suggested model minimized rotor diameter and stack length which have a bad influence on shafting in the high-speed operation. Conventional and suggested motors are analyzed and compared by using FEM(Finite Element Method) to verify the effectiveness. The overall performance such as torque, losses, efficiency and power density and so on are investigated in detail. The results of the analysis deduced that the suggested mono-PM rotor design is superior to the conventional one.

IPM 모터의 출력밀도 향상에 관한 연구 (A Study on the Improvement of Power Density for IPMSM)

  • 진창성
    • 전기학회논문지
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    • 제64권5호
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    • pp.701-707
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    • 2015
  • Recently, it has to design the motor to raise power density because of many necessary application, such as home appliances and hybrid electric vehicles. Power of motor is made up of the torque and speed. So, if the motor which is the same size and shape is designed to raise speed, power and power density are increase.

상온 분사 공정을 이용하여 제조한 고에너지 밀도 세라믹 유전체 커패시터 (High Energy Density Dielectric Ceramics Capacitors by Aerosol Deposition)

  • 송현석;이건;예지원;정지윤;정대용;류정호
    • 한국전기전자재료학회논문지
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    • 제37권2호
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    • pp.119-132
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    • 2024
  • Dielectric ceramic capacitors present high output power density due to the fast energy charge and discharge nature of dielectric polarization. By forming dense ceramic films with nano-grains through the Aerosol Deposition (AD) process, dielectric ceramic capacitors can have high dielectric breakdown strength, high energy storage density, and leading to high power density. Dielectric capacitors fabricated by AD process are expected to meet the increasing demand in applications that require not only high energy density but also high power output in a short time. This article reviews the recent progress on the dielectric ceramic capacitors with improved energy storage properties through AD process, including energy storage capacitors based on both leadbased and lead-free dielectric ceramics.

고효율 및 고전력밀도 3-레벨 LLC 공진형 컨버터 (High-Efficiency and High-Power-Density 3-Level LLC Resonant Converter)

  • 구현수;김효훈;한상규
    • 전력전자학회논문지
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    • 제23권3호
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    • pp.153-160
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    • 2018
  • Recent trends in high-power-density applications have highlighted the importance of designing power converters with high-frequency operation. However, conventional LLC resonant converters present limitations in terms of high-frequency driving due to switching losses during the turn-off period. Switching losses are caused by the overlap of the voltage and current during this period, and can be decreased by reducing the switch voltage. In turn, the switch voltage can be reduced through a series connection of four switches, and additional circuitry is essential for balancing the voltage of each switch. In this work, a three-level LLC resonant converter that can operate at high frequency is proposed by reducing switch losses and balancing the voltages of all switches with only one capacitor. The voltage-balancing principle of the proposed circuit can be extended to n-level converters, which further reduces the switch voltage stress. As a result, the proposed circuit is applicable to high-input applications. To confirm the validity of the proposed circuit, theoretical analysis and experimental verification results from a 350 W-rated prototype are presented.

High-Power-Density Power Conversion Systems for HVDC-Connected Offshore Wind Farms

  • Parastar, Amir;Seok, Jul-Ki
    • Journal of Power Electronics
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    • 제13권5호
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    • pp.737-745
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    • 2013
  • Offshore wind farms are rapidly growing owing to their comparatively more stable wind conditions than onshore and land-based wind farms. The power capacity of offshore wind turbines has been increased to 5MW in order to capture a larger amount of wind energy, which results in an increase of each component's size. Furthermore, the weight of the marine turbine components installed in the nacelle directly influences the total mechanical design, as well as the operation and maintenance (O&M) costs. A reduction in the weight of the nacelle allows for cost-effective tower and foundation structures. On the other hand, longer transmission distances from an offshore wind turbine to the load leads to higher energy losses. In this regard, DC transmission is more useful than AC transmission in terms of efficiency because no reactive power is generated/consumed by DC transmission cables. This paper describes some of the challenges and difficulties faced in designing high-power-density power conversion systems (HPDPCSs) for offshore wind turbines. A new approach for high gain/high voltage systems is introduced using transformerless power conversion technologies. Finally, the proposed converter is evaluated in terms of step-up conversion ratio, device number, modulation, and costs.

고전력밀도 AC/DC Adapter를 위한 off-time 제어법 (Off-time Control Method for High Power Density AC/DC Adapter)

  • 강신호;장준호;홍성수;이준영
    • 전력전자학회논문지
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    • 제12권6호
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    • pp.510-516
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    • 2007
  • 본 논문에서는 더 높은 에너지 효율을 요구하는 전자 기기들의 사용에 따른 고전력 밀도 AC/DC adapter를 위한 향상된 제어 방법을 제안한다. PFC (Power Factor Correction) 토폴로지는 BCM (Boundary Conduction Mode)제어 방식을 적용한 부스트 토폴로지를 기본으로 하였으며, DC/DC 토폴로지는 50% 고정 duty법과 함께 새롭게 제안된 Off-time 제어법을 적용한 하프브릿지 토폴로지를 기본으로 하였다. 이는 반도체 소자와 마그네틱 소자의 크기를 줄이는데 용이하다. 85W급 AC/DC 어뎁터(18.5V/4.6A)를 설계하여 실험한 결과 90%의 효율과 $36W/in^3$의 전력밀도가 측정되었고 무부하시 전력 손실은 0.5W를 달성하였다.

고전력밀도 AC/DC 어댑터의 설계 (Design of High Power Density AC/DC Adapter)

  • 이준영
    • 전력전자학회논문지
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    • 제15권4호
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    • pp.259-265
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    • 2010
  • 본 논문에서는 더 높은 에너지 효율을 요구하는 전자 기기들의 사용에 따른 고전력 밀도 AC/DC 어댑터의 구조를 제안한다. PFC (Power Factor Corrector) topology는 BCM (Boundary Conduction Mode)제어 방식을 적용한 Boost topology를 기본으로 하였으며, DC/DC topology는 주파수제어를 적용한 LLC 공진 컨버터를기본으로 하였다. 이는 반도체 소자 및 마그네틱 소자의 크기를 줄이는데 용이하다. 85W급 AC/DC adapter (18.5V/4.6A)를 설계하여 실험한 결과 $90V_{rms}$의 입력전압에서 90%의 효율과 $36W/in^3$의 전력밀도가 측정되었고 무부하시 전력 손실은 0.5W를 달성하였다.