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서철식(Cheol-Sik Seo),문종현(Jong-Hyun Moon),박재욱(Jae-Wook Park),김금수(Geum-Soo Kim),김동희(Dong-Hee Kim) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.6
본 논문에서는 무정전 전원시스템(UPS : Uninterruptible Power Supply)의 에너지 저장용으로 사용되는 납축전지를 최적의 상태로 유지, 관리하는 배터리관리시스템을 설계, 제작하고, 잔존용량을 추정하는 알고리즘을 제안한다. 제안된 배터리관리시스템은 배터리의 충ㆍ방전 전류를 제어하여 과방전 및 과충전으로부터 배터리를 보호하며, 충ㆍ방전 시 배터리 잔존용량(SOC)을 예측하여 배터리를 최적 상태로 유지하도록 하는 알고리즘이 적용된다. 또한 충ㆍ방전 시험기를 이용한 실험과 UPS에 장착한 후 성능 실험을 통해, 제작된 시스템의 성능 및 제안된 배터리 잔존용량 추정 알고리즘의 타당성을 입증한다. This paper presents the battery management system(BMS) for the optimum conditions of the lead-Acid battery in UPS. The proposed system control the currents and voltages of battery for optimum conditions to estimate the State Of Charge(SOC) in charge or discharge mode. It proved the performance and the algorithm for the estimation of SOC, through the experiments which using the charge and discharge tester and the field tests.
ZVS를 이용한 SEPP-LCC형 고주파 공진인버터의 특성해석에 관한 연구
서철식(Cheol-Sik Seo),김종해(Jong-Hae Kim),김동희(Dong-Hee Kim),노채균(Chae-Kyun Noh),이달해(Dal-Hae Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper has described about principle and form of proposed circuit made use of soft switching technology ZVS(Zero-Voltage-Switching) to reduce turn on and off loss at switching. also, the analysis of the proposed circuit has described by using normalized parameter and operating characteristics have been evaluated as to switching frequency and parameters. In addition, this paper proves the propriety of theoretical analysis in terms of the experiments. <br/>
배터리관리시스템(BMS)을 이용한 배터리 잔존수명(SOH) 추정 알고리즘에 관한 연구
서철식(Cheol-Sik Seo),문종현(Jong-Hyun Moon),박재욱(Jae-Wook Park),김금수(Geum-Soo Kim),김동희(Dong-Hee Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
This paper presents the battery management system(BMS) for the optimum conditions of the lead-Acid battery in UPS. The proposed system controls the over and under currents of battery for protecting and it was applied algorithm for optimum conditions to estimate the State Of Charge(SOC) and State Of Health(SOH) in charge or discharge mode. It approved the performance and the algorithm for the estimation of SOH, through the experiments which using the charge and discharge tester and the field tests.
단일 전력단 고주파 공진 인버터 링크형 DC-DC 컨버터의 특성해석에 관한 연구
원재선,박재욱,서철식,조규판,정도영,김동희,Won, Jae-Sun,Park, Jae-Wook,Seo, Cheol-Sik,Cho, Gyu-Pan,Jung, Do-Young,Kim, Dong-Hee 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.2
본 논문에서는 고역률을 가지고 영전압 스위칭으로 동작되는 새로운 단일 전력단 고주파 공진 인버터 링크형 DC-DC 컨버터 회로에 관하여 기술하고 있다. 제안된 토폴로지는 역률 교정기로써 하프 브리지형 부스트 컨버터와 하프 브리지 고주파 공진 컨버터를 단일 전력단으로 일체화 시켰다. 역률 보상용 부스트 컨버터의 부스트 인덕터 전류를 가변 스위칭 주파수와 일정 듀티비를 가지고 불연속 전류 모드(DCM)로 동작시킴으로써 부가적인 입력 전류제어기 없이 높은 입력 역률을 얻을 수 있다. 또 제안한 토폴로지의 이론해석을 무차원화 파라미터를 도입하여 범용성 있게 하여 회로 설계 전단계에서 필요한 특성값을 도식적으로 표현하다. 첨가해, 제안한 토폴로지의 상용화 가능성과 이론해석의 정당성을 입증하기 위해 스위칭 소자로 Power-MOSFET IRF 740을 제안회로 토폴로지의 스위칭 소자로 채용해 실험 장치를 구성하여 검토를 행하였다. 제안된 컨버터는 향후 통신용 DC/DC 컨버터의 전원장치, 방전등용 진원장치 등의 전원시스템에 유용히 사용될 것으로 사료된다. This paper presents a novel single-stage high frequency resonant inverter link type DC-DC converter using zero voltage switching with high power-factor. The proposed topology is integrated half-bridge boost rectifier as power factor corrector(PFC) and half-bridge high frequency resonant converter into a single-stage. The input stage of the half-bridge boost rectifier works in discontinuous conduction mode(DCM) with constant duty cycle and variable switching frequency. So that a boost converter makes the line current follow naturally the sinusoidal line voltage waveform. Simulation results have demonstrated the feasibility of the proposed high frequency resonant converter. Characteristics values based on characteristics analysis through circuit analysis is given as basis data in design procedure. Also, experimental results are presented to verify theoretical discussion. This proposed inverter will be able to be practically used as a power supply in various fields as induction heating applications, fluorescent lamp and DC-DC converter etc.
UPS용 배터리 최적화를 위한 배터리관리시스템에 관한 연구
문종현(Jong-Hyun Moon),서철식(Cheol-Sik Seo),박재욱(Jae-Wook Park),김금수(Geum-Soo Kim),김동희(Dong-Hee Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
This paper presents the battery management system(BMS) for the optimum conditions of the lead-Acid battery in UPS. The proposed system controls the over and under currents of battery for protecting and it was applied algorithm for optimum conditions to estimate the State Of Charge(SOC) in charge or discharge mode. It approved the performance and the algorithm for the estimation of SOC, through the experiments which using the charge and discharge tester and the field tests.
전류공급 Push-pull형 ZVS 고주파 발진전원장치
송진화(Jin-hwa Song),서철식(Cheol-sik Seo),이경호(Kyung-ho Lee),김종해(Jong-hae Kim),노채균(Chae-kyun Noh) 한국조명·전기설비학회 1999 한국조명·전기설비학회 학술대회논문집 Vol.1999 No.-
This paper proposes a current-fed type high frequency inverter using a soft switching technology Zero-Voltage-Switching to reduce turn on and off loss at the switching. The analysis of the proposed circuit was described by using normalized parameter and operating characteristics have been evaluated as to switching frequency and parameters. The theoretical results are in good agreement with the experimental ones. In the future the proposed circuit is considered to be useful for induction heating applications.
원제선(Jae-Sun Won),김종해(Jong-Hae Kim),서철식(Cheol-Sik Seo),배영호(Young-Ho Bae),김동희(Dong-Ree Kim),노채균(Chae-Gyun Ro) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
This paper has described about principle and form of proposed circuit made use of soft switching technology ZVS(Zero-Voltage-Switching) to reduce turn on and off loss at switching. Also, the analysis of the proposed circuit was described by using normalized parameter and operating characteristics has been evaluated as to switching frequency and parameters Based on the characteristics value, a method of the circuit design is proposed. The theoretical results are in good agreement with the experimental ones. The proposed circuit is consider-ated to be useful for induction heating and discharge lamp.