• 전력전자학회:학술대회논문집
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.19-21
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• 2006

In contrast with DC source, Fell cell has non linear characteristics that has lange voltage fluctuation due to load variation, and slow dynamic characteristics. when the loads are increase, the ripples of input and output voltage, also power densities, of inductor, capacitor, and switching devices, are bulky. This paper presents Interleaved boost converter using Fuel cell stacks, proposed converter has merits to promote power densities without increasing loss. Because each converter has same switching frequency and constant phase difference. In this paper, Interleaved boost converter was design for 1[kW], it's validity was proved by simulation and experiments.

• Journal of Electrical Engineering and Technology
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• 제8권1호
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• pp.137-143
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• 2013

This paper presents development of variable speed generation (VSG) system with energy saving function. The rubber tyred gantry crane (RTGC) requires the power from diesel-engine. Significant fuel savings by reducing the engine speed can be achieved, because all of operation modes except hoisting are required lower power than rated value of engine. When low speed operation output voltage of generator is decrease until acceptable range of motor driver inverters and auxiliary load supplier. According to power demand engine speed is varying from 20 to 60Hz, and voltage is varying between 210Vac and 480Vac. When idle mode or low power operation dc/dc converter operates by constant output voltage control and inverters dc site voltage is compensated by it. This paper proposed 3-phase interleaved boost converter which has the same structure as the commercially available 3-phase inverter and current sharing capability. 400kW interleaved converter is designed and a performance of converter is evaluated through several experiments with a RTGC system. Energy saving VSG system can cut down fuel consumption by 36% and 21.3% at idle and unidirectional load operations.

• Journal of Power Electronics
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• 제17권3호
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• pp.821-834
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• 2017

This paper reports on a single-inductor multiple-output step-up converter with digital control. A systematic analog-to-digital-controller design is explained. The number of digital blocks in the feedback path of the proposed converter has been decreased. The simpler digital pulse-width modulation (DPWM) architecture is then utilized to reduce the power consumption. This architecture has several advantages because counters and a complex digital design are not required. An initially designed unit-delay cell is adopted recursively for the construction of coarse, intermediate, and fine delay blocks. A digital limiter is then designed to allow only useful code for the DPWM. The input voltage is 1.8 V, whereas output voltages are 2 V and 2.2 V. A co-simulation was also conducted utilizing PowerSim and Matlab/Simulink, whereby the 55 nm process was employed in the experimental results to evaluate the performance of the architecture.

• 조명전기설비학회논문지
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• 제23권1호
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• pp.182-187
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• 2009

본 논문에서는 에너지 하베스팅의 일환으로 상용의 RFID시스템의 리더 안테나에서 방사되는 RF에너지를 활용하여 무선센서노드의 전원부를 구성하고자 하였다. 이를 위해 렉테나(Rectenna)를 구성하고 효율이 높은 부스트 컨버터를 구성하여 RF전력으로부터 배터리를 충전할 수 있는 DC전력을 얻도록 하였다. RFID 안테나로부터 1.2[W] RF출력 시, 구현된 렉테나로 1[m]거리에서 3.1[mW], 5.5[m]에서 1[mW]정도의 전력을 얻을 수 있었다. 배터리와 연결 시 변환효율을 높이기 위한 부스트 컨버터의 특성은 4[m]거리에서 변환효율 79.3[%], 실제 변환되어 배터리를 충전할 수 있는 전력은 1.36[mW]를 얻을 수 있었으며, 이 값은 무선센서노드로 응용이 가능한 값이다.

• 한국항행학회논문지
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• 제26권1호
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• pp.35-45
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• 2022

본 논문에서는 PV 시스템에서 태양광 발전 시스템의 완전한 동작을 위해 DC-DC 벅-부스트 컨버터와 MPPT (Maximum Power Point Tracking)제어 시스템에 대한 완전한 동작 시스템에 대해 모델링하고 시뮬레이션을 수행하여 양호한 동작을 확인하고자 한다. 이를 위해 이중층 커패시터(EDLC:Electric double-layer capacitors )를 사용한 순간전압강하 보상장치가 개발되어 적용되고 있다. 따라서 태양광 발전의 ESS(Energy Storage System)를 고려한 PCS(Power Conditioning System)를 제안하여 부하평준화를 통한 전력의 안정적인 공급을 확인한다. 본 논문에서는 순간전압강하 보상장치(DVR :Dynamic Voltage Restorer)에 사용되는 전기 이중층 커패시터에 비해 동일 사이즈 대비 에너지 밀도가 높은 하이브리드 커패시터(hybrid capacitor)를 적용하는 연구를 하였고, 단상 3[kW] 계통 연계형 태양광 전력변환기를 제안하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.2055-2057
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• 1997

In this study, we present the DPS system which is consist of several converters in parallel and supply the power to the load. The characteristics of the DPS using AC-bus or DC-bus, and load current sharing technique are discussed. We apply these techniques to the high-power paralleled DC/DC converter, and present the design requirements considered in the system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.109-112
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• 1988

All parasitics such as switch conduction voltages, conduction resistances, switching times and ESR''s of capacitors are counted in the new state-space modeling based on non-ideal switching functions. An equivalent simplified model is derived from the complex circuit with parasitics. Hence the results are very simple and exact, which are very important features of modelings. The pole frequency, dc voltage gain, and efficiency of the general converter, the buck-boost converter are analyzed and verified by the experiments with good agreements with the theories. This may be a good summary for the previous works concerned with parasitics.

• Journal of Power Electronics
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• 제1권2호
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• pp.71-77
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• 2001

This paper proposes a new zero-current switching (ZCS) pulse-width modulation (PWM) switch cell that has no additional conduction loss of the main switch. In this cell, the main switch and the auxiliary switch turn on and turn off under zero current condition. The diodes commutate softly and the reverse recovery problems are alleviated. The conduction loss and the current stress of the main switch are minimized, since the resonating current stress of the main switch are minimized, since the resonating current for the soft switching does not flow through the main switch. Based on the proposed ZCS PWM switch cell, a new family of DC to DC PWM converters is derived. The new family of ZCS PWM converters is suitable for the high power applications employing IGBTs. Among the new family of DC to DB PWM converters, a boost converter was taken as an example and has been analyzed. Design guidelines with a design example are described and verified by experimental results from the 2.5 kW prototype converter operating at 40 kHz.

• 전력전자학회논문지
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• 제22권2호
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• pp.134-139
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• 2017

In this study, an inductive power transfer (IPT) charger for electric vehicles is proposed to improve the entire system efficiency and power density by eliminating the DC-DC converter in the secondary side. In the proposed IPT charger, the DC-link voltage is adjusted according to the coupling coefficient through cascade buck-boost converter in the front-end side, and the bridgeless rectifier performs the charging of battery. The control algorithm for the proposed IPT system is theoretically explained, and the validity of the proposed system is verified by informative simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 A
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• pp.379-381
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• 1995

Many new electronic products are required to have a near unity power factor and a distortion free input current waveform. In this paper, a high performance single phase PWM AC/DC converter with input power factor correction is proposed. This proposed control strategy has many advantages which include one semiconduction switch, simplified control circuit, high performance features and continuous input current. The experimental results are included to verify the validity of this approach.