• 전력전자학회논문지
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• 제25권5호
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• pp.350-357
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• 2020

This study presents the design of an 18 kW two-phase interleaved buck converter that uses a coupled inductor for an electric vehicle rapid charger. The designs of a two-phase coupled inductor for current ripple and physical size reduction and a two-phase interleaved buck converter based on silicon carbide metal - oxide - semiconductor field-effect transistor for high efficiency were described in detail. The operating principle of the two-phase interleaved buck converter was analyzed, and the coupled inductor was investigated using a magnetized equivalent circuit. Simulation and experiments were conducted to verify the validity of the proposed two-phase interleaved buck converter, and the theoretical design method and experimental results were confirmed.

• 전력전자학회논문지
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• 제18권6호
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• pp.547-555
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• 2013

This paper proposes the interleaved buck converter using a soft switching auxiliary circuit. In this scheme, an auxiliary circuit is added to the conventional interleaved buck converter and used to achieve soft-switching conditions for both the main switch and freewheeling diode. In addition, the switch in the auxiliary circuit operates under soft-switching conditions. Also, according to the input to output conditions, the main switch achieved zero-current-transition(ZCT) or zero-current & zero-voltage-transition(ZCZVT) at turn on. Thus, the proposed interleaved buck converter provides a higher efficiency. The basic operations, in this paper, are discussed and design guidelines are presented. The usefulness of the proposed converter is verified on a 200kHz, 180W prototype converter.

• 전력전자학회논문지
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• 제19권2호
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• pp.116-123
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• 2014

In this paper, a soft-switching scheme for the PWM interleaved buck converter(IBC) is newly proposed to obtain the advantages of both the conventional PWM interleaved buck and resonant converters such as ease of control, reduced switching losses and stresses, and low EMI. To obtain the soft-switching action, the proposed scheme employs an auxiliary circuit, which is added to the conventional interleaved buck converter and used to achieve soft-switching for both the main switches and the output diodes while not incurring any additional losses due to the auxiliary circuit itself. In this paper, the basic operations are discussed and design guidelines are presented. And through the experimental results, the usefulness of the proposed converter is verified.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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• pp.506-510
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• 2004

A multi-phase interleaved buck converter is used to reduce current ripples and filter size of a power supply. This paper addresses the modelling and steady-state analysis of the multi-phase interleaved buck converter operated in discontinuous inductor current mode. The model is derived using an averaging technique in steady state. The do voltage ratio and the range of the discontinuous inductor current mode(DICM) and the continuous output current mode(COCM) are derived from the averaged state-space model. In addition, the efficiency is investigated according to the number of phase.

• IEIE Transactions on Smart Processing and Computing
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• 제6권1호
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• pp.47-52
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• 2017

Inductor in high power converter system increases production cost, volume and core loss proportional to the power. To decrease these disadvantages, this paper analyzed the characteristic of parallel-inductor and coupled-inductor in interleaved system with simulation. As a result, it is confirmed that two-phase interleaved non-coupled buck-converter has the best characteristic among three types converter.

• 한국전자파학회논문지
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• 제28권4호
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• pp.298-308
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• 2017

본 논문에서는 DC-DC Converter에서의 고조파로 인한 전자기적 잡음을 줄이기 위해 Random PWM을 적용한 Interleaved Buck Converter(IBC) 시스템을 제안한다. PWM 직류전원장치에서 스위칭 방식을 사용하는 경우 스위칭 손실 및 EMI 문제가 발생하기 때문에 많은 고조파를 포함하고 있어 선간 전압의 왜곡 등을 유발한다. 따라서 이에 대한 해결방법으로 PRBS를 이용한 IBC를 최초로 제안한다. 이 방식의 회로 구조는 2개의 능동형 스위치를 가지며 180도의 위상차를 갖는 2개의 PWM 신호를 이용하여 회로를 제어한다. IBC는 1세트의 스위치를 추가하기 때문에, 비용 측면 등에서는 불리 할 수 있으나 전력분배, 출력전류 리플 감소, 빠른 회로 반응속도, 수동소자크기 감소의 이점을 가진다. 본연구의 타당성을 확인하기 위하여 PSIM 시뮬레이터를 이용하였고 Random PWM을 적용한 IBC 회로를 설계하여 기존의 PWM과 RPWM 방식만을 사용하는 Buck-converter 회로를 PSIM 시뮬레이터를 이용하여 결과를 확인하고 분석하였다.

• 융합신호처리학회논문지
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• 제8권3호
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• pp.199-204
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• 2007

This paper presents design of interleave configured dc-dc converter for high power distributed power system applications. The multi channel interleaving buck converter with small inductance has proved to be suitable for micro-grid, requiring medium output voltages, high output currents and fast transient response. Integrated magnetic components are used to reduce the size of the converter and improve efficiency. Unlike conventional methods, the distributed approach requires no centralized control, automatically accommodates varying numbers of converter cells, and is highly tolerant of subsystem failures. A general methodology for achieving distributed interleaving is proposed, along with a specific implementation approach. The design and simulation verification of switching frequency 10 kHz system is presented with interleaved clocking of the converter cells. The simulation (simulated by PSIM 6.1) results corroborate the analytical predictions and demonstrate the tremendous benefits of the distributed interleaving approach.

• 전력전자학회논문지
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• 제12권2호
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• pp.123-130
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• 2007

본 논문에서는 불연속 인덕터 전류모드에서의 다상 교호 강압 컨버터의 정상상태 해석 및 소신호 모델을 유도하여 일반화된 식을 제시한다. 컨버터의 제어기 설계를 위해서 필요한 완전한 차수 모델을 통한 소신호 모델의 전달함수를 유도하고 이를 통해 시스템의 동특성을 분석한다. 시뮬레이션 및 실험 결과를 통하여 이론에서 제시한 특성을 검증한다.

• 전력전자학회논문지
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• 제19권6호
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• pp.481-487
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• 2014

This study proposes a two-phase non-inverting buck-boost converter that uses a coupled inductor. The multi-phase converter has many advantages over single-phase counterparts, such as reduced output current ripple and conduction loss in switching devices and passive elements. Although the output current ripple of the multi-phase converter is reduced significantly because of the interleaved effect, the inductor current ripple is not reduced in multi-phase converters. One of the solutions to this problem is to use a coupled inductor. A 4 kW prototype converter is built and tested to verify the performance of the proposed converter.

• Journal of Power Electronics
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• 제5권2호
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• pp.104-108
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• 2005

This paper presents the performance improvement of voltage-mode controlled interleaved synchronous buck converters. This is a voltage-mode controlled scheme, where the controllers do not need an external saw-tooth generator for PWM generation and the loop design is easier. The controller implementation requires only a single error amplifier and gives almost current mode control performance. The control scheme uses voltage feedback with two loops similar to current mode control: one for the slow outer loop and the other for the faster inner PWM control loop. To improve the performance of the converter system a coupled inductor is used. This coupled inductor reduces the magnetic size and also improves the converter's transient performance without increasing the steady-state current ripple. The effectiveness of the proposed control scheme is demonstrated through PSIM simulations.