• 제목/요약/키워드: Leakage inductance

검색결과 242건 처리시간 0.04초

다중권선 변압기를 이용한 능동형 셀 밸런싱 회로의 에너지 전달 효율을 높이기 위한 향상된 스위칭 패턴 (Enhanced Switching Pattern to Improve Energy Transfer Efficiency of Active Cell Balancing Circuits Using Multi-winding Transformer)

  • 이상중;김명호;백주원;정지훈
    • 전력전자학회논문지
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    • 제24권4호
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    • pp.279-285
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    • 2019
  • This study proposes an enhanced switching pattern that can improve energy transfer efficiency in an active cell-balancing circuit using a multiwinding transformer. This balancing circuit performs cell balancing by transferring energy stored in a specific cell with high energy to another cell containing low energy through a multiwinding transformer. The circuit operates in flyback and buck-boost modes in accordance with the energy transfer path. In the conventional flyback mode, the leakage inductance of the transformer and the stray inductance component of winding can transfer energy to an undesired path during the balancing operation. This case results in cell imbalance during the cell-balancing process, which reduces the energy transfer efficiency. An enhanced switching pattern that can effectively perform cell balancing by minimizing the amount of energy transferred to the nontarget cells due to the leakage inductance components in the flyback mode is proposed. Energy transfer efficiency and balancing speed can be significantly improved using the proposed switching pattern compared with that using the conventional switching pattern. The performance improvements are verified by experiments using a 1 W prototype cell-balancing circuit.

분수슬롯을 가지는 축방향 자속형 영구자석 동기전동기의 코깅토크 및 전압리플 저감에 관한 연구 (Development of Fractional Slot Axial Flux Permanent Magnet Synchronous Generator with Low Cogging Torque and Reduced Voltage Regulation)

  • 최다운;이건;조윤현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.1111-1112
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    • 2011
  • This paper investigated application of fractional-slot concentrated-winding axial flux permanent magnet machines for wind turbines. Design criteria of cogging torque and voltage regulation was firstly proposed for this kind of application. Fractional winding has small cogging torque which is highlight for wind turbines, but slot leakage inductance would increase voltage regulation, which is an important performance index of generators. By varying slot opening, cogging torque and slot leakage inductance could be adjusted. In this paper, cogging torque and inductances were calculated by both analytical and finite element methods. Voltage regulation was studied by two-axis model under unity-power-factor load and verified by transient finite element analysis.

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토로이달 타입 변압기 권선의 Interleaving 효과 분석 (Analysis of Interleaving Effect for Toroidal Type Transformer Windings)

  • 신경구;강병극;정세교
    • 전력전자학회논문지
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    • 제20권3호
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    • pp.255-261
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    • 2015
  • An analysis of the interleaving effect for the secondary winding distribution of a toroidal transformer is presented in this paper. The equations to calculate the leakage inductance of the toroidal transformer are derived using MMF diagrams for the different secondary winding distributions. The simulation and experimental results are provided to show the validity of the theoretical calculation.

다(多)출력 DC-DC 플라이백 컨버터용 변압기 설계방법 및 개발 (The Design and Development of Flyback Transformer for Multi - Out Flyback DC-DC Converter)

  • 박종연;강도형
    • 산업기술연구
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    • 제20권B호
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    • pp.163-168
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    • 2000
  • This paper gives a fundamental study of the design method of Flyback Transformer(FBT) in the Multioutput Flyback DC-DC Converter. We explained a winding strategy and Core selecting of the Flyback transformer to get the design guidelines for optimizing the performance of Flyback DC-DC Converter. The final goal of this paper is to obtain design rules of the Flyback transformer to minimize the leakage inductance for good quality of DC Souce.

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Analysis, Design, and Implementation of a Soft-Switched Active-Clamped Forward Converter with a Current-Doubler Rectifier

  • Jang, Paul;Kim, Hye-Jin;Cho, Bo-Hyung
    • Journal of Power Electronics
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    • 제16권3호
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    • pp.894-904
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    • 2016
  • This study examines the zero-voltage switching (ZVS) operation of an active-clamped forward converter (ACFC) with a current-doubler rectifier (CDR). The ZVS condition can be obtained with a much smaller leakage inductance compared to that of a conventional ACFC. Due to the significantly reduced leakage inductance, the design is optimized and the circulating loss is reduced. The operation of the ACFC with a CDR is analyzed, and a detailed ZVS analysis is conducted on the basis of a steady-state analysis. From the results, a design consideration for ZVS improvement is presented. Loss analyses of the converters shows that enhanced soft-switching contributes to an efficiency improvement under light-load condition. Experimental results from a 100-W (5-V/20-A) prototype verify that the ACFC with a CDR can attain ZVS across an extended load range of loads and achieve a higher efficiency than conventional ACFCs.

다중 출력 LLC 직렬 공진 컨버터의 이득 특성 연구 (A Study on the Gain Characteristics of Multi-output LLC Series Resonant Converter)

  • 이재삼;박준호;허동영;강성인;김주훈;김은수
    • 전력전자학회논문지
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    • 제14권3호
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    • pp.177-187
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    • 2009
  • 본 논문에서는 다중 출력을 갖는 LLC 직렬 공진 컨버터의 입출력 이득에 대한 새로운 해석법을 제시한다. 특히 Math-CAD 시뮬레이션을 통해 변압기 2차 측 누설인덕턴스 성분에 의한 주파수 이득특성 변화를 분석한다. 유도된 수식 이론을 근거로, 3개의 출력을 갖는 430W급 공진 컨버터를 제작하여 46인치용 PDP 파워모듈의 Sustain 블록에 적용함으로서, 제안된 해석법의 정확성을 검증한다.

고전압 Cascaded NPC H-Bridge 인버터 설계 (Design of High Voltage Cascaded NPC H-Bridge Inverter)

  • 현승욱;노용수;현병조;최준혁;김진홍
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2018년도 전력전자학술대회
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    • pp.290-291
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    • 2018
  • This paper proposed design method of DC link capasitor and leakage inductance of transformer with high voltage cascaded NPC H-bridge inverter. DC link capacitor is designed based on the ripple power between input AC power and output AC power, and leakage inductance of transformer is designed based on FFT table of unipola PWM with NPC H-bridge inverter. The proposed design method is verified by simulation results of 6.6[kV], 1.2[MW] Cascaded NPC H-bridge inverter.

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고효율 LLC 직렬공진 컨버터 (A High Efficiency LLC Series Resonant Converter)

  • 강성인;윤광호;김은수;박준호;임대호
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2007년도 하계학술대회 논문집
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    • pp.424-427
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    • 2007
  • The LLC series resonant converter with a LLT (Inductor-Inductor-Transformer) transformer for PDP power supply is presented. LLT transformer used to combine the inductor and transformer into one unit has the increased leakage inductance in the primary and secondary due to the winding method and the use of the gaped core. The increased leakage inductance in the primary and secondary of LLT transformer can be impacted on the DC voltage gain characteristics of LLC series resonant converter. In this paper, DC gain characteristics and the experimental results of the LLC series resonant converter with a LLT transformer are verified on the Math-CAD simulation based on the theoretical analysis and the 600W experimental prototype.

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두 개의 인덕터를 갖는 PV-MIC용 준공진 부스트 컨버터 (Quasi-resonant Two-Inductor boost converter for PV-MIC)

  • 박승원;김재형;김준구;류동균;김태훈;원충연
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2010년도 추계학술대회
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    • pp.188-189
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    • 2010
  • This paper proposed a new zero-voltage switching(ZVS) Two-Inductor boost converter. The conventional Two-Inductor boost converter has defect. When the switch is turned off, the high voltage spike is occurred in the switch by leakage inductance and switch parasitic capacitor. To solve this problem, the parallel resonant capacitor is added to the conventional Two-Inductor boost converter. Using quasi-resonant between parallel resonant capacitance and leakage inductance, the switches is operated soft switching. A reduction of transformer turn ratio is achieved by the voltage doubler rectifier.

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넓은 입력 전압 범위를 갖는 20kW급 양방향 3상 푸쉬풀 컨버터 (A 22kW Bidirectional Three-Phase Push-Pull Converter for Wide Voltage Range Application)

  • 레덧탕;정현주;김선주;최세완
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2019년도 전력전자학술대회
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    • pp.8-10
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    • 2019
  • In this paper, a bidirectional three-phase push pull converter is analyzed for the high power, wide voltage range applications. From comparison analysis of two switching methods: PWM plus phase-shift (PPS) and dual-asymmetric PWM (DAPWM) with the effect of dead-time, the proposed hybrid control is aimed to reduce the circulating current under wide voltage range operation. Value of leakage inductance effect to the peak current value, current stress and conduction loss in facing the load variation. Trade-off between power range and slew rate of transformer current was analyzed for properly selecting value of the transformer leakage inductance. Experimental results from a 22-kW prototype are provided to validate the proposed concept.

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