• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.636-640
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• 2000

A novel integrated battery charger/discharger converter for a standardized battery module is proposed. Instead of using separate charger and discharger converters. it integrates these two converters into a single converter in order to minimize the size. the integrated charger/discharger converter not only regulates the solar array output power including the peak power tracking capability but also controls the battery charging/discharging current depending on the solar array output power and the load power. In addition it offers a regulated bus voltage which simplifies the power distribution/conversion for the pay load.

• 조명전기설비학회논문지
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• 제26권11호
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• pp.62-74
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• 2012

This paper proposes a new secondary battery charger/discharger available for zero voltage discharge which is used for test equipments and formation process. The proposed system is a switching type converter, and thus the system is high efficiency and more compact as compared with linear type charger/discharger. Conventional switching type charger/discharger can not discharge secondary batteries to zero voltage because of voltage drops in the switching elements and long distributing line(typically 10m). However, the proposed system is able to discharge the battery to zero voltage in constant current mode regardless of the voltage drops. In this paper, we analyze the proposed charger/discharger and the validity of the system is verified by simulation and experiment.

• 전력전자학회논문지
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• 제5권6호
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• pp.537-543
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• 2000

표준 배터리 모듈 시스템을 위한 새로운 배터라 충.방전기를 제안한다. 전체 시스템의 크기를 줄이기 위해 충전기와 방전기의 회로가 하나의 컨버터로 구현되었으며, 최대 전력 추적을 포함한 태양전지 출략전압 제어와 태양 전지 출력과 부하 전력에 따른 배터리 충.방전 전류 제어를 동시에 수행한다. 또한, 제안된 컨버터는 부하의 전략 공급을 간단히 할 수 있는 일성 전압 버스(regulated bus)를 제공한다. 제안된 컨버터는 특성상 DCM으로 동작하므로 전듀의 첨두지가 크므로 고전력 시스템에서는 여러 개의 모듈로 사용되어야 한다.

• 전력전자학회논문지
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• 제22권6호
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• pp.535-542
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• 2017

This paper proposes a simple 3-level interleaved charger-discharger for the uninterruptible power supply (UPS) with various combinations of battery cells. The proposed converter not only improves charging and discharging efficiency, but also reduces the physical volume and the cost. Furthermore, the converter also offers the capability of the neutral point voltage, so that more stable operation can be obtained. In addition, the proposed converter significantly reduces the ripple current of the battery inductor, thereby providing an expected life extension of the battery. Experimental results for a 300kVA UPS prototype verify the validity of the proposed converter. The proposed charger-discharger is suitable for UPSs and energy storage systems (ESSs) with wide input battery voltage ranges.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.773-776
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• 2002

The battery charger of spacecraft has two different modes of operation respectively. One is the bus voltage regulation mode and the other is the charge current regulation mode. And also the battery discharger provide the power during eclipse mode of spacecraft. In this study, a test model of the battery charger and discharger using hi-directional converter are designed and analyzed. These Battery Charger and Discharger is introduced the modular converter method that can be added the converter modules according to the load variation.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.472-475
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• 2000

An balanced tapped inductors using RPPT (Regulated Peak Power Tracking) system is proposed. In the series/parallel PPT system battery charger and discharger are operating complementary. So they both can be combined into a single hardware block. Battery charger and dis-charger share same magnetic cores thus can be reduced core weights.

• 전자공학회논문지B
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• 제33B권3호
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• pp.193-201
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• 1996

The space power system for communication satellite which employs the direct energy transfer (DET) method consists of solar array, battry, shunt regulator, charger/discharger and power control unit (PCU). In this paper, the development of the DET power system charger/discharger unit and a microprocessor based PCU is developed for simplicity and flexiblity in the modificatin of control algorithm. A 28V bus voltage, 400W power rting power simulator is built and tested to verify the operation of the simulator at each mode and the stability of mode transition is analyzed.

• 전자공학회논문지B
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• 제32B권6호
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• pp.932-942
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• 1995

A spacecraft power system can be divided into two types : DET system(Direct Energy Transfer system) and PPT system(Peak Power Tracking system). In a DET system employing the regulated bus voltage control method, the battery charger and discharger are widely used for the bus voltage regulation. The battery charger has two different modes of operation. One is the bus voltage regulation mode and the other is the charge current regulation mode. The battery discharger is employed to provide the power when the spacecraft is in the earth's shadow or the sun is eclipsed. The operating mode, charging or discharging, is selected by a power control circuit. In this paper, small-signal dynamic characteristics of battery charging and discharging system are analyzed to facilitate design of control loop for optimum performance. Control loop designs in various operating modes are discussed. Anaylses are verified through experiments.

• 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.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 추계학술대회 초록집
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• pp.50.1-50.1
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• 2011

전력수요가 적을 때 잉여전력을 저장하고 전력수요가 많은 시간대나 전기료가 비싼 시간대에 저장된 전력을 사용함으로서 전력의 활용 효율을 높이고, 전력공급 시스템을 안정화하기 위해 에너지저장시스템의 연구가 최근에 활발히 진행되고 있다. 또한 공장, 산업용빌딩이나 병원 등 고르고 안정적인 전력의 수요는 늘어나고 있으며, 화석 연료 고갈 문제로 인한 신재생에너지 발전의 중요성도 대두되고 있다. 본 논문에서는 무정전 전원장치, 태양광발전시스템, 에너지 저장 시스템을 모두 통합하였다. 제안한 시스템은 3상 인버터, 부스트 컨버터, 양방향 컨버터, 사이리스터 스위치로 구성된다. 인버터는 계통과 연계되거나 UPS 동작 시 AC 전력을 만든다. 부스트 컨버터는 태양광 패널과 연결되어 MPPT 제어를 수행한다. 양방향 컨버터는 잉여전력을 배터리에 저장을 하고, 전력이 부족할 시에는 배터리의 전력을 방전한다. 사이리스터 스위치는 정전 시 계통과 부하를 끊어주는 역할을 한다. 본 논문에서는 15kW급 시스템으로 구현하여 검증하였다.