• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.320-321
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• 2019

철도 변전설비를 위한 싸이리스터 듀얼 컨버터 시스템은 기존의 다이오드 정류기로 구성된 변전설비 시스템과는 다르게 전동차 제동 시 발생하는 에너지를 안정적으로 계통(22.9kV)에 전달 가능하다. 본 논문에서는 싸이리스터 듀얼 컨버터의 실증 시험을 통해 기존에 제안된 제어기법을 검증하였다. 실증 시험의 경우 부산 호포 차량기지(전동차 6량 1편성) 시험용 전동차가 기동 시 싸이리스터 듀얼 컨버터에서는 882kW의 에너지를 공급하며, 제동 시 시험용 전동차에서 싸이리스터 듀얼 컨버터로 756kW의 에너지가 회생되는 것을 확인 및 분석하여 본 시스템의 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.28-30
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• 2020

본 논문에서는 위상천이 풀브릿지(PSFB) 컨버터에 적용할 수 있는 새로운 클램핑 회로를 제안한다. 제안하는 회로가 적용된 PSFB 컨버터는 정류기 다이오드의 전압 발진을 완전히 제거되면서도, 영전압 스위칭(ZVS)을 위한 전류를 보장하기 때문에 전도 손실과 스위칭 손실을 모두 개선하여 고효율을 달성할 수 있다. 뿐만 아니라, 출력 인덕터 부피와 듀티 손실 측면에서도 장점을 갖기 때문에 기존에 제안된 여러 클램핑 회로들에 비해서도 높은 효율과 높은 전력밀도를 갖는다. 제안된 회로의 타당성은 385V 입력, 270-420V 출력의 3.3kW 전기차 충전기 프로토타입으로 검증되었다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.4
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• pp.22-29
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• 2002

Usually, much harmonics are included and cause harmonic loss of motor, torque pulsation, electro-magnetic noise and shock etc. by switching function of inverter when drive induction motor variableness inside. It applied partial resonant Buck converter and three phase voltage type SPWM inverter circuit to induction motor driving system in this paper that see to solve such problem. Changed operation condition variously to do input current of circuit that propose sine-wave by unit power factor almost and capacitor supplied bringing back to life voltage by power supply arranging properly assistance diode and electric power switching. Power factor and efficiency improved as that minimize variation of input at power supply voltage polarity reverse by that add voltage reversal function. Also, by using output filter, reduced harmonic of output line to line voltage components, and introduce state space analysis and forecast operation of rectifier. Such all items confirmed validity through simulation and an experiment.

• Journal of the Korean Society of Marine Environment & Safety
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• v.23 no.6
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• pp.739-745
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• 2017

Many studies have been conducted to reduce environmental pollution by ships and reduce fuel consumption. As part of this effort, research on power conversion systems through DC distribution systems that link renewable energy with conventional power grids has been pursued as well. The diode rectifiers currently used include many lower harmonics in the input current of the load and distort supply voltage to lower the power quality of the whole system. This distortion of voltage waveforms causes the malfunctions of generators, load devices and inverter pole switching elements, resulting in a large number of switching losses. In this paper, a controller is presented to improve DC output waveforms, the input Power Factor and the THD of an AFE type PWM rectifier used for PLL. DC output voltage waveforms have been improved, and the input Power Factor can now be matched to the unit power factor. In addition, the THD of the input power supply has been proven by simulation to comply with the requirements of IEEE Std514-2014.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.544-545
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• 2010

전자식 안정기의 초기구동 시, 발생되는 입력단의 높은 돌입전류는 전자식 안정기 내의 전파정류다이오드 및 능동 역률보상회로의 파손원인이 되며, 제품의 신뢰성을 감소시키는 큰 요인으로 지목된다. 따라서 안정기의 입력에서 발생되는 돌입전류를 분석하고 제한하는 방법이 필요하다. 본 논문은 250W CDM(Ceramic Discharge Metal-halide) 램프용 DBI(Dual Buck Inverter) 구조의 전자식 안정기에서 초기 구동 시 높은 돌입전류가 발생되는 원인을 분석하고, 해결책을 제시하였다.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.4
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• pp.108-112
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• 2017

High-intensity-discharge lamps are widely utilized in outdoor and indoor lighting circumstances that need high luminance. In lighting applications for MHD lamps, the size of the lamp ballast circuit is an important factor and should be as small as possible. The electronic ballast for MHD lamps is superior to the electromagnetic(EM) ballast in that it saves energy, and has smaller volume and lighter weight. In this paper, highly efficient cost-effective and small sized electronic ballast for Metal Halide Lamp with high power factor using Digital Signal Processor are proposed. The proposed electronic ballast for MHD lamps combines a boost PFC converter with a half-bridge inverter, the algorithms of the power factor correction and ballast control were implemented using the TI's TMS320LF2406 CPU. Experimental results validate the ballast is also useful and reasonably suggested.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.139-140
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• 2013

본 논문에서는 철도차량용 25kW급 배터리 충전기 개발에 대해 설명한다. 열차 판넬 및 제어용 전원으로 사용되는 배터리 전원을 사용한다. 이를 상시 충전하기 위한 충전기는 기존에 보조전원장치의 3상 380V를 받아 강압 변압기를 사용하여 다이오드 정류 혹은 싸이리스터를 사용하였다. 하지만, 기존방식은 강압 변압기가 60Hz의 낮은 주파수로 인하여 사이즈 및 중량 증대를 유발 한다. 이에 본 논문에서는 가선의 높은 전압을 받아 공진형 컨버터를 사용하여 주파수를 높여 변압기의 사이즈 및 중량을 감소 하였으며, 안정적인 전원을 공급 하는 배터리 충전기를 개발 하였다. 이를 25kW급 시제품에 대한 시뮬레이션을 통해 입증 하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.267-270
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• 2014

This paper presents a CMOS interface circuit for vibration energy harvesting. The proposed circuit consists of an AC-DC converter and a DC-DC boost converter. The AC-DC converter rectifies the AC signals from vibration devices(PZT), and the DC-DC boost converter generates a boosted and regulated output at a predefined level. A full-wave rectifier using active diodes is used as the AC-DC converter for high efficiency, and a schottky diode type DC-DC boost converter is used for a simple control circuitry. A MPPT(Maximum Power Point Tracking) control is also employed to harvest the maximum power from the PZT. The proposed circuit has been designed in a 0.35um CMOS process. The chip area is $530um{\times}325um$. Simulation results shows that the maximum efficiencies of the AC-DC converter and DC-DC boost converter are 97.7% and 89.2%, respectively. The maximum efficiency of the entire system is 87.2%.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.412-415
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• 2015

This paper presents a MPPT(Maximum Power Point Tracking) control CMOS interface circuit for vibration energy harvesting. The proposed circuit consists of an AC-DC converter, MPPT Controller, DC-DC boost converter and PMU(Power Management Unit). The AC-DC converter rectifies the AC signals from vibration devices(PZT). MPPT controller is employed to harvest the maximum power from the PZT and increase efficiency of overall system. The DC-DC boost converter generates a boosted and regulated output at a predefined level and provides energy to load using PMU. A full-wave rectifier using active diodes is used as the AC-DC converter for high efficiency, and a schottky diode type DC-DC boost converter is used for a simple control circuitry. The proposed circuit has been designed in a 0.35um CMOS process. The chip area is $950um{\times}920um$.

• Journal of IKEEE
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• v.21 no.1
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• pp.73-76
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• 2017

SiC devices have drawn much attentions for its wide band gap material properties. Especially 4H-SiC Schottky barrier diode is widely used for its rapid switching speed and low forward voltage drop. However, the low reliability of Schottky barrier diode has many problems that Super Barrier Rectifier(SBR) was researched for alternative. makes 4H-SiC trench-type accumulation super barrier rectifier(TASBR) is analyzed and proposed in this paper. We could verified that forward voltage drop was improved 21.06% without severe degradation of reverse breakdown voltage and leakage current based on the results from 2-D numerical simulations. With this novel rectifier structure, we can expect application with less power loss.