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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 14, Issue 6 - Dec 2009
Volume 14, Issue 5 - Oct 2009
Volume 14, Issue 4 - Aug 2009
Volume 14, Issue 3 - Jun 2009
Volume 14, Issue 2 - Apr 2009
Volume 14, Issue 1 - Feb 2009
Selecting the target year
A Study on the Gain Characteristics of Multi-output LLC Series Resonant Converter
Lee, Jae-Sam ; Park, Jun-Ho ; Huh, Dong-Young ; Kang, Seong-In ; Kim, Joo-Hoon ; Kim, Eun-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 177~187
This paper describes the gain characteristics of Multi-output LLC series resonant converter by using the new analytical method. Specially, using the Math-CAD simulated result, this paper analyzes an influence from the secondary leakage inductance of transformer. The theoretical results are verified through an experimental prototype of the 430W 3-output LLC resonant converter for 46inch PDP power module.
Development of the Improved Dynamic Model of the Supercapacitor Considering Self-Discharge
Kim, Sang-Hyun ; Lee, Kyo-Beum ; Choi, Se-Wan ; Choi, Woo-Jin ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 188~196
Due to its high power density, long cycle life and clean nature supercapacitors are widely used for improving the dynamic characteristics of the new and renewable energy sources and extending the battery run-time and life. In this paper improved dynamic model of the supercapacitor is developed by the electrochemical impedance spectroscopy technique. The developed model can be used to accurately estimate the dynamic behaviour of the supercapacitor and calculate the exact capacitance value at a certain state of charges. The model of the supercapacitor in the frequency domain is equivalently transformed into that in the time domain for Matlab/Simulink simulaton. The simulation data shows fine agreements with experimental results, thereby proving the validity and the accuracy of the developed model.
Magnetization Fault Diagnosis of Concentrated Winding BLDC Motors for Compressor
Lee, Kwang-Woon ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 197~203
This paper presents a novel method to diagnose magnetization faults produced during magnetization process using stator coils of a brushless dc motor with concentrated windings. It is demonstrated that the stator coil magnetization faults can cause a drop of energy efficiency of the brushless dc motor through computer simulations using a magnetization fault model and efficiency test using compressors. The proposed method diagnoses the stator coil magnetization faults by using an inverter during the brushless dc motor driving test after the magnetization process is completed. An experimental study on the brushless dc motor for compressor shows that the stator coil magnetization faults can be detected with high sensitivity.
Current-Sensorless Maximum Torque per Ampere Control for a Surface Mounted Permanent Magnet Synchronous Motor with Low-Resolution Position Sensor
Lee, Kwang-Woon ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 204~210
This paper proposes a novel current-sensorless maximum torque per ampere control for a surface mounted permanent magnet synchronous motor with low-resolution position sensor. A direct axis current is estimated from the mathematical model of the permanent magnet synchronous motor and the phase angle between direct and quadrature axis voltage commands is controlled to adjust the estimated direct axis current to zero, thus a maximum torque per ampere control can be achieved. The proposed method is suitable for low cost applications with slow dynamic response characteristics.
Soft Switching Boost Converter using a Single Switch
Jung, Doo-Yong ; Kim, Jae-Hyeng ; Ji, Young-Hyok ; Won, Chung-Yuen ; Jung, Yong-Chae ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 211~219
In this paper, a detailed analysis of zero current or zero voltage switching boost converter using a single switch is described. The proposed topology is capable of decreasing switching loss of IGBT device using soft switching technique. As a results, it can be reduced size and weight of passive elements. Based on the mode analysis, practical design considerations are presented. We confirm the converter topology, principle of operation and simulation results obtained from the PSIM software. The performance of the proposed converter is verified by with 1kW(400V, 2.5A) prototype circuit operated at 30kHz.
Self Oscillation DC/DC Converter with High Voltage Step Up Ratio
Jung, Yong-Joon ; Han, Sang-Kyoo ; Hong, Sung-Soo ; Roh, Chung-Wook ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 220~227
A self oscillation DC/DC converter which has a very desirable characteristics of the high input-output voltage conversion ratio for high voltage DC power supply applications is proposed in this paper. The proposed converter is composed of one power switch, one inductor, several capacitors and diodes. Compared with conventional high-voltage DC/DC converters, it performs the high- voltage power conversion using the inductor instead of the bulky step-up transformer. Therefore, it can reduce the size of magnetic device and save the cost. Moreover, since it needs no control IC by using self oscillation circuit and has lower voltage stress on output diodes, it features a lower cost, simpler structure and more improved performance. Finally, a comparative analysis and experimental results are presented to show the validity of the proposed converter.
A Study on the Power Losses and Conversion Efficiency Analysis for the Phase-Shift Controlled Full-Bridge Converter
Ahn, Tae-Young ; Bong, Sang-Cheol ; Heo, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 228~234
In this paper, we present an analytical method that provides fast and efficient evaluation of the power losses and the conversion efficiency for phase-shift controlled full-bridge converter. In the proposed method, the conduction losses are evaluated by calculating the effective values of the ideal current waveform first and incorporating them into an exact equivalent circuit model of the phase-shift controlled full-bridge converter that includes all the parasitic resistances of the circuit components. While the conduction losses are accurately accounted for the synchronous rectification, the core losses are assumed to be negligible in order to simplify the analysis. The validity and accuracy of the proposed method are verified with experiments on a prototype phase-shift controlled full-bridge converter. An excellent correlation between the experiments and theories are obtained for the input voltages of 400V, output voltage 12V and maximum power 720W.
A New Asymmetrical PWM Bidirectional Half Bridge Converter for Wide Input Voltage Range Applications
Kim, Jeong-Geun ; Choi, Se-Wan ; Park, Rae-Kwan ; Chang, Seo-Geon ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 235~242
In this paper a new asymmetrical PWM bidirectional half bridge converter is proposed. The proposed converter has simple structure and wide duty cycle range, and therefore is suitable for applications such as fuel cells which have wide voltage variation. With the proposed asymmetrical PWM method the current rating of switch and transformer is significantly reduced compared to the conventional phase angle control method, and ZVZCS and synchronous rectification can also be achieved. This could result in high efficiency and high power density. The proposed converter is analytically compared to the conventional converter, and the proposed method was validated through the experiment.
New LED Driver Circuit to Reduce Voltage Stress
Park, Kyu-Min ; Lee, Kwang-Il ; Hong, Sung-Soo ; Han, Sang-Kyoo ; Roh, Chung-Wook ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 243~250
This paper provides an novel two-stage LED driver circuit for LED lighting equipment. The proposed driver circuit reduces voltage stress in LED driver circuit by using multi-level output voltage of PFC flyback converter. The proposed circuit satisfies IEC61000-3-2 class C regulation that is applied to lighting equipment over 25W and uses PWM to control brightness of wide extent. In this paper, the principle of proposed driver circuit is presented. A prototype has been built and tested. The experimental results are presented to show the validity of the proposed circuit.
A Contactless Power Charging System using Half-Bridge Series Resonant Converter
Kim, Joo-Hoon ; Song, Hwan-Kook ; Kim, Eun-Soo ; Park, Sung-Ho ; Kim, Yoon-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 3, 2009, Pages 251~259
In this paper, a contactless power supply using half-bridge series resonant converter that achieves ZVS operation of main switches and ZCS operation of secondary side diodes is proposed. Since the proposed contactless power supply using half-bridge series resonant converter operates with lower switching frequency than the resonant frequency, it can achieve ZCS operation of secondary side diodes due to discontinuous resonant current. And it is also possible to control the converter in narrow frequency range and to obtain high voltage gain, which, in turn, offers low turns ratio for the transformer and high efficiency. Based on the theoretical analysis and simulation results, the 3.15W prototype is built and the final experimental results are described.