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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 10, Issue 6 - Dec 2005
Volume 10, Issue 5 - Oct 2005
Volume 10, Issue 4 - Aug 2005
Volume 10, Issue 3 - Jun 2005
Volume 10, Issue 2 - Apr 2005
Volume 10, Issue 1 - Feb 2005
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Power Factor Correction of Switched Reluctance Motor Drive System using Boost Converter
Yoon Yong-Ho ; Kim Jae-Moon ; Lee Tae-Won ; Kim Hack-Seong ; Won Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 211~218
Switched Reluctance Motor(SRM) offers the advantages of simple and robust motor construction, high speed and high efficiency over a wide operating range of torque and speed, excellent controllability. However SRM has the disadvantages of high current harmonics, and low power factor because the required output of speed and torque is produced by the discontinuous and loss of power system, and brings about the incorrect operation of electronic system. This paper deals with an energy efficient converter fed SRM system with the reduced harmonics and improved power factor. The validity of the proposed scheme is verified via experiments. We are implemented the proposed control system using 80C196KC micro-controller.
New Discrete-time Small Signal Model of Average Current Mode Control for Current Response Prediction
Jung Young-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 219~225
In this paper, a new discrete-time small signal model of an average current mode control is proposed to predict the inductor current responses. Compared to the peak current mode control, the analysis of the average current mode control is difficult because of its presence of an compensation network. By utilizing sampler model, a new discrete-time small signal model is derived and used to predict the behaviors of an inductor current of average current mode control employing generalized compensation networks. In order to show the usefulness of the proposed model, prediction results of the proposed model are compared to those of the circuit level simulator, PSIM and experiment.
Bridgeless High Efficiency ZVZCS Power Factor Correction Circuit for PDP Power Module
Ryu Byung-Gyu ; Moon Gun-Woo ; Cho Kyu-Min ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 226~232
Recently, many nation have released standard such as IEC 61000-3-2 and IEEE 59, which impose a limit on the harmonic current drawn by equipment connected to AC line in order to prevent the distortion of an AC Line. Therefore, Plasma Display Panel(PDP) which is highlightened in digital display device also has the Power Factor Correction(PFC) circuit to meet the harmonic requirements. In PDP power module, the conventional boost converter is usually used for the PFC circuit. However, it comes serious thermal problem on it's bridge diode due to heat of PDP, and therefore the system stability is not guaranteed. In this paper, the bridgeless boost converter, which is used for PFC circuit of the PDP power module, is designed and verified the possibility of the application In a practical product in a view of efficiency, component count, temperature and etc.
Development of AC Electric Vehicle Propulsion System (Converter/Inverter) using IPM Switching Device
Kno Ae-Sook ; Kim Tae-Yun ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 233~240
In this paper, AC electric vehicle propulsion system(Converter/Inverter) using high power semiconductor, IPM is proposed. 2-Parallel operation of two PWM converter is adopted for increasing capacity of system and the harmonic content is eliminated by the phase shaft between two PWM converters switching phase. VVVF inverter control is used a mixed control algorithm, where the vector control strategy at low speed region and slip-frequency control strategy at high speed region. The proposed propulsion system is verified by experimental results with a 1,350kW converter and 1,100kVA inverter with four 210kW traction motors.
Flywheel Energy Storage UPS with Voltage Compensation
Lee K. S. ; Kim J. W. ; Chun T. W. ; Kim I. D. ; Kim H. G. ; Lee H. H. ; Nho E. C. ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 241~247
This paper deals with the operation of a flywheel energy storage UPS. The UPS has good features such as long life-time, improved efficiency, no environmental problems, reduced size and space, and low maintenance cost compared with the conventional UPS using battery. The operating principle of the UPS is analysed in each mode including voltage compensation as well as uninterruptible power supply. Especially, the tracking characteristic of the disturbed phase of the source voltage after outage is analysed. The usefulness of the system is proved through simulations and experiments.
Design of the High Density Power Supply with Flat Transformer
Baek J.W. ; Kim J.H. ; Yoo D.W. ; Kim J.S. ; Ryu M.H. ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 248~256
This paper presents the design method of the DC/DC converter using flat transformer which is suitable for midium or large capacity and high density power supply. Flat transformer module is composed and manufactured of multi-transformers in parallel and has a number of parallel single turn secondary windings. Therefore, its leakage inductance is highly decreased and it is more suitable for high frequency operation than conventional one. In this paper, we manufactured and tested 750W AC/DC converter with variable output powers to verify the performance of the flat transformer.
Diagnosis Method and Characteristic Analysis of Shorted Turns on Generator Rotor using Flux Sensorless
Kim Sun-Ja ; Jeon Ywun-Seok ; Lee Seung-Hak ; Jeong Byung-Hwan ; Lee Myung-Un ; Choe Gyu-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 257~263
Short-circuit rotor windings on a generator causes unstable oscillation of unbalance of flux, asymmetrical heat. In order to prevent serious accidents of short-circuit rotor windings, it is important to study the shorted-turn diagnosis method for rotor windings of the generator. To improve the defects of the diagnosis with sensors, the new sensorless method for rotor shorted-turn diagnosis is proposed, which is to measure the electrical values of the voltage and current at the generator and then to detect if the shorted-turned phenomena would occurred. For the feasibility of the suggested method the theoretical results are shown in the aspects of the air-gap flux density, the flux leakage, the generated output voltage and the shorted field current through the digital simulation. Also the possibility of decision for the suggested sensorless method could be shown in this paper.
Performance Characteristics of Broadband PLC at Out-door Field Test-bed
Park Byung-Seok ; Yoo Dong-Hee ; Hyun Duck-Hwa ; Choi Young-Lim ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 264~273
Broadband power line communications have been receiving tremendous interest In recent years because this technology enables utilities to deploy a communication network over existing power line infrastructures. Despite the enormous potential, there is some skepticism about the technology and its commercial viability. In this paper, we investigate the performance characteristic of PLC through field test carried out in actual households. Also it addresses major field deployment aspects, such as range, coverage, the number of node for operation and maintenance.
Study of AC/DC Resonant Pulse Converter for Energy Harvesting
Ngo Khai D.T. ; Chung Gyo-Bum ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 274~281
A new resonant pulse converter for energy harvesting is proposed. The converter transfers energy from a low-voltage AC current to a battery. The low-voltage AC current source is an equivalent of the piezoelectric generator, which converts the mechanical energy to the electric energy. The converter consists of a full-bridge rectifier having four N-type MOSFETs and a boost converter haying N-type MOSFET and P-type MOSFET instead of diode. Switching of MOSFETs utilizes the capability of the
regional operation. The operational principles and switching method for the power control of the converter are investigated with the consideration of effects of the parasitic capacitances of MOSFETs. Simulation and experiment are performed to prove the analysis of the converter operation and to show the possibility of the
W energy harvesting.
Speed Estimation and Control of IPMSM Drive using NFC and ANN
Lee Jung-Chul ; Lee Hong-Gyun ; Chung Dong-Hwa ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 282~289
This paper proposes a fuzzy neural network controller based on the vector control for interior permanent magnet synchronous motor(IPMSM) drive system. The hybrid combination of neural network and fuzzy control will produce a powerful representation flexibility and numerical processing capability This paper does not oかy presents speed control of IPMSM using neuro-fuzzy control(NFC) but also speed estimation using artificial neural network(ANN) controller. The back propagation neural network technique is used to provide a real time adaptive estimation of the motor speed. The error between the desired state variable and the actual one is back-propagated to adjust the rotor speed, so that the actual state variable will coincide with the desired one. The back propagation mechanism is easy to derive and the estimated speed tracks precisely the actual motor speed. Thus, it is presented the theoretical analysis as well as the analysis results to verify the effectiveness of the proposed method in this paper.
Design of Filter for Output Signals in Incremental Encoder for Detecting Speed and Position of Motors
Ahn Jung-Ryol ; Lee Hong-Hee ; Kim Heung-Gun ; Nho Eui-Cheol ; Chun Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 290~295
The incremental encoder has been mostly used to measure the speed and position of the motor. As the output signals of encoder are high frequency digital signals, they have much influence on radiation noises due to switching of the power semiconductor circuits. It is so difficult to suppress the noises with the conventional LPF. In this paper, the hardware digital filter for suppressing noises in the output signals of the encoder signals is developed. As both the clock frequency and counter in the digital filter for encoder are easily adjusted according to the kinds of noises, any noises in the encoder can be entirely eliminated. The performance of the digital filter has been verified by simulation and experimental results.
A Single Phase Multi-level Active Power Filter System using Instantaneous Reactive Power Harmonic Detection Method
Kim Soo-Hong ; Kim Sung-Min ; Lee Kang-Hee ; Kim Yoon-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 296~301
This paper proposing the use of the Instantaneous reactive power method as a harmonic detection method for a single phase active filter system. This method is to detect harmonic components through d-q frame approach. The conventional use of d-q frame approach for a 3-phase system Is extended to the single phase system. The proposed system uses a multi-level inverter for harmonic compensation and the inverter is connected to the input side without using transformers. The proposed algorithm is verified by simulation and experiment.
An Improved ZVS Active Clamp Forward Converter
Choi Sun-Ho ; Lee Hyun-Kwan ; Kim Eun-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 3, 2005, Pages 302~311
We propose an improved active forward converter by adding a non-dissipative snubber circuit to the secondary of the conventional active clamp forward converter in this paper. The snubber circuit is composed of a tapped inductor, a snubber capacitor, and two diodes. Comparing with the conventional one, the proposed one makes it possible ZVS to operate in a smaller magnetizing current condition. The operational principles and the equivalent mode analysis of an improved active forward converter are mentioned in this paper. In conclusion, we constructed the prototype of the modified active forward converter with 300W output capacity and verified higher efficiency compared to the conventional one.