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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 16, Issue 6 - Dec 2011
Volume 16, Issue 5 - Oct 2011
Volume 16, Issue 4 - Aug 2011
Volume 16, Issue 3 - Jun 2011
Volume 16, Issue 2 - Apr 2011
Volume 16, Issue 1 - Feb 2011
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Design of a High Power Three-Phase ZVS Push-Pull Converter
Park, Jun-Sung ; Lee, Sang-Won ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 209~218
DOI : 10.6113/TKPE.2011.16.3.209
In low voltage high current applications such as fuel cells the current-fed DC-DC converter which has small ripple current and turn ratio is more efficient. In the applications larger than 5kW the conventional single-phase current-fed converter based on full-bridge, half-bridge or push-pull topologies has high current burden of devices such as switches, and the selection and optimized design of the devices are not easy. In this paper a three-phase active-clamped current-fed push-pull DC-DC converter suitable for high power high step-up applications is proposed. The proposed converter has reduced current burden and is suitable for wide input voltage applications due to the use of whole duty cycle range. Design methods of main components including three-phase high frequency transformers are provided, and the validity and performance of the proposed converter are proved from a 5kW prototype.
Contactless Power Transfer System using Voltage Phase
Yu, Joo-Hee ; Kim, Choon-Sam ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 219~226
DOI : 10.6113/TKPE.2011.16.3.219
As the existing contactless power transfer system(CPTS) is adopting the principle of contactless transformer enables to supply power in contactless way using RFID(radio frequency identification)/ID communication method between primary and secondary sides of contactless transformer and detect the alien load. Such CPTS requires the circuit that generates ID in addition, and the ID identification and control generated from the secondary side is performed at the primary side, which cuases complexity of the circuit. Therefore, this study suggested the CPTS using voltage phase, and In order to verify the validity of this study, 3[W] class CPTS shall be designed, and the simulation and test of CPTS using current and voltage phases shall be carried out.
Design and Experiment of Three-phase Interleaved DC-DC Converter for 5kW Lead-Acid Battery Charger
Lee, Wu-Jong ; Eom, Ju-Kyoung ; Han, Byung-Moon ; Cha, Han-Ju ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 227~233
DOI : 10.6113/TKPE.2011.16.3.227
This paper proposes a design and experiment of three phase interleaved dc-dc converter for 5kW battery charger. The charger consists of a three-phase interleaved dc-dc converter, which interfaces batteries and DC link, and a grid connected inverter. Lead-acid battery is modeled in a simple R-C model by matlab. Parameters of the battery are estimated based on step current discharging test. The battery is connected to three-phase interleaved DC-DC converter in order to reduce the ripple current to the battery and so, increase the lifetime of battery. Controller for charging and discharging mode is designed and tested in a 5kW charger prototype.
A Simple Static Overmodulation Scheme using Space Vector PWM Method
Lee, Dong-Myung ; Kim, Jin-Ho ; Yang, Hyun-Suk ; Jung, Jin-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 234~241
DOI : 10.6113/TKPE.2011.16.3.234
This paper proposes a simple static overmodulation strategy that extends the linearity of the inverter output voltage. The proposed method obtains the reference vector having the instantaneous value directly from the modulation index based on the magnitude of fundamental voltage, and has a simplified form of phase command. This method does not need trigonometric functions for calculating the magnitude of the reference vector. The magnitude of reference voltage and holding angle in the overmodulation region corresponding to the modulation index are determined in advance to have the same fundamental voltage magnitude by using the result of Fourier series expansion.
Three-Phase ZVS DC-DC Converter with Low Transformer Turn Ratio for High Step-up and High Power Applications
Kim, Joon-Geun ; Park, Chan-Soo ; Choi, Se-Wan ; Park, Ga-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 242~249
DOI : 10.6113/TKPE.2011.16.3.242
The proposed converter has easy device selection for high step-up and high power applications since boost half bridge and voltage doubler cells are connected, respectively, in parallel and series in order to increase output power and voltage. Especially, optimized design of high frequency transformers is possible owing to reduced turn ratio and eliminated dc offset, and distributed power through three cores is beneficial to low profile and thermal distribution. The proposed converter does not necessitate start-up circuit and additional clamp circuit due to the use of whole duty range between 0 and 1 and is suitable for applications with wide input voltage range. Also, high efficiency can be achieved since ZVS turn on of switches are achieved in wide duty cycle range and ZCS turn on and off of diodes are achieved. The proposed converter was validated through 5 kW prototype.
Generalized Circulating Current Control Method in Parallel Three-Phase Boost Converters
Lim, Chang-Soon ; Lee, Kui-Jun ; Kim, Rae-Young ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 250~257
DOI : 10.6113/TKPE.2011.16.3.250
This paper analyzes characteristic of the three-phase coupled inductor connected to ac source to effectively mitigate the high-frequency circulating current generated in parallel three-phase boost converters. The three-phase coupled inductor analysis presented in this paper uses the three-phase coupled inductor structure and voltage equations. Based on this analysis, the three-phase coupled inductor is added to the conventional low-frequency averaged model. As a result, the novel averaged model which can reduce the low and high-frequency circulating current simultaneously is developed. Using the zero-sequence component of the novel averaged model, each total inductance to the circulating current of the three-phase coupled inductor and line inductor can be obtained. Simulation and experiment results verify the usefulness of three-phase coupled inductor in parallel three-phase boost converters.
Air-pressure Control of Diaphragm using Variable Frequency Current Control
Lim, Geun-Min ; Lee, Dong-Hee ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 258~265
DOI : 10.6113/TKPE.2011.16.3.258
This paper presents a variable frequency current control scheme for the air-pressure control of diaphragm. Differ from the conventional air-pressure control of diaphragm, the proposed method uses a single-phase inverter to control the phase current and frequency. The phase current is adjusted to keep the reference air-pressure of the diaphragm. And the current frequency is changed to reduce the mechanical vibration. In order to smooth change of the operation with a constant air-pressure, the frequency is changed according to the voltage reference from the current controller. When the phase current is satisfied to the constant air-pressure, the current frequency is increased to reduce the vibration of the diaphragm. When the reference voltage to keep the phase current is over than the set value, the current frequency is decreased to keep the air-pressure. The proposed control scheme is verified by the experimental test of a commercial diaphragm.
Sensorless Control Strategy of IPMSM Based on a Parallel Reduced-Order Extended Kalman Filter
Yim, Dong-Hoon ; Park, Byoung-Gun ; Kim, Rae-Young ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 266~273
DOI : 10.6113/TKPE.2011.16.3.266
This paper proposes a novel sensorless control scheme for a Permanent Magnet Synchronous Motor (PMSM) by using a parallel reduced-order Extended Kalman Filter. The proposed scheme can obtain rotor position and speed by back-EMF that is estimated by reduced-order EKF and save computation time greatly due to using a parallel structure that works by turns every sampling time. Therefore, proposed scheme has merits of conventional EKF, and problems of parameter sensitivity are partially overcome. And proposed scheme can safely estimate rotor speed and position by using new algorithms according to driving regions. Experimental results show the validity of the proposed estimation technique, and to verify the merit of the proposed scheme, a comparison of a new reduced-order EKF algorithm with a conventional EKF algorithm has been also made in terms of computation time.
Ultra Slim U-I & W-I Primary and Pick-up Coil Design for OLEV
Lee, Sung-Woo ; Park, Chang-Byung ; Cho, Jung-Goo ; Cho, Gyu-Hyeong ; Rim, Chun-Taek ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 274~282
DOI : 10.6113/TKPE.2011.16.3.274
The ultra slim U-I and W-I primary and pick-up coils for OLEV (On-Line Electric Vehicles) are proposed. With the proposed structures, the amount and the cost of the core are dramatically reduced. Not only air gap but also the lateral displacement are improved. The proposed structures are applied to the OLEV bus and SUV, which achieve 83% efficiency at 17cm air gap with more than 60kW output power, and the construction cost is lower than ￦300M/km. The proposed coil structures are verified with simulations and experiments.
Single Phase 5-level Inverter with DC-link Switches
Choi, Young-Tae ; Sun, Ho-Dong ; Park, Min-Young ; Kim, Heung-Geun ; Chun, Tea-Won ; Nho, Eui-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 283~292
DOI : 10.6113/TKPE.2011.16.3.283
This paper proposed a new multi-level inverter topology based on a H-bridge with two switches and two diodes connected to the DC-link. The output voltage of the proposed topology is quite closer to a sinusoidal waveform compared with a typical single phase inverter. The proposed multi-level inverter is applicable to a power conditioning system for renewable energy sources, and it can be also used as a building block of a cascaded multi-level inverter for a high voltage application. In case of conventional H-bridge type or NPC type multi-level inverter, 8 controllable switches are used to obtain a 5 level output voltage, but the proposed multi-level inverter requires only 6 controllable switches. Thus the circuit configuration is quite simple, reliable and cost-effective implementation is possible. The efficiency can be improved owing to the reduction of the switching loss. A new PWM method based on POD modulation is suggested which requires only one carrier signal. The switching sequence to make the capacitor voltage balanced is also considered. The feasibility is studied through simulation and experiment.
A Bridgeless Half-Bridge AC-DC Converter with High-Efficiency
Choi, Woo-Young ; Yoo, Ju-Seung ; Choi, Jae-Yeon ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 293~301
DOI : 10.6113/TKPE.2011.16.3.293
This paper proposes a bridgeless half-bridge AC-DC converter with high-efficiency. The proposed converter integrates the bridgeless power factor correction (PFC) circuit with the asymmetrical pulse-width modulated (APWM) half-bridge DC-DC converter. It provides the isolated DC output voltage from the AC line voltage without using any full-bridge diode rectifier. Conduction losses are lowered with a simple circuit structure. Switching losses are also reduced by achieving zero-voltage switching (ZVS) of the power switches. By using series-connected two transformers, the proposed converter provides a low-profile and high power density for AC-DC converters. The performance of the proposed converter is verified from a 250 W (48 V / 5.2 A) experimental prototype circuit at
Development of the Inverter System with UPS Function for the Air-Conditioning Blower
Lim, Seung-Beom ; Lee, Yun-Ha ; Mok, Hyung-Soo ; Ji, Jun-Keun ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 3, 2011, Pages 302~308
DOI : 10.6113/TKPE.2011.16.3.302
The HVAC(Heating Ventilation and Air Conditioning) system is only controlled by turn on/turn off operations with AC 380V input. Therefore, the efficiency of the system is reduced and accoustic noise problem occurs. Also, the blower is shut down at the AC power failure. In this paper, the inverter system with UPS function for the A/C(Air Conditioning) blower is proposed. Proposed inverter system which is powered from the AC and DC voltage can control speed, operation mode, and soft-start time using CAN communication. In case of the CAN communication failure, RS-232 communication could be used to control the hardware directly by the engineer that can solve existing problems. To verify the validity of proposed inverter system, simulations and experiments are carried out.