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이종규(Jong-Kue Lee),류희삼(Hee-Sahm Ryu) 한국조명·전기설비학회 2002 한국조명·전기설비학회 학술대회논문집 Vol.2002 No.-
This paper is an experimental research of the design of a cell battery charger using switching methods. The developed charger in this paper can do both the equalizing current charge and floating charge. Also, it is easily transferable. Power MOS FET was used for the full bridge converter of the charger, and ZVS was applied for the switching method of the converter. Also, Customized IC was used for the control circuit in order to simplify ZVS mode. The setting current and floating current used for the charger were designed by using OP AMP. Based on the process provided by the current research, a sample converter with the power rating of 5KVA was developed and is field-testing to improve its validity and stability.
이종규(Jong-Kue Lee),유태제(Tae-Jae Yoo) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
The propose of this research was to discuss the system that operated Ultra sonic transducer of Pelzo electric ceramics type. The structure of controller was made up of digital signal part, drive and feedback circuit, and half bridge inverter. Digital signal part was designed to gain the stable oscillation frequency by making consideration of pointed resonance bandwidth. We tried to control inverter by forward feedback condition because BLT based on the flexibility of elements such as temperature and load condition. In addition, transducer was operated as inverter in order to enhance its power efficiency. In this experiment, output voltage waveform and current waveform have been observed by using BLT.
이종규(Jong-Kue Lee),송필재(Pil-Jae Song) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
This paper presents the methods of designing the control circuits for a Class D amplifier to have a peak performance. The proposed approach is based on the three functional components - a carrier generator, a feedback circuit and a dead-time circuit. First the analog signal is applied to the controller, which outputs the 3 level PWM waveform. The controller used for this experiment is made of the operational amplifier and the logic circuit. The experimental results show that the control circuit performs with satisfaction and its output is proportional to input audio signal, providing a satisfactory 3 level PWM pattern. From this design methodology, by implementing a proposed control circuit we can achieve the efficient Class D amplifier using the half-bridge, full-bridge or push-pull topology at the output stage.
이종규(Jong-kue Lee),윤흥식(Heung-Sik Yoon) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
The main purpose of this study is to develop current fed power supply for LED lighting that is controlled depending on control of current. LED is a device with a little variation of load when its operation is normal. For this study, a structure of current fed circuit for the LED power supply is proposed with the consideration of electric features of LED. IGBT, a switching device is used to generate constant current with control of on-off. In addition, the use IGBT was helpful to reduce switching loss as well as to simplify the circuits. For the experiment, a current fed power supply is designed and tested its characteristics of control of current under the condition of four 96W LED in parallel connection. As a result, its control of current is identified under this experimental circumstance.
송필재(Pil-Jae Song),이종규(Jong-Kue Lee) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
Various cameras that is included digitial camera and portable individual terminal are supplied rapidly. Therefore, is trying for quality sophistication of camera that buy each camera manufacture. However, is selecting sample test way because there is no correct lens measurement method in mass production. This paper presents method to measure performance of lens to improve performance of camera. This paper presents method to measure performance of lens to improve performance of camera. As automation public prosecutor lens quality is correct and did quantification so that done measuring is possible. And processing designed possible MTF with high speed.