• 전력전자학회논문지
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• 제14권5호
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• pp.387-396
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• 2009

리튬전지는 생산과정에서의 핵심인 화성공정에 의해 수명 및 성능이 크게 좌우되며, 화성공정을 처리하기 위해서 충방전 시스템이 필수적으로 요구되고 있다. 리튬전지 충방전 시스템의 특성을 해석하기 위해 일반적인 방법으로 시뮬레이션하면 충전동작과 방전동작에 엄청난 시간이 소요되고 메모리 용량의 한계로 인해 범용 PC로는 시뮬레이션이 어렵다. 본 논문에서는 리튬전지를 저항-커패시터 직렬회로로 모델링하였으며 상태공간평균의 개념을 적용하여 리튬전지 충방전 시스템을 해석하고 시뮬레이션하였다. Simplorer를 사용하여 시뮬레이션을 수행한 결과 시뮬레이션 시간이 단축되어 범용 PC로도 3시간 내에 시뮬레이션이 가능해졌으며, 리튬전지 충방전 시스템의 정전류/정전압 충전 특성 및 정전류 방전 특성과 충방전 소요시간을 예측할 수 있었다. 또한 충방전 시스템을 구성하고 실험하여 리튬전지를 저항-커패시터 직렬회로로 등가화한 모델링의 타당성과 상태공간평균의 개념을 사용하여 해석하고 시뮬레이션한 방법의 유용성을 입증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.433-437
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• 1998

Equalize SOC of the cell which effect on the charge.discharge ability and the efficiency of the battery, through the charge.discharge characteristic test of the battery source, and develope the high efficiency charge.discharge system in the series HEV have a constant engine-generator output. For this, in this paper, establish the electrical model and the condition of high efficiency charge.discharge, and proposed the improvement method of charge.discharge characteristic in the battery source that consist of twenty Ni-MH cells connected serial/parallel

• Journal of applied mathematics & informatics
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• 제39권5_6호
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• pp.805-811
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• 2021

Currently, batteries use commonly as energy sources for mobile electric devices. Due to the high density of energy, the energy storage state of a battery is very important information. To know the battery's energy storage state, it is necessary to find out the open state voltage of the battery. The open state voltage calculates with a mathematical model, but the computation of the real time state is complicated and requires many calculations. Therefore, the state observer designs to estimate in real time the battery open-circuit voltage as disturbance including model error. Using the estimated open voltage and applying it to the state estimation algorithm, we can estimate the charge. In this study, we first estimate the open-circuit voltage and design an estimation algorithm for estimating the state of battery charge. This includes errors in the system model and has a robust characteristic to noise. It is possible to increase the precision of the charge state estimation.

• 조명전기설비학회논문지
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• 제29권9호
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• pp.96-102
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• 2015

This paper presents battery charging method using 3-phase AC-DC boost converter. General battery charging method is that charging the battery voltage to the reference voltage according to the constant current(CC) control, when it reaches the reference voltage, charging the battery fully according to the constant voltage(CV) control. However, battery chaging time is increased because of the battery impedance, constant current charging section which shoud take the large amount of charge is narrow, and constant voltage charging section which can generate insufficient charge is widen. To improve this problem, we proposes the method to reduce the charging time according to the SOC(State of Charge) estimation using battery impedance.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 추계학술대회 논문집
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• pp.25-26
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• 2015

Inductive Power Transfer (IPT) method becomes more and more popular for the Electric Vehicle (EV) battery charger due to its convenience and safety in comparison with plugged-in charger. In recent years, Lithium batteries are increasingly used in EVs and Constant Current/Constant Voltage (CC/CV) charge needs to be adopted for the high efficiency charge. However, it is not easy to design the IPT Battery Charger which can charge the battery with CC/CV charge under the wide range of load variation due to the wide range of variation in its operating frequency. This paper propose a new design and control method which makes it possible to implement the CC/CV mode charge with minimum frequency variation (less than 1kHz) during all over the charge process. A 6.6kW prototype charge has been implemented and 96.1% efficiency was achieved with 20cm air gap between the coils.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.554-559
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• 1998

Equalizing the state of charge of cell that affects the charge/discharge quality and efficiency of the battery through the charge/discharge characteristic experiments of battery source, we develope the high efficiency charge/discharge system which would be used in serial HEV with the constant engine-generator output. For this, establishes the electrical model of Ni-MH battery appropriate to the high efficiency charge/discharge conditions. There is no model of Ni-MH cell, so we used Ni-Cd model and obtain the Ni-MH model through the experiment. A reason that each cell has the same charge/discharge property for applying the cell model to serial/parallel connected battery source extensively is needed. Therefore, in this paper, propose the Ni-MH charger/discharger has the equalization charging function and selectable cut-off function.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 춘계학술대회 논문집
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• pp.749-750
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• 2010

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.585-586
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• 2010

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 전력전자학술대회 논문집
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• pp.401-402
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• 2015

In this paper a direct cell-to-cell charge balancing circuit which can transfer the charge from any cell to any cell in the battery string is introduced. In the proposed topology the energy in the high voltage cell is transferred to the low voltage cell through the simple operation of a dc-dc converter to get fast equalization. Furthermore, the charge equalization can be performed regardless of the battery module operation whether it is being charged, discharged or relaxed. The monitoring circuit composed of a DSP and a battery monitoring IC is designed to monitor the cell voltage and protect the battery. In order to demonstrate the advantages of the proposed topology, a prototype circuit was designed and applied to 12 Lithium-Ion battery module. It has been verified with the experiments that the charge equalization time of the proposed method was shortest compared with those of other methods.

• 한국위성정보통신학회논문지
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• 제12권4호
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• pp.95-99
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• 2017

식 구간에서 인공위성이 필요로 하는 모든 전력을 공급하는 배터리의 수명은 인공위성의 수명과 직결된다. 배터리의 수명은 배터리 충전 방식에 의해 영향을 받으므로, 배터리 충전을 제어하는 전력제어유닛은 배터리 수명을 고려하여 설계되어야 한다. 배터리 충전은 낮 구간에서 태양전지로부터 생성된 전력을 전력제어유닛의 충전 전류 제어를 통해 이루어진다. 계절마다 다른 식 구간의 빈도를 고려하고 배터리 과충전 방지를 위하여 배터리 충전관련 변수들은 계절에 따라 각각 다르게 설계되어야 한다. 또한 충전 시 과전류 충전과 과전압 충전을 방지하기 위해 배터리 충/방전 상태, 충전전류 양, 배터리 전압, 배터리 용량, 배터리 온도, 배터리 셀 전압 등을 모니터링 하여 충전 전류를 제어한다. 인공위성에서는 각 조건을 반영하여 충전 전류를 제어하는 tapering 방식을 사용한다. 본 논문에서는 tapering 충전 방식을 적용한 인공위성 전력제어유닛의 배터리 충전 알고리즘을 설계한다. 설계된 알고리즘을 위성에 업로드 할 수 있는 코드로 변환하고 구축된 위성환경에서의 시험을 통해 동작을 검증한다.