• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.313-314
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• 2013

전기자동차용 급속충전기는 배터리의 SOC(State of Charge)가 낮은 경우 전류제어를 통해 배터리를 충전해 준다. 하지만 배터리가 충전되어 SOC가 최대치인 100%에 가까워졌을 경우 과충전을 방지하기 위해 전압제어로 배터리를 충전해 주는데 충전기가 전류제어에서 전압제어로 바뀌면서 과도상태가 발생하게 된다. 본 논문에서는 배터리 충전을 위한 전류제어에서 과충전 방지를 위한 전압제어로 과도상태 없이 변환될 수 있도록 제한적 2중루프 제어를 통한 급속충전기의 과충전 방지 제어 알고리즘을 제안한다. 제안된 알고리즘은 시뮬레이션을 통해 검증하였고 차량용 50kW 급속충전기에 적용되어 제주도 스마트 그리드 실증센터에 설치되었다.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.139-140
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• 2012

현재의 배터리 충전기는 보편적으로 CC-CV 충전방법을 사용하면서 배터리의 과충전에 대해 안정적인 제어를 한다. 하지만 충전말기의 CV 모드는 배터리 충전이 느려 시간이 많이 낭비된다. 본 논문은 CC 단일형 충전을 하면서 과충전의 우려는 DFT를 사용하여 배터리 내부전압을 추정하면서 내부 알고리즘에 의해 배터리 내부전압이 설정값이 되었을 경우 충전을 종료하면서 CV 충전으로 낭비되는 시간을 줄인다. 이를 시뮬레이션을 통하여 그 타당성을 확인한다.

• Journal of Satellite, Information and Communications
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• v.12 no.4
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• pp.95-99
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• 2017

The lifetime of a battery that supplies all the power required by a satellite in the eclipse is directly related to the lifetime of the satellite. Because the lifetime of the battery is influenced by the charging method of the battery, the power control unit that controls the charging of the battery should be designed in consideration of battery life. The battery charging is performed by controlling the charge current in the power control unit generated from the solar cell in the daytime. In order to prevent overcharge of the battery and for considering frequency of eclipse in each season, parameters related battery charging should be designed differently according to the season and to prevent over-current charging and over-voltage charging during charging, charge current is controlled by monitoring battery charge / discharge status, charge current amount, battery voltage, battery capacity, battery temperature and battery cell voltage. In satellite, tapering method is used to control charge current by reflecting each condition. In this paper, design battery charging algorithm of satellite power control unit using tapering charging method. convert the designed algorithm into a code that can be uploaded to satellites and verify the operation through testing in the established satellite environment.

• The Transactions of the Korean Institute of Power Electronics
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• v.3 no.4
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• pp.273-279
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• 1998

In this paper, the proposed charging system consists of step charging mode and time-sharing equalization charging mode. As $\Delta$V=O point is detected, the proposed cut-off method will selectively cut off the only battery to reach the $\Delta$V=O point, preventing serial-connected batteries from undercharging. In the start of each step, the equalization charging mode is performed to reduce the capacity difference among the batteries. Though it is added to simple circuit for selective cut-off, comparing with recently used step-charging method, this system can improve the life cycle of battery and charging efficiency, and be also very effective for preventing the batteries from overcharging and undercharging.

• Journal of the Society of Disaster Information
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• v.16 no.2
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• pp.383-391
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• 2020

Purpose: To identify internal self ignition and ignition caused by external flames in energy storage rooms, and to analyze the difference between ignition due to overheating and ignition caused by external heat sources. Method: membrane melting point measurement, battery external hydrothermal experiment, battery overcharge experiment, comparative analysis of electrode plate during combustion by overcharge and external heat, overcharge combustion characteristics, external hydrothermal fire combustion characteristics, 3.4 (electrode plate comparison) / 3.5 (overcharge) /3.6 (external sequence) analysis experiment. Result: Since the temperature difference was very different depending on the position of the sensor until the fire occurred, it is judged that two temperature sensors per module are not enough to prevent the fire through temperature control in advance. Conclusion: The short circuit acts as an ignition source and ignites the mixed gas, causing a gas explosion. The electrode breaks finely due to the explosion pressure, and the powder-like lithium oxide is sparked like a firecracker by the flame reaction.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.349-350
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• 2010

본 논문에서는 리튬이온 배터리 충전알고리즘 중에서, 기존의 정전류/정전압충전(CC/CV)과 부스트충전(Boostcharging)을 비교 분석한다. 또한 기존의 정전류/정전압 충전방식에 비해 부스트충전이 갖는 장점과 부스트충전알고리즘의 근거를 제시하고 부스트충전 알고리즘을 시뮬레이션을 통해 구현한다. PSIM 6.0 과 C Programming을 이용하여 시뮬레이션 모델을 구축하였고 구성된 시뮬레이션 결과를 통해 타당성을 검증한다.

• LP가스
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• s.72
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• pp.6-6
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• 2001

최근 우리 협회는 LPG충전소 과충전방지장치의 설치시기를 조정해줄 것을 가스안전공사에 건의했다.

• KIPS Transactions on Computer and Communication Systems
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• v.8 no.12
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• pp.277-286
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• 2019

The Unmanned Aerial Vehicle (UAV) is one of the most precious inventions of Internet of things (IOT). UAV faces the necessity to charge battery or replace battery from the charging stations during or between services. We propose scheduling algorithms for drone power charging (SADPC). The basic idea of algorithm is considering both a deadline (for increasing deadline miss ratio) and a charging time (for decreasing waiting time) to decide priority on charging station among drones. Our simulation results show that our power charging algorithm for drones are efficient in terms of the deadline miss ratio as well as the waiting time in general in compare to other conventional algorithms (EDF or SJF). Also, we can choose proper algorithms for battery charge scheduling and charge ready battery allocation according to system parameters and user requirements based on our simulation.

• 전기의세계
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• v.39 no.10
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• pp.28-36
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• 1990

태양광발전 시스템에서 축전지는 일조시간에 태양 전지에 의해 충전된 전력을 일몰 후와 같이 태양전지로 부터의 출력이 없을때나 흐린날, 우천시와 같이 태양 전지의 출력이 부족할 때 방전하여 부하에 전력을 공급하게 된다. 이와같이 축전지는 태양 광발전 시스템이라는 특별한 용도에 사용되기 때문에 일반적인 용도와는 달리 매우 가혹한 사용 조건하에서 가동된다. 즉, 축전지의 충전량은 기후 변화에 의해서 좌우되므로 과충전, 부족충전, 과방전이 진행되면 축전지의 노화 즉, 용량 감소는 급격히 일어나게 된다. 물론 최적의 충전 상태를 유지하기 위해서 충전기를 개량하거나, 부조일을 감안하면 축전지의 용량을 설계하거나, 디젤 보조발전기를 사용하여 일사량이 적은 경우에 충전 전기량을 보충하는 등 여러가지 개선책이 있지만, 불규칙적이며 가혹한 사용조건은 자연 현상에 의한 것이므로 근본적인 해결책은 될 수가 없다.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.2
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• pp.255-260
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• 2021

The importance of electric vehicles is gradually increasing due to the recent depletion of fossil fuels. In order to use an electric vehicle, the battery built into the vehicle must be frequently charged. Electric vehicles has very good performance in terms of noise and vibration. However, due to the limitations of the battery, the mileage is considerably shorter than that of an internal combustion engine vehicle once it is charged, and the battery charging time is relatively long compared to the refueling time. There are two types of charging methods for electric vehicle batteries: plug-in and wireless charging. In this paper, we introduced the wireless charging technology for electric vehicles and the current state of technology development and standards in major countries.