• 제목/요약/키워드: High step-up converter

검색결과 189건 처리시간 0.028초

A New High Efficient Bi-directional DC/DC Converter in the Dual Voltage System

  • Lee Su-Won;Lee Seong-Ryong;Jeon Chil-Hwan
    • Journal of Electrical Engineering and Technology
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    • 제1권3호
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    • pp.343-350
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    • 2006
  • This paper introduces a new high efficient bi-directional, non-isolated DC/DC converter. Through variations of the topology of the conventional Cuk converter, an optimum bi-directional DC/DC converter is proposed. Voltage and current in the proposed DC/DC converter are continuous. Furthermore, the efficiency in both step-up and step-down mode is improved over that of the conventional bi-directional converter. To prove the validation for the proposed converter, simulations and experiments are executed with a 300W bi-directional converter.

Interleaved High Step-Up Boost Converter

  • Ma, Penghui;Liang, Wenjuan;Chen, Hao;Zhang, Yubo;Hu, Xuefeng
    • Journal of Power Electronics
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    • 제19권3호
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    • pp.665-675
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    • 2019
  • Renewable energy based on photovoltaic systems is beginning to play an important role to supply power to remote areas all over the world. Owing to the lower output voltage of photovoltaic arrays, high gain DC-DC converters with a high efficiency are required in practice. This paper presents a novel interleaved DC-DC boost converter with a high voltage gain, where the input terminal is interlaced in parallel and the output terminal is staggered in series (IPOSB). The IPOSB configuration can reduce input current ripples because two inductors are interlaced in parallel. The double output capacitors are charged in staggered parallel and discharged in series for the load. Therefore, IPOSB can attain a high step-up conversion and a lower output voltage ripple. In addtion, the output voltage can be automatically divided by two capacitors, without the need for extra sharing control methods. At the same time, the voltage stress of the power devices is lowered. The inrush current problem of capacitors is restrained by the inductor when compared with high gain converters with a switching-capacitor structure. The working principle and steady-state characteristics of the converter are analyzed in detail. The correctness of the theoretical analysis is verified by experimental results.

낮은 변압기 턴비를 갖는 고승압.대전력용 3상 ZVS DC-DC컨버터 (Three-Phase ZVS DC-DC Converter with Low Transformer Turn Ratio for High Step-up and High Power Applications)

  • 김준근;박찬수;최세완;박가우
    • 전력전자학회논문지
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    • 제16권3호
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    • pp.242-249
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    • 2011
  • 제안하는 컨버터는 부스트 하프브리지-전압 더블러를 각각 병렬-직렬로 연결하여 출력전력 및 출력전압을 증대시키므로 고승압 대전력 응용에서 소자의 선정이 용이하다. 특히 고주파변압기 턴 비를 작게 할 수 있고 DC 오프셋이 제거되어 최적의 변압기 설계가 가능하며, 3개의 코아로 전력이 분배되어 Low Profile 및 열 분산에 유리하다. 제안하는 컨버터는 전 영역(0 ∼ 1)의 듀티 사용으로 스타트업 및 추가의 클램프회로가 필요 없으며 입력전압 변동이 큰 응용에 적합하다. 또한 넓은 듀티영역에서 스위치의 ZVS 턴온과 다이오드의 ZCS 턴온 턴오프가 성취되므로 고효율을 달성할 수 있다. 제안하는 컨버터를 5 kW급 시작품으로 검증하였다.

단일 스위치와 전압 체배 회로를 이용하는 고변압비와 낮은 전압 스트레스를 가진 새로운 비절연형 DC-DC 컨버터 토폴로지 (Novel Non-Isolated DC-DC Converter Topology with High Step-Up Voltage Gain and Low Voltage Stress Characteristics Using Single Switch and Voltage Multipliers)

  • Tran, Manh Tuan;Amin, Saghir;Choi, Woojin
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2019년도 전력전자학술대회
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    • pp.83-85
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    • 2019
  • The use of high voltage gain converters is essential for the distributed power generation systems with renewable energy sources such as the fuel cells and solar cells due to their low voltage characteristics. In this paper, a high voltage gain topology combining cascode Inverting Buck-Boost converter and voltage multiplier structure is introduced. In proposed converter, the input voltage is connected in series at the output, the portion of input power is directly delivered to the load which results in continuous input current. In addition, the voltage multiplier stage stacked in proper manner is not only enhance high step-up voltage gain ratio but also significantly reduce the voltage stress across all semiconductor devices and capacitors. As a result, the high current-low voltage switches can be employed for higher efficiency and lower cost. In order to show the feasibility of the proposed topology, the operation principle is presented and the steady-state characteristic is analyzed in detail. A 380W-40/380V prototype converter was built to validate the effectiveness of proposed converter.

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높은 승압비를 갖는 부스트-플라이백 컨버터의 개선된 모델링 방법 (Improved Modeling and Control of Boost-Flyback Converter With High Step-Up Voltage Ratio)

  • 서상욱;이귀준;김래영;현동석
    • 전력전자학회논문지
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    • 제17권1호
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    • pp.67-76
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    • 2012
  • This paper proposes the aggregated modeling and control of integated boost-flyback converter (IBFC) for understanding of dynamics characteristic and designing of relevant controller. The basic concept of the aggregated modeling is to substitute the boost or the flyback converter with an equivalent current source. Since each converter with equivalent current source corresponds to the basic boost and flyback converters, the overall mathematical process is significantly simplified for the modeling. Afterwards each result is combined to construct the complete model of the IBFC, and the relevant controller is designed through the achieved small-signal model. Simulation and experimental results show excellent agreement with the theoretical expectations.

고전압비와 낮은 전압 스트레스를 가진 단일 스위치와 전압 체배 회로를 이용한 새로운 비절연형 DC-DC 컨버터 (A Novel Non-Isolated DC-DC Converter using Single Switch and Voltage Multipliers with High Step-Up Voltage Gain and Low Voltage Stress Characteristics)

  • 트란 만 투안;사기르 아민;최우진
    • 전력전자학회논문지
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    • 제25권3호
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    • pp.157-161
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    • 2020
  • High voltage gain converters are essential for distributed power generation systems with renewable energy sources, such as fuel cells and solar cells, because of their low voltage characteristics. This paper introduces a novel nonisolated DC-DC converter topology developed by combining an inverting buck-boost converter and voltage multipliers. In the proposed converter, the input voltage is connected in series with the output, and the majority of the input power is directly delivered to the load. The voltage multipliers are stacked in series to achieve high step-up voltage gain. The voltage stress across all of the switches and capacitors can be significantly reduced. As a result, the switches with low voltage ratings can be used to achieve high efficiency and low cost. To verify the validity of the proposed topology, a 360-W prototype converter is built to obtain the experimental results.

고전압 변환비의 자려 발진 DC/DC Converter (Self Oscillation DC/DC Converter with High Voltage Step Up Ratio)

  • 정용준;한상규;홍성수;노정욱
    • 전력전자학회논문지
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    • 제14권3호
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    • pp.220-227
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    • 2009
  • 본 논문은 고전압 DC 파워 서플라이 적용을 위한 높은 전환 비의 자려발진 DC/DC 전력 변환 회로에 관한 것으로써, 하나의 스위치, 하나의 인덕터, 그리고 다수개의 캐패시터와 다이오드로 구성된다. 기존의 극성 반전 형DC/DC 컨버터 회로와 비교하여, 고압 변환 트랜스포머 대신에 인덕터를 사용할 수 있어, 자기 소자의 부피 및 크기는 물론 원가저감이 가능하다. 또한 자려 발진(Self Oscillation) 방식을 사용하여 별도의 제어 IC가 필요 없으므로, 회로구성이 대단히 간단하고, 저가격의 전원 회로를 만들 수 있다. 또한 다이오드들의 전압 스트레스가 감소하여 저가격 고성능의 고압 변환장치 구현이 가능하다. 제안된 회로의 동작원리를 설명하고, 타당성을 Simulation 및 실험을 통하여 검증한다.

Analysis and Implementation of a New Single Switch, High Voltage Gain DC-DC Converter with a Wide CCM Operation Range and Reduced Components Voltage Stress

  • Honarjoo, Babak;Madani, Seyed M.;Niroomand, Mehdi;Adib, Ehsan
    • Journal of Power Electronics
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    • 제18권1호
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    • pp.11-22
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    • 2018
  • This paper presents a single switch, high step-up, non-isolated dc-dc converter suitable for renewable energy applications. The proposed converter is composed of a coupled inductor, a passive clamp circuit, a switched capacitor and voltage lift circuits. The passive clamp recovers the leakage inductance energy of the coupled inductor and limits the voltage spike on the switch. The configuration of the passive clamp and switched capacitor circuit increases the voltage gain. A wide continuous conduction mode (CCM) operation range, a low turn ratio for the coupled inductor, low voltage stress on the switch, switch turn on under almost zero current switching (ZCS), low voltage stress on the diodes, leakage inductance energy recovery, high efficiency and a high voltage gain without a large duty cycle are the benefits of this converter. The steady state operation of the converter in the continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is discussed and analyzed. A 200W prototype converter with a 28V input and a 380V output voltage is implemented and tested to verify the theoretical analysis.

대용량 승압형 위상천이 병렬입력/직렬출력 듀얼 컨버터의 분석 (An analysis of a phase- shifted parallel-input/series-output dual converter for high-power step-up applications)

  • 강정일;노정욱;문건우;윤명중
    • 전력전자학회논문지
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    • 제6권5호
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    • pp.400-409
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    • 2001
  • 대용량 승압형 응용을 위한 새로운 위상천이 병렬입력/직렬출력 듀얼 컨버터가 제안된 바 있다. 제안된 컨버터는 종래의 펄스 폭 변조(PWM) 방식의 병렬입력/직렬출력 듀얼 컨버터에 비해 낮은 스위치 전압 스트레스를 보여 저 손실의 소자를 사용할 수 있으므로 높은 효율을 보인다. 또한, 출력 캐패시터의 실효(RMS) 전류 스트레스가 낮고 입력 전류와 출력 전압의 맥동이 작으며, 제어 입력에 대한 출력 전압의 동역학(dynamics)이 빠른 장점이 있다. 본 논문에서는 제안된 컨버터의 정상상태 동작을 심도 있게 분석하고 그 수학적 모델 및 정상상태 해를 제시하며, 제안된 컨버터의 특징을 종래의 PWM 방식의 컨버터와의 비교를 통해 정량적으로 분석한다. 또한, 제안된 회로의 동작, 특성 및 유효성을 검증하기 위해 800W급 24-350Vdc 사양의 시작품으로부터의 실험 결과를 제시한다.

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Switched Inductor Z-Source AC-DC Converter

  • Sedaghati, Farzad;Hosseini, Seyed Hossein;Sarhangzadeh, Mitra
    • Journal of international Conference on Electrical Machines and Systems
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    • 제1권1호
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    • pp.67-76
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    • 2012
  • Due to the increasing amount of applications of power electronic ac-dc converters, it is necessary to design a single-stage converter that can reliably perform both buck and boost operations. Traditionally, this can be achieved by double-stage conversion (ac/dc-dc/dc) which ultimately leads to less efficiency and a more complex control system. This paper discusses two types of modern ac-dc converters. First, the novel impedance-source ac-dc converter, abbreviated as custom Z-source rectifier, is analyzed; and then, switched inductor (SL) Z-source ac-dc converter is proposed. This paper describes the Z-source rectifiers' operating principles, the concepts behind them, and their superiorities. Analysis and simulation results show that the proposed custom Z-source rectifier can step up and step down voltage; and the main advantage of the SL Z-source ac-dc converter is its high step-up capability. Low ripple of the output dc voltage is the other advantage of the proposed converters. Finally, the SL Z-source ac-dc converter is compared with the custom Z-source ac-dc converter.