• Title, Summary, Keyword: Buck-boost operation

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A Single-phase Buck-boost AC-AC Converter with Three Legs

  • Zhou, Min;Sun, Yao;Su, Mei;Li, Xing;Liu, Fulin;Liu, Yonglu
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.838-848
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    • 2018
  • This paper proposes a single-phase buck-boost AC-AC converter. It consists of three legs with six switching units (each unit is composed of an active switch and a diode) and its input and output ports share a common ground. It can provide buck-boost voltage operation and immune from shoot-through problem. Since only two switching units are involved in the current paths, the conduction losses are low, which improves the system efficiency. The operation principle of the proposed circuit is firstly presented, and then, various operation conditions are introduced to achieve different output voltages with step-changed frequencies. Additionally, the parameters design and comparative analysis of the power losses are also given. Finally, experimental results verify the correctness of the proposed converter.

Analysis of Operation Characteristic of Parallel Cascade Buck-Boost Converter (Cascaded Buck-Boost 컨버터 병렬 구성에 따른 동작특성 분석)

  • Kim, Min-Jung;Kim, Dong-Hee;Lee, Byoung-Kuk
    • Proceedings of the KIPE Conference
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    • pp.149-150
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    • 2013
  • 비반전 승강압형 토폴로지인 Cascaded Buck-Boost는 크게 Buck단과 Boost단으로 나눌 수 있다. 2상 병렬로 연결되는 Cascaded Buck-Boost 컨버터는 병렬로 연결되는 소자에 따라서 총 3가지의 회로 구성이 가능하며, 제어방법에 따라 1개의 스위치로도 Interleaved 회로처럼 동작이 가능하다. 본 논문에서는 각각의 Cascade Buck-Boost 컨버터의 병렬 구성에 따른 입출력 전압비, 전류리플, 시스템 효율 등을 분석한다.

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Resonant Parametric Perturbation Method to Control Chaos in Current Mode Controlled DC-DC Buck-Boost Converter

  • Kavitha, Anbukumar;Uma, Govindarajan
    • Journal of Electrical Engineering and Technology
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    • v.5 no.1
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    • pp.171-178
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    • 2010
  • Resonant parametric perturbation (RPP) method is an effective non-feedback method for controlling chaos. In this paper, the above method is applied for the current programmed buck-boost dc-dc converter which exhibits chaotic for wide parameter variations. The different possible operating regimes leading to chaotic operation of the current mode controlled buck-boost converter is discussed and the control of chaos by RPP method is demonstrated through computer simulations and experimental studies. The converter is stabilized to period 1 operation practically.

Low-Cost High-Efficiency Two-Stage Cascaded Converter of Step-Down Buck and Tapped-Inductor Boost for Photovoltaic Micro-Inverters (태양광 마이크로 인버터를 위한 탭인덕터 부스트 및 강압형 컨버터 캐스케이드 타입 저가형 고효율 전력변환기)

  • Jang, Jong-Ho;Shin, Jong-Hyun;Park, Joung-Hu
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.2
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    • pp.157-163
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    • 2014
  • This paper proposes a two-stage step-down buck and a tapped-inductor boost cascaded converter for high efficiency photovoltaic micro-inverter applications. The proposed inverter is a new structure to inject a rectified sinusoidal current into a low-frequency switching inverter for single-phase grid with unity power factor. To build a rectified-waveform of the output current. the converter employs both of a high efficiency step-up and a step-down converter in cascade. In step-down mode, tapped inductor(TI) boost converter stops and the buck converter operates alone. In boost mode, the TI converter operates with the halt of buck operation. The converter provides a rectified current to low frequency inverter, then the inverter converts the current into a unity power-factor sinusoidal waveform. By applying a TI, the converter can decrease the turn-on ratios of the main switch in TI boost converter even with an extreme step-up operation. The performance validation of the proposed design is confirmed by an experimental results of a 120W hardware prototype.

Transient Current Suppression Scheme for Bi-Directional DC/DC Converters in 42V Automotive Power Systems

  • Lee, Woo-Cheol;Yoo, Chang-Gyu;Lee, Kyu-Chan;Cho, Bo-Hyung
    • Journal of Power Electronics
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    • v.9 no.4
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    • pp.517-525
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    • 2009
  • 42V electrical power systems are on their way to replacing the present l4V systems in automobiles and 42V/14V dual voltage systems have been proposed to provide backward compatibility with the existing components for the 14V systems. A synchronous buck/boost converter is an attractive topology for 42V/14V dual voltage systems since it offers the possibility of bi-directional operation without additional components. In this paper, transient currents generated during converter startup or changes in operation modes between buck and boost are analyzed and a cost effective solution to remove the transient currents is proposed. The validity of the proposed control strategy is investigated through simulation and experiment with bi-directional converters.

Efficiency Improvement of New Soft Switching Type Buck-Boost Chopper (새로운 소프트 스위칭형 벅-부스터 컨버터의 효율개선)

  • 고강훈;곽동걸;서기영;권순걸;이현우
    • Proceedings of the KIPE Conference
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    • pp.44-48
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    • 1998
  • In the buck-boost DC-DC converter which is used at a certain situation such as in factories where loads often change a lot, the switches in the device make big energy loss in operating at Buck-Boost Mode due to hard switching and are affected by lots of stresses which decrease the efficiency rate of the converter. In order to improve this problem, to decrease the loss of snubber and switching, it has been investigated that zero voltage switching mode and zero current switching mode which make the operation of switches with soft switching. For the more sophisticated and advanced device, this paper is presented the Partial Resonant Soft Switching Mode Power Converter which is adapted the power converter having the partial resonant soft switching mode, that makes switches operate when the resonant current or voltage becomes zero by making the resonant circuit partially at turning on and off of the switches with suitable layout of the resonant elements and switch elements in the converter. Also, this paper includes the analysis and simulation of the Partial Resonant type Buck-Boost Chopper.

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A Comparison of Operation Characteristics for $3\Phi$Boost/Buck Converter to Inverter Arc Welding Machine (인버터 아크용접기를 위한 3상 승압/강압형 컨버터의 운전특성비교)

  • 최해룡;구영모;채영민;최규하;목형수;김규식;원충연
    • Proceedings of the KIPE Conference
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    • pp.260-264
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    • 1998
  • Three phase Boost/Buck converter which have economical merits and simple control scheme, are analyzed and evaluated through comparative methods and digital simulation for equivalent load. Those play a part of voltage boost/buck as well as power factor correction with single switch. Controller operating in constant and variable frequency is used for rapid output response and stable system condition respectively. Moreover low THD property of single switched converters is available for inverter arc welding machine known as high power and low power factor. So, in this paper a comparison of the characteristics in boost and buck converter is described and then simulation results conforms the merits from point of view of power factor and voltage regulator.

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Single-Phase Z-Source AC-AC Converter (SZAC) with Buck/Boost In-Phase and Out-Of-Phase Operation

  • Khai, Nguyen Minh;Jung, Young-Gook;Lim, Young-Cheol
    • Proceedings of the KIPE Conference
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    • pp.376-378
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    • 2008
  • A new family of single-phase Z-source ac-ac converter(SZAC) based on single-phase matrix converter (SPMC) is proposed in this paper. Compared to conventional Z-source ac-ac converter, the proposed SZAC has unique feature: providing a wide range of output ac voltage with buck/boost in-phase (maintaining phase angle) and buck/boost out-of-phase (reversing phase angle) operation. A new commutation strategy is used to eliminate voltage spikes on switches. The operating principle of the proposed SZAC is presented. Analysis and experimental results are also presented.

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Z-Source Four-Switch Three-Phase PWM Rectifier with Wide DC Output Voltage Control Region (넓은 직류 출력전압 제어영역을 갖는 Z-소스 Four-Switch 3상 PWM 정류기)

  • Zhu, Sha;Jung, Young-Gook;Lim, Young-Cheol
    • Proceedings of the KIPE Conference
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    • pp.275-276
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    • 2013
  • In this paper, we proposed the Z-source four-switch three-phase rectifier. As we know, the conventional Four-Switch Three-Phase Rectifier(FSTPR) has advantages of the lower cost and less complex switching control. However, The conventional FSTPR can only either perform buck or boost operation, it can only attain the buck-boost operation by adding another DC-DC converter. In addition, besides its narrow output voltage region, distortion of the input current is serious either. Thus, we proposed the Z-source FSTPR which has buck-boost function and better input current waveform by applying the Z-impedance network to the conventional FSTPR. The validity of the proposed system was confirmed by experiments.

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Average-Current-Mode Control of Pseudo-Continuous Current Mode BUCK-BOOST Type Solar Array Regulator (의사-연속전류모드 벅-부스트 형 태양전력 조절기의 평균전류모드제어)

  • Yang, JeongHwan;Yun, SeokTeak
    • Journal of Satellite, Information and Communications
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    • v.7 no.2
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    • pp.72-75
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    • 2012
  • A solar array makes a Solar Array Regulator (SAR) for Low-Earth-Orbit satellite have different small signal characteristic. Therefore, an Average-Current-Mode (ACM) controller cannot control the BUCK-BOOST type SAR which operates in a current region of the solar array. In this paper, we present the Pseudo-Continuous Current Mode (PCCM) BUCK-BOOST Type SAR which can be controller by the ACM Controller. We explain the circuit operation of the PCCM BUCK-BOOST Type SAR, derive its small signal transfer function and design ACM Controller. Finally, we verify the ACM control of the PCCM BUCK-BOOST Type SAR by using a simulation.