Byung-Hwan Jeong

A novel pulse power supply for magnetron using high voltage capacitor embedded high frequency transformer

This paper described that novel high voltage capacitor (HVC) embedded high frequency transformer and novel inverter power supply topology for driving magnetron in microwave oven. This transformer is used to achieve down-sizing, low-cost and efficiency improvement. Proposed transformer has HVC in its secondary winding. Therefore, this transformer does not need external high voltage capacitor which used in conventional power supply. As use of this transformer, output voltage is shifted from ground to above 2000 [V] and efficiency of microwave oven can be improved. The weight of proposed transformer is about one sixth of conventional one and efficiency is improved by seven percent compared to the efficiency of the conventional system.

Parallel Operation Control of N+1 Redundant Inverter System

In this paper, a novel parallel operation algorithm of N+1 redundant inverter system with no control interconnections for loas-sharing is presented. The proposed control system eliminates the sensing noise and interconnection interface of conventional parallel operation system. To reduce a reactive power deviation in wireless control method, this technique automatically compensates for inverter parameter variation and line impedance imbalances with wireless auto-tuning method. In addition, to increase reliability on transient characteristics of parallel operation, a virtual injected impedance is adopted to eliminate a circulation current among inverter modules. Simulation results are provided in this paper to prove the proposed novel algorithm.

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.