• 제목/요약/키워드: Voltage gain characteristics

검색결과 263건 처리시간 0.03초

고변압비와 고효율 특성을 가진 새로운 비절연형 벅부스트 컨버터 (A Novel Non-Isolated Buck Boost Converter with High Voltage Gain and High Efficiency Characteristics)

  • 트란 만 투안;사기르 아민;최우진
    • 전력전자학회논문지
    • /
    • 제24권5호
    • /
    • pp.319-326
    • /
    • 2019
  • The use of high-voltage gain converters is essential for distributed power generation systems with renewable energy sources, such as fuel and solar cells, due to their low-voltage characteristics. In this study, a novel high-voltage gain non-isolated buck boost converter topology is proposed to cope with the need of a high-voltage conversion ratio without the transformer for the renewable energy sources. Given that the proposed topology utilizes the cascode structure, the voltage gain and the efficiency are higher than those of other conventional non-isolated converters. To demonstrate the feasibility of the proposed topology, the operation principle is presented, and the steady-state characteristics are analyzed in detail. The validity of the proposed converter is verified by experiments with a 400 W prototype converter.

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
    • /
    • 전력전자학회 2019년도 전력전자학술대회
    • /
    • pp.83-85
    • /
    • 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.

  • PDF

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
    • /
    • 제25권3호
    • /
    • pp.157-161
    • /
    • 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.

Pb[(Mn1/3Sb2/3)0.05Zr0.475]O3세라믹스를 이용한 변형 Ring/Dot형 압전세라믹 변압기의 감압특성 (Voltage Step-down Characteristics of Modified Ring/Dot-type Piezoelectric Transformer using Pb[(Mn1/3Sb2/3)0.05Zr0.475]O3 Ceramics)

  • 남성진;남효덕;손준호;이준형
    • 한국전기전자재료학회논문지
    • /
    • 제17권2호
    • /
    • pp.171-177
    • /
    • 2004
  • Voltage step-down characteristics in Ring/Dot type piezoelectric transformer were examined as a function of the area of input electrode when the area of output electrode is fixed. The effects of driving frequency and load resistance on the voltage step-down characteristics were also examined. Voltage gain was greatly dependent on the driving frequency and load resistance, and showed a maximum gain at resonance frequency of the step-down transformer. The frequency where the maximum cutout voltage appears increased about 0.2% as the load resistance increased from 10 to 150 Ω. As the area of input electrode increased, the voltage gain and the efficiency of the transformer increased. Frequency dependence of efficiency of the step-down transformer revealed a similar tendency with the voltage gain curves. The maximum efficiency remarked 94% when the input voltage and the load resistance were 20 Vpp and 120 Ω, respectively.

집중 등가회로를 사용한 압전 변압기의 승합비 및 효율 해석 (Voltage Gain and Efficiency Analysis of Piezoelectric Transformer using Lumped constant Equivalent Circuit)

  • 류주현;이용우;윤광희;정희승;정영호;박창엽
    • 한국전기전자재료학회논문지
    • /
    • 제11권10호
    • /
    • pp.849-854
    • /
    • 1998
  • The load characteristics on the voltage gain and efficiency were analyzed using a lumped constant equivalent circuit of the piezoelectric transformer. These analytical results were confirmed by experiments. Theoretical values of voltage gain were nearly constant with experimental ones. However, It was shown that theoretical values of efficiency is higher than experimental ones.

  • PDF

Rosen형 압전 트랜스포머의 집중등가회로를 사용한 승압비 및 효율 해석 (Voltage Gain and Efficiency Ana1ysis of Piezoelectric Transformer using Lumped Constant Equivalent Circuit)

  • 김만성;류주현;정회승;박창엽;정영호
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 1998년도 춘계학술대회 논문집
    • /
    • pp.183-189
    • /
    • 1998
  • In this paper, The load characteristics on the voltage gain and efficiency were analyzed sing an lumped constant equivalent circuit of the piezoelectric transformer. These analytical results are confirmed by experiments. Theoretical values of voltage gain were nearly constant with experimental ones. However, It was shown that theoretical values of efficiency had higher values than experimental ones.

  • PDF

Ring-dot형 감압형 압전변환기의 제작과 특성 (Fabrication and Characteristics of Ring-Dot type Piezoelectric Transformer)

  • 남성진;이영민;남효덕;손준호;이준형
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
    • /
    • pp.722-725
    • /
    • 2004
  • Voltage step-down characteristics in Ring/Dot type piezoelectric transformer were examined as a function of the area of input electrode when the area of output electrode is fixed. The effects of driving frequency and load resistance on the voltage step-down characteristics were also examined. Voltage gain was greatly dependent on the driving frequency and load resistance, and showed a maximum gain at resonance frequency of the step-down transformer. The frequency where the maximum output voltage appears increased about 0.2% as the load resistance increased from 10 to $150\Omega$. As the area of input electrode increased, the voltage gain and the efficiency of the transformer increased. Frequency dependence of efficiency of the step-down transformer revealed a similar tendency with the voltage gain curves. The maximum efficiency remarked 94% when the input voltage and the load resistance were 20 $V_{PP}$ and $120\Omega$, respectively.

  • PDF

넓은 입·출력 전압이득 특성을 갖는 3 브리지 LLC 공진컨버터 (A 3-Bridge LLC Resonant Converter with Wide Input/Output Voltage Gain Characteristics)

  • 유상재;장기찬;김은수;전용석;국윤상
    • 전력전자학회논문지
    • /
    • 제25권2호
    • /
    • pp.142-151
    • /
    • 2020
  • This paper presents a DC/DC LLC resonant converter with wide input/output voltage gain characteristics and its control method for efficiency improvement. For a wide input/output voltage gain characteristics without designing small transformer magnetization inductance, the proposed converter changes the topology into three modes of operation according to the main switch switching pattern. In each operating mode, variable LINK voltage modulation and frequency modulation were performed to control output voltage and improve operating efficiency. A prototype of a 5-kW DC/DC LLC resonant converter was built and tested to verify the validity and applicability of the proposed converter.

PZT계 압전 세라믹 변압기의 감압특성 (Characteristics of Step-Down Transformer in PZT Piezoelectric Ceramics)

  • 김오수;이준형;손정호;남효덕;조상희
    • 한국전기전자재료학회논문지
    • /
    • 제14권11호
    • /
    • pp.885-891
    • /
    • 2001
  • Ring/dot-type step-down piezoelectric transformer was manufactured by using Pb[(Mn$\sub$1/3/Sb$\sub$2/3)$\sub$0.05/Zr$\sub$0.475/Ti$\sub$0.475/]O$_3$ ceramics, which have excellent high-power piezoelectric properties. The characteristics of step-down piezoelectric transformer as a function of load resistance at output terminal was examined. Voltage gain was greatly dependent on drive frequency and load resistance, and showed maximum voltage gain at the resonance frequency. The output voltage was linearly increased as the input voltage increased. Voltage gain of the step-down piezoelectric transformer with respect to input voltage was very stable when the load resistance was in the range of 50-500 $\Omega$ .

  • PDF

H-type Structural Boost Three-Level DC-DC Converter with Wide Voltage-Gain Range for Fuel Cell Applications

  • Bi, Huakun;Wang, Ping;Che, Yanbo
    • Journal of Power Electronics
    • /
    • 제18권5호
    • /
    • pp.1303-1314
    • /
    • 2018
  • To match the dynamic lower voltage of a fuel cell stack and the required constant higher voltage (400V) of a DC bus, an H-type structural Boost three-level DC-DC converter with a wide voltage-gain range (HS-BTL) is presented in this paper. When compared with the traditional flying-capacitor Boost three-level DC-DC converter, the proposed converter can obtain a higher voltage-gain and does not require a complicate control for the flying-capacitor voltage balance. Moreover, the proposed converter, which can draw a continuous and low-rippled current from an input source, has the advantages of a wide voltage-gain range and low voltage stress for power semiconductors. The operating principle, parameters design and a comparison with other converters are presented and analyzed. Experimental results are also given to verify the aforementioned characteristics and theoretical analysis. The proposed converter is suitable for application of fuel cell systems.