Soon-Chan Hong

Dankook University · Department of Electronics and Electric Engineering

This paper proposes a new secondary battery charger/discharger available for zero voltage discharge which is used for test equipments and formation process. The proposed system is a switching type converter, and thus the system is high efficiency and more compact as compared with linear type charger/discharger. Conventional switching type charger/d...

UPS is largely divided into passive-standby, line-interactive, and double-conversion types. In general, a double-conversion type is used at a site requiring a high reliability. The main function of the double-conversion UPS is providing the constant voltage, constant frequency, regardless of the linear or non-linear load and variation of the load....

High voltage power is needed by diverse application fields such as high precision medical equipment, and development of an X-ray generator equipped with large capacity power is accordingly required. Commercial AC power based X-ray generator has a disadvantage of having limitation in the location and of being sensitive to the power characteristics,...

This paper proposes a switching type secondary battery discharge system capable of zero-voltage discharge. The proposed system can discharge until the voltage of a battery reaches 0[V] even in the domain with low battery voltage, while maintaining the discharge current uniformly at a set point. In order to confirm usefulness of the proposed system,...

In this paper, a 300[W] class boost type single-phase inverter system which can compensate voltage sag on source side is designed and implemented. This system is a two-stage conversion system composed of a boost converter and a PWM inverter. If the voltage sag has appeared at the point of common coupling, the boost converter would be operated to co...

This paper describes the performance comparison results for current controller of a single-phase PFC converter with 1-switch voltage doubler strategy for single-phase double-conversion UPS(Uninterruptible Power Supply). A single-phase PFC converter with 1-switch voltage doubler strategy needs a diode bridge and one bidirectional active switch. Thus...

This paper describes the operation characteristic of a single-phase PFC converter with 1-switch voltage doubler strategy for single-phase double-conversion UPS. A single-phase PFC converter with 1-switch voltage doubler strategy needs a diode bridge and one bidirectional active switch. Thus it is possible to reduce the material cost. However, the s...

This paper proposes a boost type single-phase inverter system to compensate the voltage sag appeared on source side. The proposed system is composed of a boost converter, a PWM inverter, and a bypass diode. If the voltage sag has appeared in input voltage, the boost converter would be operated to compensate it in the proposed system. The boost conv...

This paper proposes a boost type inverter system to compensate the voltage sag has appeared in voltage sources. If the voltage sag has appeared in input voltage, a boost converter would be operated to compensate it in the boost type inverter system. The boost converter would not be operated when the magnitude of input voltage is more than 90 %, and...

Lithium battery is widely used as the power source of various electronic devices. The formation process which is the repeated charging and discharging process is essential in the production of lithium battery. In this paper, it is proposed and designed the DC-DC converter that can charge and also discharge the lithium battery in one converter. The...

Isolated boost converter is desirable in the dc/dc converter applications where isolation is required and extremely high step up is needed. Transformer used to step up low input voltage into high output voltage must satisfy the volt-sec balance condition. Conventional isolated boost converter is controlled with conducting intervals overlapping. In...

In this paper, we propose a single-phase inverter system using new modulation method. The proposed system is composed of a buck-boost converter and an inverter and controlled by PWAM scheme. PWAM method is a new modulation method which is the incorporation of PWM(Pulse Width Modulation) and PAM(Pulse Amplitude Modulation) methods. The DC voltage wh...

The formation process is presently used in the manufacture of secondary batteries such as a lithium battery. Therefore, charging and discharging processes for lithium battery are essential for the formation process. In case that the nominal capacity is 2,600 mAh and lithium battery is charged/discharged at 0.5 C, the lithium battery charge/discharg...

With the increase in the use of advanced digital information devices that are sensitive to power failure, the demand of UPS (Uninterruptible Power Supply) is increased. This paper proposes a new modulation method for double-conversion single-phase UPS system. The proposed modulation method is the incorporation of PWM (Pulse Width Modulation) and PA...

AC-PDP (plasma display panel) uses a high sustain voltage and its power consumption is also high so that circuit cost is expensive. An energy recovery circuit for AC-PDPs with reduced sustain voltage was proposed to solve these disadvantages. However, the circuit has disadvantage that the switching elements are operated with hard-switching at the s...

The main goal of this paper is to simulate a doubly-fed induction generator (DFIG), which is similar to a real system. Wind velocity data is applied to a 2D lookup table as a speed reference for an induction motor instead of the turbine. A real electric machinepsilas parameters are put in the simulator to get some results of the real system. The Ma...

The aim of the paper is to analysis on train propulsion system and to study for energy saving. For this study, we make the program that simulates actual operation of the train route to get same experiment result. The train running simulation is performed from starting station to 4th station by using the route data of Deajeon city Metro Subway. The...

The aim of the paper is to analysis on train propulsion system and to study for energy saving. For this study, we make the program that simulate actual operation of the train route. The train running simulation is performed from starting station to 4th station by using the route datas of Deajeon Metro Subway. The study for control method of electri...

This paper proposes a new sustaining driver for AC PDPs (plasma display panels) with reduced sustain voltage by half, which improves the performance of conventional circuits such as TERES(technology of reciprocal sustainer). In the TERES circuit, the sustain voltage is the half of general sustaining driver, however, there is no energy recovery circ...

In this paper, a novel energy recovery circuit for AC PDPs(Plasma Display Panels) with reduced sustain voltage is proposed to improve the performance of conventional circuits such as TERES(TEchnology of REciprocal Sustainer). In the TERES circuit, the sustain voltage is the half of general sustaining driver for AC PDPs, however, there is no energy...