This paper designs a drive for high efficiency of the 3-phase IM (induction motor) for FCU(Fan Coil Unit). The speed control system of 3-phase IM for FCU has been implemented by a TMS320LF2406 DSP chip. The DSP TMS320LF2406, which include the most peripheral circuit for control of the Industrial motor suitable for AC motor drive. This type of the controller can be obtained low cost and high reliance. The proposed drive system of the 3-phase IM for the FCU is verified by simulation. The results show the speed control characteristics of the control strategy Proposed for 3-Phase IM drive.

To obtain a high performance in a direct vector controlled induction machine, it is essential to correct estimation of rotor flux. The accuracy of flux observers for induction machines inherently depends on parameter sensitivity. This paper presents an analysis method for conventional flux observers using Parameter Sensitivity. The Parameter sensitivity is defined as the ratio of the percentage change in the system transfer function to the percentage change of the parameter variation. We define the ratio between real flux and estimated flux as the transfer function, and analyzed a parameter sensitivity of this transfer function.

Direct torque control (DTC) scheme provides a very quick torque response without the complex field-orientation block and inner current regulation loop. DTC is known as an appropriate scheme for high power induction motor drives because it can be used at lower switching frequency There are a major drawbacks with the application of DTC schemes it is large current harmonics due to flux drooping in a low speed range. In order to solve the problem, the fuzzy variable switching sector scheme are adopted in this paper. A meaningful contribution of this paper is to propose a simple realization scheme of the fuzzy variable switching sector technique. Experimental results show the effectiveness of this proposition.

This paper describes a control scheme for direct torque and flux control of induction machines. The proposed predictive flux control scheme has directly calculated the reference voltage space vector based on flux errors in order to control the torque and flux. This proposed control scheme has not the requirement of a separate current regulator and proportional-integral (PI) control of the flux, torque, and/or current error, thereby improving transient performance and also has the advantage of less torque ripple in steady state with a fixed switching period. The effect of proposed method has been proven by simulations and experiments.

A Switched Reluctance Generator attracts much attention in the generator because of high efficiency, simplicity, and ruggedness. However, they require rotor position information to operate. In many systems, the rotor position sensor is expensive, limited and undesirable. This paper describes a new approach to estimating the rotor position of the SRG from the measured terminal voltage and current for rotor position sensorless control. The proposed method is based on the instantaneous flux of the SRG. The proposed technique is very simple. The proposed method is verified by computer simulation and experiments.

This paper presents a digital motion control system for Reluctance Synchronous Motor (RSM) drives with direct torque control (DTC). The system consists of stator flux observer, torque estimator: two hysteresis band controllers, an optimal switching look-up table, IGBT voltage source inverter(VSI), and TMS320C31 DSP controller by using fully integrated control software. The stator flux observer is based on the combined voltage and current model with stator flux feedback adaptive control of which inputs are current, voltage and actual rotor angle for wide speed range. In order to prove the suggested motion control algorithm, There are some simulation and testing at actual experimental system. The developed digitally high-performance motion control system are shown a good motion control response characteristic results and high performance features using 1.0Kw RSM.

The application of SRM(Switched Reluctance Motor) is dramatically increasing due to a simple mechanical structure, high efficiency and a good high speed characteristics. To control high conduction ratio in motor operation and regenerative voltage in the generator operation multi-level voltage control is effective. This paper proposes multi-level inverter to have a maximum conduction ratio of SRM. The proposed method is verified by experiments.

본 논문은 높은 추력비(전동기 추력/전동기 중량=N/ Kg)를 갖는 영구자석 여자 횡축형 선형 전동기(TFLM)를 가진기 엑츄에이터로 사용하여 부피와 체적을 줄이고 적은 중량이 요구되는 고출력 전동식 가진기 시스템을 유압식을 대체하여 구현하고 가변 변위 및 가변 속도가 가능한 제어 방법을 개발하여 적용하고자 한다.

This paper is suggested an optimal switching angle of a switched reluctance motor drive system for maximum energy ratio. A new magnetizing method with a low-frequency increasing the energy conversion ratio that is related to the efficiency of motor is proposed As results, it improves the efficiency about 2[$\%$]. And a torque ripple is also reduced compared with that of the conventional switching angle magnetizing approach. In order to start softly regardless of a large ripple torque, the profile of phase current is predicted and current control mode was adapted when it is operated under the starting speed.

This paper presents an implementation of motion control system of Switched Reluctance Motor (SRM) using digital hysteresis controller by TMS320F240 DSP. SRM position control system possess several advantages over other motors, including high efficiency, simple structure, low cost, and four-quadrant operation at a wide speed range, especially for the servo drive systems with precision, stability and fast response characteristics in the industrial applications. In the suggested motion control system, position control using digital hysteresis controller is developed, and is evaluated using experimental testing. The developed system for cost reduction and high-performance by fully digital controller is shown a good response characteristic of motion control results.

This paper presents a new partial excitation method of the moving magnet type linear synchronous motor(MMLSM) and proposes a new way of implementation for multi-mover MMLSM. Originally, partial excitation circuit which excites the coils only under the magnet is necessary for proper operation of MMLSM. In conventional partial excitation method there is inevitably impedance unbalance situation. So a new partial excitation method Is proposed to solve this impedance unbalance problem. Based on this partial excitation method, a novel control method for multi-mover MMLSM is proposed. The validity and performance of the proposed partial excitation method and multi-mover MMLSM is verified by experimental results.

Solar energy has many advantage like as purity and infinity. Recently many researches about new energy source are processing in several places around the world. In this paper, the virtual implement of solar cell was proposed to solve the problems as reappearance and repetition of some situation in experiment of photovoltaic. To realize the VISC, mathematical model of solar cell for driving converter was studied and the buck converter were compared in viewpoint of tracking error of characteristic curve of solar cell using computer simulation. Also, Output characteristics of system analyzed through an experiment.

New grid connected PV system of high-frequency link with soft-switching is proposed to solve problems related with transformer and switching loss. The operation of suggested equipment using the soft switching that consists of high frequency transformer is confirmed by computer simulation and experiment that it can improve its efficiency and solve the problems mentioned above.

This paper aims at developing remote control system to control and monitor distributed various devices such as photovoltaic Inverter system through internet. TCP/IP (Transmission Control Protocol/Internet Protocol) and photovoltaic inverter system operated in a row are adopted for network management protocol and applied device, respectively. For controlling and monitoring distributed devices in real-time, java-environment software is constructed. Also, HelloDevice, general-use interface controller between network device and applied device is proposed. Finally, serial communication such as RS-232C is used between controller and applied device.

While PV system is clean energy that do not now out environmental pollution, but is influenced much in surrounding environment. Efficiency decrease cause of PV system is various kinds, try to analyze several specification causes among them through simulation with reference for various kinds effect urea in treatise that see.

Currently there are very limited amounts of resources and serious amounts pollution. Wind power generation system have an advantage of unlimited and unpolluted amount of energy resource. In this paper, for the application of these characteristic and for the generation to be achieved regard of districts and geographical features the energy continuously. The operation characteristics of system were analyzed through experiments for a trial product.

New electronic ballast for metal halide laws is proposed New ballast has higher efficiency than that of conventional ballast. Proposed 2 stage ballast uses low arm switch as synchronous rectifier mitch. Switch-on voltage drop is smaller than that of diode in small current(<1.5A). High arm switch is turned on in zero voltage in proposed ballast. So conduction loss and switching loss are reduced Index word - synchronous rectifier mitch, toro voltage switching, conduction loss, switching loss.

This paper deals with the economical equipment control which is used by internet network system at the industrial workplace. If the control devices can be accessed by internet, we can have the developed possibility of work conditions. In this paper, we presented the advanced digital timer which has a communication function to control and observe panel to realize control solution based on internet to be easily applicable at workplace with low cost. and we used 485 serial communication module to have parallel expansibility and safety. And, this system was experimented and designed for easy system management and status check from remote station through internet As the result of experiment, the circuit configuration would be more simplified than the existing, and it is expected that multi connection control and monitoring can be simply implemented with low cost equipment at industrial workplace.

In conventional three-phase rectifiers, it was necessary to use a transformer to obtain low output voltage. In this paper, we propose a characteristic experimental of three-phase diode rectifiers circuit that achieves low voltage by using a very simple circuit configuration that does not have a transformer and does not need any complex control. We also describe the operation principle of the proposed circuit, and der?ive a theoretical formula for its current waveform. On the basis these theoretical values with experimentally obtained input output current characteristics, current amplification factor, and output voltage characteristics, allowed us to confirm the soundness of our theoretical analyses.

This paper proposed on the Line-Interactive UPS with power factor correction. The paper Line-Interactive UPS topology with its advantages is reviewed. Next introduces Line -Interactive UPS of the series active compensator. The series active compensator controls input currents and power factor.

Recently, as the development of industry, the nonlinear load becomes increased. Because of nonlinear load, the variation of source voltage is generated by the impedace of source side flowed harmonic currents. For blocking harmonic currents by nonlinear load, a series active power filter operates blocking resistance of harmonic currents. The value of blocking resistance shows ideal compensating characteristic out of theoretically infinite value. But the blocking resistance is limited by the problem of the system stability and the capacity of inverter. In this paper, the value of optimum blocking resistance is found by a simulation in the applied system. In the case of unbalanced source voltages, each relation of the blocking resistance is shown. It is proved that blocking resistance of series active power filter relates to a passive filter.

This paper compared a Modified C-dump converter and energy efficient converter topologies, derived from the conventional C-dump converter, for switched reluctance motor (SRM) drives. The proposed topologies overcome the limitations of the conventional C-dump converter, and could reduce the whole cost of the SRM drive. Also, the above converters have simple control requirements; and allow the motor phase current to freewheel during chopping mode. Specially, the voltage ratings of the dump capacitor and some of the switching devices in the proposed an Energy efficient C-dump converter is reduced to the supply voltage ($V_{dc}$) level compared to twice the supply voltage ($2V_{dc}$) in the conventional C-dump converter. Simulation and experimental results of the proposed converters are presented and verified.

Photovoltaic systems normally use a maximum power point tracking (MPPT) technique to continuously deliver the highest possible power to the load when variations in the insolation and temperature occur. A simple method of tracking the maximum power points (MPPs) and forcing the boost converter system to operate close to these points is presented through deriving small-signal model and transfer function of boost converter. This paper aims at modeling boost converter including equivalent series resistance of input reservoir capacitor by state-space-averaging method. In the future, properly designed controller for compensation will be constructed for maximum photovoltaic power tracking control.

This paper presents a new sensorless control scheme using simple duty signal feedback technique in DC-DC converters. The proposed sensorless control scheme (DFC) has the characteristics that they show the same as operation performance of current mode control by using duty feedback technique without current sensor as well as present better dynamic response performance than conventional sensorless current mode control (SCM) in case that input source is perturbed by step change or DC input source includes the . harmonics. Also, the proposed control scheme has good noise immunity and simple control circuits since they have one feedback loop, and can be applied to all DC-DC converters. The concept and control principles of the proposed control scheme are explained in detail and the validity of the proposed control scheme is verified through several interesting simulated results.

In this paper, a DCM operated boost integrated single-stage forward-flyback converter is proposed. This proposed converter has high power factor, low harmonic distortion, and tight output regulation. To increase efficiency, zero voltage switching with asymmetrical control is used. This converter also give low voltage stress in switch and this results in low conduction loss with low turn-on resistance.

In this paper, a high-efficiency double-ended active clamp ZVS forward converter is proposed. This converter can be used in compact size AC/DC converter applications such as a notebook adapter. The principles of operation are described and the zero voltage switching characteristics are analyzed. High efficiency of this converter is verified by the experimental results.

Recently, a ZVT boost converter is embedded in a power factor correction system. The control circuit of the converter assures soft-switching for all the MOSFETs and load regulation. The PFC system contains additional control circuits which assure the input voltage in a sinusoidal form and feed-forward line voltage regulation. In this paper, a soft switching boost converter with zero-voltage transition(ZVT) main switch using zero-current switching(ZCS) auxiliary switch is proposed. Operating intervals of the converter are persented and analyzed. The proposed results show that the main switch maintains UT while auxiliary switch retains ZCS for the complete specified line and load conditions.

In order to solve the problem of system efficiency reduced on account of two stage power conversion, we propose a series resonant full bridge inverter circuit for battery-fed microwave oven. This circuit has both a compact size and a light weight. Also, a frequency control adjusts power levels of the microwave oven. Operational principles are explained in detail. A proto-type inverter circuit with 1[kW] power consumption is built and tested for verifying the operation.

Recently, the interest on power quality has been hot issue. The equipments cause voltage disturbance and has become more sensitive to the voltage disturbance. This paper deals with 5-Level H-Bridge Line-Inter active Dynamic Voltage Restorer(LIDVR) system. The LIDVR has following advantages in comparison with the DVR with series injection transformer It has the power factor near to unity under normal source voltage, can compensate the harmonic current of the load and the instant interruption, and has the fast response. First, the construction, the operation mode and algebraic modeling of LIDVR are reviewed. And then a voltage controller is proposed to get sinusoidal load voltage with constant amplitude. To find PWM method suitable for H-Bridge converter, two PWM methods are compared and analyzed. Finally, simulation results verify the proposed 5-level H-Bridge LIDVR system.

LCD 모니터 화면의 대형화와 슬림화에 따른 모니터 내의 백라이트용 냉음극 방전램프도 가늘어지고 길어지고 있으며, 하나의 램프를 이용한 백라이트로는 휘도의 한계가 있어 램프를 병렬로 사용해 필요한 휘도를 얻고 있다. 본 논문에서는 20인치의 대형 LCD 모니터의 백라이팅 즉 램프구동을 위한 안정적이면서 대출력을 가지는 멀티램프 구동용 인버터를 설계하였다. 본 연구에 사용된 20인치 LCD 모니터는 내부에 상하 각각 3개씩 6개의 램프를 내장하고 있으며, 제작된 인버터는 입출력 휘도대비 $90\%$의 효율을 얻었으며, 최대휘도에서의 램프간의 출력전류차가 미소하고, 8개의 멀티램프 구동도 가능하다.

A Single-phase bi-directional inverter Using a diode bridge-type resonant circuit to implement ZVT(Zero Voltage Transition) switching is Presented. It is shown that the ZACE(Zero Average Current Error) algorithm based polarized ramptime current control can provide a suitable interface between diode bridge-type resonant circuit DC link and the inverter. The current control algorithm is analyzed about how to design the circuit with analyzed switch which m ZVT operation for the main power switch The simulation and experimental results would be shown to verify the proposed current algorithm, because the main power switch is turn on with ZVT and the bi-directional inverter is operated.

본 논문에서는 LCL공진형인버터를 사용하여 넓은 부하의 변화에 대해서도 공진주파수 추종제어와 공급전력제어가 가능한 전자기 연속주조제어기를 설계하고 이의 특성을 모의실험을 통하여 확인하였다.

A new and high-efficient energy-recovery circuit is proposed to drive a Plasma display panel (PDP) and compared with the conventional circuit. The Proposed circuit uses only two inductors and no auxiliary circuit to recover the energy stored in the equivalent intrinsic capacitance of Plow DP so that it feartures a very simple structure, small volume, fewer power devices. production cost and high efficiency. Besides, the light emitted from PDP is very stable and uniform. It is suitable for wall-hanging color TVs. The proposed circuit, operating at 200kHz, is verified to be applicable on a 42-inch PDP by an experiment.

An IGBT driver for serially connected pulse switching IGBTS was contructed and tested. The IGBT driver has ten output pulses with 1 ${\mu}ysec$ pulse width Its pulse repetition-rate can adjusted from 0 to 20 kHz. The output pulses was insulated from 10 kV high voltage by a pulse transformer. Their voltage amplitude are 18 V, voltage rising time 250 nsec., and voltage falling time 200 nsec when IGBT gates with 12 nF input capacitance are connected.

This paper deals with the translation and terminology adjustment of international electrotechnical vocabulary(IEV) for operations within power electronic equipment. The IEVs are found in the section 551-16 of IEC 60050-551. The standard has been prepared by TEC Technical Committee 22 : Power Electroncis, under the responsibility of IEC Technical Committee 1 : Terminology and is consists of 9 sections with 221 terms. This paper contains the results for 71 terms among them.

This paper proposes a nonlinear impedance circuit composed by diodes and inductors or capacitors. This circuit needs no control circuits and switches, and the impedance .value is changed by the polarity of current or voltage. and this paper presents one of these applications to improve the input current of capacitor input diode rectifiers. The rectifier using the nonlinear impedance circuit id constructed with four diodes and four capacitors in addition to the conventional rectifiers, that is, it has eight diodes and five capacitors, including a DC link capacitor. It makes harmonic components of the input current reduce and the power factor improve. A circuit design method is shown by experimentation and confirmed simulation. It explained that compared conventional pulse width modulated (PWM) inverter with half pulse-width modulated (HPWM) inverter. Proposed HPWM inverter eliminated dead-time by lowering switching loss and holding over-shooting.

This treatise is treatise about interception effect of electromagnetic waves that is becoming social problem 21th century. Analyzed incidental and value comparison after used a widely spread computer mouse and electricity floor covered with laminated paper by materials for experiments, and apply composition conductibility electromagnetic waves cover material to this products, and limp an experiment in everyday life in this treatise.

In this paper, a novel overmodulation strategy for space-vector PWM(SVPWM) inverters to utilize dc link voltage fully is presented. The proposed strategy uses the concept of SVPWM based on the zero sequence signal(offset voltage) injection principle. So, by modifying the pole voltage simply, the linear control of inverter output voltage over the whole overmodulation range can be achieved easily. The validity of the proposed strategy is confirmed by the experimental results.

This paper presents a precision voltage control technique of a single phase PWM inverter for a constant voltage and constant frequency(CVCF) applications. The proposed control employes a PLL compensating loop which minimize the steady state error and phase delay. The computer simulation and experiment are carried out for the actual single phase PWM inverter and the results well demonstrate the effectiveness of the proposed control.

This paper describes the reduction of vibration and position error of Linear Pulse Motor(LPM) with the control method of PWM duty ratio by using Motion Controller in LPM. The LPM is operated on micro-stepping drive, that the linear scale is sequently returned the position signals of a micro-meter And next micro-step is controlled with the scale factor when position error is occurred. The scale factor is experimently acquired.

In this paper, the design method of LCL filter at the AC input side of a voltage fed active power filter is proposed. The characteristics of harmonics suppression and current control performance of active power filter are described using the analysis of the relation of these characteristics and DC voltage, switching frequency, and AC inductor values. The design examples are shown and the validity of the proposed design method is verified through the PSIM simulation.

In this paper, a new predictive control algorithm considering the parameters of series active filter has been proposed to improve the performance. By using the proposed control scheme, the current ripple drastically reduced and an improved steady state performance can be obtained. The proposed method has another advantage in the size. and cost by excluding additional passive fitters. The validity of the proposed method will be proved by the computer simulation.