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A Study on a New Hybrid Induction Heating System for Laser Printer
채영민(Young-Min Chae),김진하(Jin-Ha Kim),권중기(Joong-Gi Kwon),한상용(Sang-Yong Han),성환호(Hwan-Ho Sung) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Recently, the demand for the development of high quality and high speed laser printer and efficient power utilizations are required. Among complicate electro-mechanic devices in laser printer, the toner fusing unit consumes above 90[%] of all electrical energy needed for printing devices. Therefore, the development of more effective energy-saving toner fusing process becomes a significant task of much great demand. Generally, there are several way to implement fusing unit, among them this paper present a new hybrid induction heating method. The proposed induction heating method enables to increase coupling coefficient between heating coil and heat roller also to increase total energy transfer efficiency. Therefore the proposed IH inverter system provide very fast W.U.T.(Warm UP Time), also high efficiency. Through experimental result, the proposed control system is verified.
사이리스터 정류기형 아크용접기의 디지털 제어기 구현에 관한 연구
우동학(Dong-Hak Woo),구자열(Ja-Youl Goo),채영민(Young-Min Chae),최규하(Gyu-Ha Choe),안기은(Ki-Eun Ahn),한광수(Kwang-Su Han) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
With the development of semicon-ductor devices, adaptation of microcontroller prevails in industrial area. But in arc welding industry, there has not been much progress in adoption of microcontroller technology. Therefore, this paper shows the application of digital control technology to welding machine.<br/> This paper presents the design of micro-controller that is appropriate for three phase CO₂gas metal arc welding machine By using microcontroller in CO₂ gas metal arc welding machine, the overall cost can be reduced compared to analog type one. Also TMS370C850 microprocessor is used as overall microcontroller for the arc welding machine.
능동전력필터 기능을 갖는 병렬형 무정전 전원 시스템의 해석 및 설계
채영민,이광주,최규하 건국대학교 산업기술연구원 1995 건국기술연구논문지 Vol.20 No.-
Conventional UPS(Uninterruptible Power Supply) systems offer load voltage continuity and are standing by power outage when the utility power is maintained normal. It has a low efficiency because it operate at power failure. Harmonic currents induced by switching supplies badly distort the output waveform of power sources. Utility power quality has become an important issue recently. So various APF(Active Power Filter) has been proposed to suppress harmonics caused by nonlinear load. This paper presents a new concept of UPS system that provides the combined functions of APF. An off-line UPS similar to voltage type APF that proposed in this paper. The operation of the new off-line UPS system used not only eliminate the harmful harmonics caused by nonlinear load but also offer load voltage continuity. A half-bridge inverter is utilzed to deliver clean power to the loads during power outage or to suppress the harmonics from the line current in normal. It is efficient and economical because the one inverter use for combined function. We use 8051 single chip microprocessor for software synchronization, generation of reference voltage waveform and SSR(Solid State Relay)control. Its transient performance is good at the moment of the change of operation mode.
One-Chip uP에 의한 CO₂가스메탈 아크용접기의 디지털 제어기 설계에 관한 연구
최규하,채영민,송성학,우동학,한광수,안기은 건국대학교 1997 學術誌 Vol.41 No.2
With the development of semiconductor devices, adaptation of microcontroller prevails in industrial area. But in arc welding industry, there has not been much progress in adoption microcontroller technology. Therefore, this paper shows the application of digital control technology to welding machine. This paper presents the design of microcontroller that is appropriate for three phase CO2 gas metal arc welding machine. By using microcontroller in CO2 gas metal arc welding machine, the overact cost can be reduced compared to analog type one. Also TMS370C850 microprocessor is used as overall microcontroller for the arc welding machine.