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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 15, Issue 6 - Dec 2010
Volume 15, Issue 5 - Oct 2010
Volume 15, Issue 4 - Aug 2010
Volume 15, Issue 3 - Jun 2010
Volume 15, Issue 2 - Apr 2010
Volume 15, Issue 1 - Feb 2010
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Self-Oscillating Flyback Converter for Reducing Standby Power
Yoon, Young-Nam ; Jang, Doo-Hee ; Roh, Chung-Wook ; Han, Sang-Kyoo ; Kim, Jong-Duck ; Hong, Sung-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 1~8
DOI : 10.6113/TKPE.2010.15.1.1
This paper presents the self-oscillating flyback converter for reducing standby power without a control-IC. The proposed self-oscillating flyback converter includes a DC-Blocking capacitor for reducing constant power loss of initial switching path of a conventional self-oscillating flyback converter. it's possible to reduce the standby power to 1W and power efficiency. To confirm the validity of proposed system, comparison of conventional system, verification of experimental results is presented by realization of 35W power system.
Network-Based Overhead Crane Control System Using Matrix Converters
Lee, Hong-Hee ; Chun, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 9~16
DOI : 10.6113/TKPE.2010.15.1.9
This paper presents supervisor control methods at a matrix converter controlled overhead crane system based on a controller area network (CAN). Four induction motors are used to drive the gantry, trolley, and hoist at he crane and each motor is controlled by the matrix converter with direct torque control (DTC). Both the position control algorithm and the supervisor control system using CAN are introduced. Simulation and experimental results are carried out to verify the performance of position control at the matrix converter controlled crane system.
The Stabilization Model of Receive Sensitivity of Thick Film Oscillation Circuit for Air Explosion Shell
Lim, Young-Cheol ; Kim, Kwan-Woo ; Choi, Jin-Bong ; Jung, Young-Gook ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 17~26
DOI : 10.6113/TKPE.2010.15.1.17
This paper proposes the stabilization modelling method of receive sensitivity of thick film oscillation circuit for air explosion shell. The proposed method minimizes the errors of the thick film oscillator which uses air explosion shell for military and it is very similar to the simulation for maximizing the efficiency. Firstly, the proposed method gets the equation of new form through statistical analysis from the data which shows always fixed and stabilized output from the real model. Secondly, the simulation is designed which is possible to predict the output, after optimization that is a model to match the each electronic component output by the equation. In a conclusion, the usefulness, the accuracy and the precision are proved as compared with the output data of real model.
Water Cooling Pipe Structure for Heat-Dissipation of HEV Inverter System
Kim, Gyoung-Man ; Woo, Byung-Guk ; Lee, Yong-Hwa ; Kang, Chan-Ho ; Chun, Tae-Won ; Cho, Kwan-Yuhl ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 27~34
DOI : 10.6113/TKPE.2010.15.1.27
To dissipate the heat generated from the switching devices in the inverter system of HEV, the water cooling structure is proposed. The bolt type cooling structure has a problem such as water leakage for high pressure of water, therefore the proposed cooling structure applied pipe structure in the heat sink. The heat dissipation characteristics for various structures of water channel and distance between heat source and water channel was analyzed through the simulation. heat dissipation effect for two types of water cooling structures was investigated. Based on the simulation results, two types of water cooling system for 30kW inverter system of HEV were manufactured and the heat dissipation effect was verified.
A High Efficiency LED Driver Circuit using LLC Resonant Converter
Shin, Dae-Seong ; Jung, Young-Jin ; Hong, Sung-Soo ; Han, Sang-Kyu ; Jang, Byung-Jun ; Kim, Jong-Hae ; Lee, Il-Oun ; Roh, Chung-Wook ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 35~42
DOI : 10.6113/TKPE.2010.15.1.35
This paper presents the Two-stage LED Driving system using LLC resonant converter for LED lighting application. Due to the existence of the nonisolation DC/DC converter to control the LED current and the light intensity, the conventional three-stage LED Driving system has the problem of low power conversion efficiency. To solve this problem, a novel scheme without any nonisolation DC/DC converter is proposed, in which, the isolated DC/DC converter, e.g., LLC resonant converter in the paper, can perform the LED current control and stage, e.g., PFC stage and LLC stage, the efficiency can be significantly improved. Moreover, the cost and the volume of the whole LED driving system can be reduced compared to those of the conventional ones. The operational principle and the characteristics of the proposed scheme are presented. The proposed scheme is verified experimentally with a 45W output prototype LED driver.
Analysis of Voltage Delay and Compensation for Current Control in H-Bridge Multi-Level Inverter
Park, Young-Min ; Ryu, Han-Seong ; Lee, Hyun-Won ; Jung, Myung-Gil ; Lee, Se-Hyun ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 43~51
DOI : 10.6113/TKPE.2010.15.1.43
This paper proposes an analysis of voltage delay and compensation for current control in H-Bridge Multi-Level (HBML) inverters for a medium voltage motor drive with vector control. It is shown that the expansion and modularization capability of the HBML inverter is improved in case of using Phase-Shifted Pulse Width Modulation (PSPWM) since individual inverter modules operate more independently. But, the PSPWM of HBML has a phase difference between reference voltage and real voltage, which can cause instability in the current regulator at high speed where the ratio of the sampling frequency to the output frequency is insufficient. This instability of the current regulator is removed by adding a proposed method which compensate a phase difference between reference voltage and real voltage. The proposed method is suitable for HBML inverter controlled by PSPWM with low switching frequency and high speed motor drive. The validity of the proposed method is verified experimentally on 6,600[V] 1,400[kW] induction motor fed by an 13-level HBML inverter.
Design and Application of PFC Direct Drive Inverter for LCD-TV
Ko, Tae-Seok ; Jung, Yong-Joon ; Hong, Sung-Soo ; Han, Sang-Kyu ; Jang, Byung-Jun ; Jang, Young-Su ; Han, Seung-Ho ; Roh, Chung-Wook ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 52~59
DOI : 10.6113/TKPE.2010.15.1.52
The conventional CCFL (Cold Cathode Fluorescent Lamp) inverter used in the backlight unit for LCD-TV, composed of the three power stage, can degrade the whole power conversion efficiency. In this paper, a novel scheme to drive the CCFL, composed only of the two power stage without using a dc/dc power stage, is proposed to enhance the whole power conversion efficiency. By adopting the proposed "4-in-1 Transformer", the current balance and the simultaneous ignition among the four CCFL lamp are assured with the one inverter circuit. The proposed scheme features the simple circuit structure, which can save the volume and the cost in the LCD backlight unit. Design considerations are discussed and design procedures are derived. Experimental results of the proposed scheme for 40" LCD-TV are presented to confirm the theoretical analysis.
High Frequency Link PCS for Interfacing with Power Utility System
Chung, Bong-Gun ; Yoon, Kwang-Ho ; Lee, Kwang-Ho ; Kim, Eun-Soo ; Cha, In-Su ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 60~68
DOI : 10.6113/TKPE.2010.15.1.60
Recently, Power Conditioning System (PCS) tends to require more compact, higher efficiency and power density with better performance. A novel topology consisted of LLC resonant inverter and Low Frequency (LF) cyclo-converter for connecting to utility line is able to meet these requirements. The technical operating analysis is described and 1kW prototype is tested and verified the performances through connecting the 110Vac 60Hz utility line. Efficient results are described.
Realtime Compensation of PCC Voltage Variation by Injection of Required Reactive Power in a Grid Connected Variable Speed Wind Turbine
Im, Ji-Hoon ; Song, Seung-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 69~74
DOI : 10.6113/TKPE.2010.15.1.69
In a grid connected variable speed wind turbine, the PCC voltage and the wind power fluctuate as the wind velocity changed. And this voltage variation is changed due to location of PCC. This paper calculate the value of PCC voltage variation which is proportional to the product of the line impedance from the ideal generator to the PCC and the wind turbine output current. And to reduce this PCC voltage variation, this paper calculate the required reactive power analytically using the vector diagram method. Output reactive current is changed, if the reactive current is limited by inverter capacity or grid code have the margin of voltage variation. If the grid connected inverter is controlled by proposed algorithm, the PCC voltage variation is minimized though the wind turbine output change at random. To verify calculated voltage variation and required reactive power, this paper utilized Matlab and PSCAD/EMTDC simulation and real small wind turbine and power system in Sapsido, island in the Yellow Sea.
Three-Phase Z-Source Hybrid Active Power Filter System
Lim, Young-Cheol ; Kim, Jae-Hyun ; Jung, Young-Gook ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 1, 2010, Pages 75~85
DOI : 10.6113/TKPE.2010.15.1.75
In this paper, a Z-source hybrid active power filter is proposed to compensate the harmonics and reactive power in power distribution system. The proposed system is composed of a 7th harmonics-tuned passive filter and an active power filter with a Z-source inverter topology, while voltage source PWM inverter or current source PWM inverter are applied as the power converter topology of conventional active power filters. The Z-source impedance network along with shoot through capability would ensure a constant DC voltage across the DC link. A polymer electrolyte membrane fuel cell is employed as an compensation DC energy source of the proposed system and its equivalent R-L-C circuit is modeled for simulation. As the compensation and control algorithm of the proposed system, the current synchronous detection algorithm is applied. The simulation analysis by PSIM is performed under the three-phase 220V/60Hz voltage source and 25A nonlinear diode loads. The effectiveness of the proposed the system is verified in the steady and transient states.