Young-Min Chae

A Study on a Hybrid Induction Heating System for Laser Printer

Recently, the demand for the development of high quality and high-speed laser printers and efficient power utilization has required. Among complicated electro-mechanic devices in laser printers, the toner-fusing unit consumes above 90[%] of all electrical energy needed for printing devices. Therefore, the development of a more effective energy-saving toner fusing process becomes a significant task in great demand. Generally, there are several ways to implement a fusing unit. Among them this paper presents a new induction heating method. The proposed induction heating method enables the increase of coupling coefficient between heating coil and heat roller which also increases total energy transfer efficiency. Therefore, the proposed IH (Induction Heating) inverter system provides very fast W.U.T. (Warm UP Time) as well as higher efficiency. Through experimental results, the proposed control system is verified.

A study on the characteristic of high voltage type instantaneous current source for laser printer

In this paper, a new self-oscillated type HVPS (high voltage power supply) to charge the OPC (organic photo conductor) drum in laser printer is proposed, which has variable constant current source characteristics to improve the charge characteristic of the OPC drum. The proposed control method enables high quality printing characteristics regardless of the circumstance change such as ambient temperature or humidity by changing the current reference signal. To verify the proposed control method various experiments are performed.

Virtual-implemented solar cell system with new cell model

The output of solar cell or array depends on the weather conditions such as temperature and insolation level. If the output of the photovoltaic system would be reconstructed under any weather conditions, so it is so easy to develop the inverter and its related system, and also control algorithm. This can be achieved by the VISC (virtual-implemented solar cell) system studied in this paper. A few, I-V curves are provided by the manufacturers, and so any I-V value between the given curves is unknown. The new model for solar cell is proposed, which is based on the interpolation. Both simulation and experiment are executed to show the validity of the proposed VISC system.