• 한국자동차공학회논문집
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• 제11권6호
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• pp.21-29
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• 2003

Boosting of engine power by using Turbo- or Super-charger is a solution to comply with $CO_2$-regulation in Europe. Turbo-charger is now playing a major role in the field of charging system thank to its technical advantages such as no demand of operation power from engine. A mechanically driven Super-charger, however, is now popular due to quick speed response to change of the driving mode-high engine torque even at low engine speed. Since Super-charger needs operation power from engine, it is difficult to improve its relatively higher fuel consumption than that of Turbo-charger. This negative point is still an obstacle to the wide use of Super-charger. This study aims to develop power control concept to achieve the minimization of operation power when it is not necessary to charge at idling or part load driving condition. A screw type Super-charger was modified in design partially and adapted an internal bypass valve and a bypass tube to control charging pressure at part load. The various control concepts show a possibility to reduce operation power of Super-charger and result in improvement of fuel consumption.

• 대한임베디드공학회논문지
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• 제11권5호
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• pp.305-312
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• 2016

Modern embedded systems are typically operated by the rechargeable batteries in our daily life. Since charge of batteries is considered as an time consuming task, there have been extensive efforts to manage the charge time from the perspective of materials, circuits, and systems. Estimation of battery charge time is one of the essential information to design the charge circuitry. A compact macro model for the constant-current and constant-voltage charge protocol was recently introduced, which gives us a quick estimation of charge time with similar shape to the famous Peukert's law for discharge time estimation. The CC-CV charging protocol is widely used for Lithium-based batteries and Lead-acid batteries. In this paper, we characterize the lead-acid battery by measurement to extract the model coefficients, which was not covered by the previous studies. By our proposed model, the key coefficient Kcc results in 1.18-1.31, which is little bit higher than that of Lithium batteries. The accuracy of our model is within the range of ${\pm}10%$ error, which is compatible with the other studies such as Peukert's law.

• 한국전자통신학회논문지
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• 제14권1호
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• pp.161-168
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• 2019

오늘날 탄소 및 배기가스 저감을 위한 해결책으로 전기자동차의 개발 및 보급이 증가하고 있다. 국내에서는 환경부 주관으로 전기 자동차의 보급과 충전기의 확충이 해마다 빠른 속도로 증가하고 있다. 본 논문에서는 전기 자동차 충전기의 보급과정에서 필연적으로 나타나는 고장에 관한 문제를 해결하기 위하여 전기 자동차 및 충전기 양쪽의 충전관련 고장에 대한 신속한 점검을 가능하게 하는 휴대용 스마트 시험 기술에 대하여 연구하였다. 전기 자동차 및 충전기 간의 통신 프로토콜의 정상동작을 검증하기 위해 하드웨어 모듈과 소프트웨어를 구성하였으며, V2G 기술까지 고려된 국제 표준규격에 기반을 둔 휴대용 시험기를 개발하여 시험 평가하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 학술대회 논문집 전문대학교육위원
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• pp.108-111
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• 2007

A novel voltage sag compensator with hi-directional DC/DC converter of Electric double layer capacitor is proposed. Recently, the double-layer capacitor which is drawn attention as a new energy storage element has a lot of advantage such as no maintenance, long lifetime and quick charge/discharge characteristics with large current. This DC/DC converter is used to control the charging current to the double-layer capacitor and also used to keep the DC link voltage constant for discharge of the double-layer capacitor. Therefore, the proposed DC/DC converter has the high-efficiency controller, dynamic compensator of voltage sag is driven by this converter. Finally, experimental results show the validity of the control scheme and the ability of the dynamic voltage compensator.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.339-341
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• 2006

The regenerating energy of the servo system is mostly consumed as heats through the regenerating resistors. For the response of the servo system to be more improved, the paper proposes the boost inverter using the regenerating energy, The proposed boost inverter has the additional capacitor installed on the DC-link circuit for charging the regenerating energy from the load. To get the better response of the servo system, the charged regenerating energy can be shortly re-applied to the output side as the finite impulse voltage, which can be controlled from information of reference voltages and feedbacked currents. It is verified by PSIM simulator that the response characteristics of the servo system using the proposed boost inventer is improved, comparing to that using the general inverter.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 하계학술대회 논문집
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• pp.324-325
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• 2010

전기자동차 충전 인프라 구축은 스마트 그리드사업과 연계하여 스마트 트랜스포테이션(Smart Transportation)이라는 새로운 사업모델로 활발히 추진되고 있다. 충전인프라 구축은 전력망, 운영시스템, 과금 및 정산 시스템과 급속충전기로 구성된다. 스마트 트랜스포테이션 제주 실증단지 구축사업(한전 컨소시움)에 설치 운영 될 급속충전기의 HMI(Human Machine Interface), BMS 인터페이스, 운영알고리즘에 대하여 소개하고자 한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 전력전자학술대회 논문집
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• pp.291-292
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• 2013

본 논문에서는 전기자동차 급속충전시스템용 3상 전압형컨버터의 스위칭손실저감 변조기법을 제안한다. 제안된 변조기법은 SVPWM 기법의 기존 5단계 스위칭시퀀스를 간략화시킴으로 스위칭절환이 감소하고 스위칭손실이 저감됨을 제시하며 이에 대한 유효성을 시뮬레이션을 통해 검증한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 추계학술대회 논문집
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• pp.195-196
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• 2015

본 논문에서는 전기자동차 긴급구난용 급속충전 병렬능동클램프 고효율 절연형 DC/DC 컨버터를 제안한다. ZVS 턴온동작하여 스위칭손실을 저감하고, 능동클램프 스위칭소자에 대한 스위칭주파수와 전류를 저감시킬 수 있도록 토폴로지의 개선과 함께 제어기법을 도입한 20kW급 전기자동차 급속충전 전력변환시스템을 제안하고, 이에 대한 유효성을 시뮬레이션 및 실험을 통해 검증한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 추계학술대회
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• pp.211-212
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• 2010

DC 배전망에서 전기자동차 급속 충전 시스템은 대용량 전력 변환기를 통해 AC 배전망의 전압을 DC 전압으로 변환하여 DC 입력형 급속 충전기에 배전한다. DC 입력형 급속 충전기는 인버터기능이 제거됨으로 구조를 단순화하고 소형경량화 할 수 있다. 또한 충전소 내에 설치된 다수의 충전기 각각이 수행하던 전류 고조파 저감, 역률 향상, 양방향 전력 제어와 같은 기능들을 하나의 장치가 일괄 수행함으로서 충전소 인프라 단위의 신뢰성을 높일 수 있다. 본 논문은 DC 배전망에서의 전기 자동차 급속 충전 시스템의 특징에 대해서 설명하고자 한다.

• 한국재료학회지
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• 제31권2호
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• pp.75-83
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• 2021

To cope with automobile exhaust gas regulations, ISG (Idling Stop & Go) and charging control systems are applied to HEVs (Hybrid Electric Vehicle) for the purpose of improving fuel economy. These systems require quick charge/discharge performance at high current. To satisfy this characteristic, improvement of the positive electrode plate is studied to improve the charge/discharge process and performance of AGM(Absorbent Glass Mat) lead-acid batteries applied to ISG automotive systems. The bonding between grid and A.M (Active Material) can be improved by applying the Sand-Blasting method to provide roughness to the surface of the positive grid. When the Sand-Blasting method is applied with conditions of ball speed 1,000 rpm and conveyor speed 5 M/min, ideal bonding is achieved between grid and A.M. The positive plate of each condition is applied to the AGM LAB (Absorbent Glass Mat Lead Acid Battery); then, the performance and ISG life characteristics are tested by the vehicle battery test method. In CCA, which evaluates the starting performance at -18 ℃ and 30 ℃ with high current, the advanced AGM LAB improves about 25 %. At 0 ℃ CA (Charge Acceptance), the initial charging current of the advanced AGM LAB increases about 25 %. Improving the bonding between the grid and A.M. by roughening the grid surface improves the flow of current and lowers the resistance, which is considered to have a significant effect on the high current charging/discharging area. In a Standard of Battery Association of Japan (SBA) S0101 test, after 300 A discharge, the voltage of the advanced AGM LAB with the Sand-Blasting method grid was 0.059 V higher than that of untreated grid. As the cycle progresses, the gap widens to 0.13 V at the point of 10,800 cycles. As the bonding between grid and A.M. increases through the Sand Blasting method, the slope of the discharge voltage declines gradually as the cycle progresses, showing excellent battery life characteristics. It is believed that system will exhibit excellent characteristics in the vehicle environment of the ISG system, in which charge/discharge occurs over a short time.