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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
Journal Basic Information
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
Selecting the target year
A Study on High Power Factor Electronic Ballast for Metal Halide Discharge Lamp Using a Double Resonant Inverter
Park Jae-Wook ; Seo Cheol-Sik ; Nam Seung-Sik ; Kim Hae-Jun ; Won Jae-Sun ; Kim Dong-Hee ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 313~322
In this paper, High power factor electronic ballast using a double resonant Inverter for 250[W] MHD lamp is designed and implemented. Proposed electronic ballast is composed of configuration that is cascaded boost active PFC circuit as power factor corrector and half-bridge double resonant inverter Into two stage approach. Theoretical analysis of circuit and characteristics estimation is generally illustrated by using normalized parameter. To remove the phenomenon of acoustic resonance in the lamp, Simple frequency controller composed timer IC and driving IC is designed and employed on the ballast. The experimental results show that an high power factor electronic ballast using a double resonant inverter is operated stably.
Sensorless Control of PM BLDC Motor Drive Using Third Harmonic
Yoon Yong-Ho ; Kim Yuen-Chung ; Won Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 323~330
In order to increase reliability and reduce system cost, this paper studies particularly applicable method for sensorless PM BLDCM drive system. The waveform of the motor internal voltages(or back emf) contains a fundamental and higher order frequency harmonics. Therefore the third harmonic component is extracted from the stator phase voltage. The resulting third harmonic signal keeps a constant phase relationship with the rotor flux for any motor speed and load condition, and is practically free of noise that can be introduced by the inverter switching, making this a robust sensing method. In addition, a simple starting method and a speed estimation approach are also proposed. Some experimental results are Provided to demonstrate the validity of the proposed control method.
Novel PWM Methods for Two-Leg and Four-leg Two-Phase Inverter Fed Two-Phase Induction Motor
Jang Do-Hyun ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 331~338
In this paper the novel pulsewidth modulation(PWM) technique for the two-leg and four-leg two-phase inverter is proposed. The conventional space vector PWM technique for two-phase inverter was complex. The proposed PWM for two-leg inverter, which is used by sinusoidal PWM method, is simpler than the conventional SVPWU technique. Also, a simple PWM technique for four-leg two-phase inverter is proposed. Such PWM technique is based on PWM technique for two-leg inverter. Practical verification of theoretical predictions is presented to confirm the capabilities of the new techniques.
A Novel PWM Method for Three-Leg Two-Phase Inverter Fed Two-Phase Induction Motor
Jang Do-Hyun ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 339~346
It is complex to realize the reference voltage vector by the space vector PWM method in three-leg two-phase inverter In this paper a new PWM technique for three-leg two-phase inverter fed two-phase induction motor is poroposed assuming that three-leg two-phase inverter is equivalent circuit for 'four-leg two-phase inverter with the connected two windings'. From assumption, six sectors are decreased to four sectors, and simple sinusoidal PWM method instead of SVPWM is applied to three-leg two-phase inverter. Also, the switching pattern to determine the switching periods at each sector is proposed. Practical verification of theoretical predictions is presented to confirm the capabilities of the new techniques.
Modeling and Design of Average Current Mode Control
Jung Young-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 347~355
In this paper, a new continuous~time small signal model of an average current mode control is proposed. Sampling effect Is considered to obtain the proposed small signal model. By the proposed model, the high frequency response characteristics of current loop gain might be predicted accurately compared to previous models. And this leads the prediction of inductor current response of the proposed model to be accurate compared to others. 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.
The high Efficiency Ballast for MHD Lamp with a Frequency Controlled Synchronous Rectifier
Hyun B.C. ; Lee I.K. ; Cho B.H. ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 356~362
In this paper, in order to develop a simple and high efficient ballast without an external ignitor, a half-bridge type ballast with a coupled inductor and a frequency controlled synchronous rectifier is proposed. The Internal LC resonance of the buck converter is used to generate a high voltage pulse for the ignition, and the coupled inductor filter is used for steady state ripple cancellation. Also, a synchronous buck converter is applied for the DC/DC converter stage. In order to improve the efficiency of the ballast, a frequency control method is proposed. This scheme reduces a circulation current and trun off loss of the MOSFET switch on the constant power operation, which results in increase of the efficiency of the ballast system about 4
, compared to a fixed frequency control. It consists a 2-stage version ballast with a PFC circuit. The results are verified nth hardware experiments.
Performance Improvement of Reduced Order Extended Luenberger Observer(ROELO) based Sensorless Vector Control Fed by Matrix Converter With Non-linearity Modeling
Lee Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 363~372
This paper presents an improved sensorless vector control system for high performance induction motor drives fed by a matrix converter with non-linearity compensation. The nonlinear voltage distortion that is caused by commutation delay and on-state voltage drop in switching devices is corrected by a new matrix converter model. A Reduced Order Extended Luenberger Observer (ROELO) is employed to bring better response in the whole speed operation range and a method to select the observer gain is presented. Experimental results are shown to illustrate the performance of the proposed system.
A Compensation Method considering Unbalance of Reactor at Source Side in Driving 3 Phase Voltage type PWM Converter
Chun, Ji-Yong ; Lee Sa-Young ; Cho Yu-Hwan ; Lee Geun-Hong ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 373~379
In this paper, the control algorithm of DC source device for inverter starting is proposed and the control method for compensating unbalance system source on operating time in the voltage type PWM converter with driving and regenerative faculty is suggested. The maintaining way of balancing condition for converter of AC source is used the compensating unbalanced status by current control loop. Because it is possible that the unbalanced System control is used to leakage transformer not equaled reactance by each phase in rectifier system, the proposed H/W and control algorithm of rectifier system is contributed to minimize of device and rising efficiency.
High Power Density Open-frame Type DC-DC Converter Module with Constant Current Control
Lee Darl-Woo ; Ahn Tae-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 380~387
We report the performance of an open-frame type low-voltage high-current DC-DC converter module developed using an active clamp forward converter circuit and single ended rectifier. The converter module is designed with the specifications of an 3.3V output voltage, 30A output current, 100W output power and 36-75V input voltage. The synchronous rectifier is used to reduce the conduction loss at high current level and constant current control using precision PCB resistance is adapted to enhance the over current protection function in the system configuration. A prototype converter module is successfully implemented within 8mm height and quarter brick size (58x37mm) and recorded an
power density, 90.6
efficiency and 0.07
voltage regulation for the entire Input voltage range, thereby demonstrating its application potentials to future telecommunication electronics.
Sensorless Driving System of Switched Reluctance Motor Using Impressed Voltage Pulse
Yoon Yong-Ho ; Kim, Yuen-Chung ; Won Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 388~396
SRM has not been put into practical applications widely because of its large torque ripple, acoustic noise and low power factor. In addition, a traditional position sensor is needed for the drive control. So we propose an improved sensorless drive method of Switched Reluctance Motors using impressed voltage pulses. Conventional impressed voltage pulse method has a problem of phase delay because of low-pass filter. So in this paper we propose an unproved sensorless driving method based on the impressed voltage pulse using new pulse-shift circuit technique that overcomes the phase delay and start-up problem. Proposed method is implemented in a simple analog circuit instead of using an expensive DSP.
Firing Angle Control of Soft Starter for Reduction of Inrush Current during Grid Connection of Induction-type Wind Generator
Song Seung-Ho ; Kwon Tae-Hwa ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 397~402
A new control algorithm of soft starter is proposed for the reduction of the inrush current during the grid connection of the induction-type wind power generator. Currently, the fixed speed wind turbine using induction generator is the most popular wind generation system in Korea. It is shown that the amount of inrush current mainly depends on the control algorithm of the soft starter, a thyristor-based grid connection device. For the simulation study, a 600kw wind turbine simulation model is developed and the transient waveforms are investigated with conventional md proposed methods. Also experimental results using 3.7kW experimental set-up show that the peak value of inrush current is reduced about 20
using proposed algorithm.
A Solar Array Shunt Switching Unit Considering Worst Case Analysis
Choi Jae-Dong ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 403~410
This Paper Presents development of solar may shunt switching unit with a fully regulated Power regulation for Geostationary Earth Orbit(GEO) satellite. This shunt switching unit comprises the solar may shunt modules that regulate the solar array power. These solar array shunt modules connect/disconnect the solar array segments to/from the bus through switching actions. And that is also possible simply extension to an existing design by FPGA control logic changing. In order to verify the proposed design, the control logic and worst case analysis are analyzed and the simulation and experimental results we shown.
Design of Sliding Mode Observer for Solar Array Current Estimation in the Grid-Connected Photovoltaic System
Kim IL-Song ; Baik In-Cheol ; Youn Myung-Joong ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 4, 2005, Pages 411~419
In this paper, a sliding mode observer for solar array current estimation in the photovoltaic power generation system is presented. The solar array current estimation Information is obtained from the sliding mode observer and fed into the maximum power point tracker to update the reference voltage. The parameter values such as inverter dc link capacitances cm be changed up to 50
from their nominal values and the linear observer can't estimate the correct state values under the parameter variations and noisy environments. The configuration of sliding mode observer is simple, but it shows the robust tracking performance against parameter variations and modeling uncertainties. In this paper, the method for constructing the sliding mode observer using equivalent control input is presented and the convergence of the proposed observer is verified by the Lyapunov method. The mathematical modeling and the experimental results verify the validity of the proposed method.