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인터리브드 소프트 스위칭 부스트 컨버터의 입출력 리플 분석
류동균(Dong-Kyun Ryu),정두용(Doo-Yong Jung),정용채(Yong-Chae Jung),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
In this paper, the input current and output voltage ripple of the soft switching interleaved boost converter was analyzed. Ripples of input current and output voltage with an interleaved method is analysed and as a result, the facts that it has lower ripple current than conventional interleaved method is verified. it means that a capacity of a main inductor can be reduced. Besides, a low capacitance of capacitor which means high lifetime and confidence can be used because of reducing ripples of output voltage.
LED TV를 위한 단일전력단 전류평형 다채널 LED 구동회로
류동균(Dong-Kyun Ryu),원충연(Chung-Yuen Won),한상규(Sang-Kyoo Han) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.6
A single-stage current-balancing multi-channel light-emitting diode (LED) driver is proposed in this study. The conventional LED driver system consists of two cascaded power conversion stages, i.e., an isolation DC/DC converter and LED driver. LED driver is usually implemented with the same number of expensive boost converters as those of LED channels to tightly control the current through each LED channel. Therefore, its overall system size is not only bulky, but the cost is rather high. By contrast, the proposed LED driver system is composed of a single power stage with the DC/DC converter and LED driver merged. Although the current balancing circuit of the proposed LED driver requires only passive devices instead of expensive boost converters, all currents through multi-channel LEDs can be well balanced. Therefore, the proposed LED driver features a small system size, improved efficiency, and low cost. To confirm the validity of the proposed driver, its operation and performance are verified on a prototype for a 46"" LED TV.
장수진(Su-Jin Jang),류동균(Dong-Kyun Ryu),원충연(Chung-Yuen Won),이진국(Jin-Kuk Lee),배기훈(Kee-Hun Bae),김수석(Soo-Suck Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A synchronous generator is equipped with an automatic voltage regulator(AVR), which is responsible for keeping the output voltage constant under normal operating conditions at various levels<br/> The output voltage of Synchronous Generator is regulated constantly by field voltage control in excitation system.<br/> High frequency PWM converter (Buck converter) type excitation system for synchronous generator that can sustain proper output voltage level even at the fault condition happened.<br/> The proper operation of the proposed excitation system was verified through the simulations and the experiments.
전류제어형 PWM컨버터를 이용한 동기발전기용 여자시스템에 관한 연구
장수진(Su-Jin Jang),류동균(Dong-Kyun Ryu),서민성(Min-Sung Seo),김준호(Jun-Ho Kim),원충연(Chung-Yuen Won),배기훈(Kee-Hun Bae) 한국조명·전기설비학회 2002 한국조명·전기설비학회 학술대회논문집 Vol.2002 No.-
The output voltage of Synchronous Generator is regulated constantly by field current control in excitation system. A synchronous generator is equipped with an automatic voltage regulator(AVR), which is responsible for keeping the constant output voltage under normal operating conditions about various levels. High frequency PWM converter (Current Mode Control Buck converter) type excitation system for synchronous generator is able to sustain output voltage level properly when the fault condition happened. This paper deals with the design and evaluation of the excitation system controller for a synchronous generator to improve the steady state and transient stability, The simulation and experimental results show that the proposed excitation system is improve the response time by the AVR(automatic voltage regulator) of 50kW synchronous generator that is applied the current mode control excitation system.