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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 12, Issue 6 - Nov 2012
Volume 12, Issue 5 - Sep 2012
Volume 12, Issue 4 - Jul 2012
Volume 12, Issue 3 - May 2012
Volume 12, Issue 2 - Mar 2012
Volume 12, Issue 1 - Jan 2012
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Self-Oscillating Switching Technique for Current Source Parallel Resonant Induction Heating Systems
Namadmalan, Alireza ; Moghani, Javad Shokrollahi ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 851~858
DOI : 10.6113/JPE.2012.12.6.851
This paper presents resonant inverter tuning for current source parallel resonant induction heating systems based on a new self oscillating switching technique. The phase error is suppressed in a wide range of operating frequencies in comparison with Phase Locked Loop (PLL) techniques. The proposed switching method has the capability of tuning under fast changes in the resonant frequency. According to this switching method, a multi-frequency induction heating (IH) system is proposed by using a single inverter. In comparison with multi-level inverter based IH systems, the advantages of this technique are its simple structure, better transients and wide range of operating frequencies. A laboratory prototype was built with an operating frequency of 35 kHz to 55 kHz and 300 W of output power. The performance of the IH system shows the validity of the new switching technique.
Analysis of a Novel Soft Switching Bidirectional DC-DC Converter
Eom, Ju-Kyoung ; Kim, Jun-Gu ; Kim, Jae-Hyung ; Oh, Soon-Tack ; Jung, Yong-Chae ; Won, Chung-Yuen ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 859~868
DOI : 10.6113/JPE.2012.12.6.859
In this paper, a novel bidirectional DC-DC converter employing soft switching technique was proposed. Compare to conventional bidirectional converters, the main switches of proposed converter are operated without switching losses. Moreover, auxiliary switches are used, and the switches are operated under zero voltage switching (ZVS) and zero current switching (ZCS) condition. To verify the validity of the proposed converter, mode analysis, design procedure, simulation and experimental results are presented.
Design and Implementation of a Current-balancing Circuit for LED Security Lights
Jung, Kwang-Hyun ; Yoo, Jin-Wan ; Park, Chong-Yeun ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 869~877
DOI : 10.6113/JPE.2012.12.6.869
This paper presents a current-balancing circuit for security lights that uses parallel-connected LEDs. The parallel connection of LEDs causes current differences between the LED strings because of characteristic deviations. These differences can reduce the lifespan of a particular point of LEDs by thermal spotting. They can also cause non-uniform luminance of the lighting device. Among the different methods for solving these problems, the method using current-balancing transformers makes it easy to compensate for current differences and it has a simple circuitry. However, while the balancing transformer has been applied to AC light sources, LEDs operate on a DC source, so the driving circuitry and the design method have to be changed and their performances must be verified. Thus in this paper, a design method of the balancing transformer network and the driving circuitry for LEDs is proposed. The proposed design method could have a smaller size than the conventional design method. The proposed circuitry is applied to three types of 100-watt LED security lights, which use different LEDs. Experimental results are presented to verify the performance of the designed driving circuits.
Integrated DC-DC Converter Based Energy Recovery Sustainer Circuit for AC-PDP
Park, Jae-Sung ; Shin, Yong-Saeng ; Hong, Sung-Soo ; Han, Sang-Kyoo ; Roh, Chung-Wook ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 878~885
DOI : 10.6113/JPE.2012.12.6.878
A new sustainer with primary-side integration of DC/DC converters and energy recovery(SPIDER) circuits is proposed. The proposed circuit operates as a DC-DC converter during address period and energy recovery circuit during sustain period. Therefore, the conventional three electronic circuits composed of the power supply, X-driver, and Y-driver can be reduced to one circuit. As a result, it has desirable advantages such as a simple structure, less mass, fewer devices and cost reduction. Moreover, since the Zero Voltage Switching (ZVS) of all power switches can be guaranteed, a switching loss can be considerably decreased. To confirm the operation, validity, and features of the proposed circuit, experimental results from a prototype for 42-inch PDP are presented.
A Dual-Output Integrated LLC Resonant Controller and LED Driver IC with PLL-Based Automatic Duty Control
Kim, HongJin ; Kim, SoYoung ; Lee, Kang-Yoon ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 886~894
DOI : 10.6113/JPE.2012.12.6.886
This paper presents a secondary-side, dual-mode feedback LLC resonant controller IC with dynamic PWM dimming for LED backlight units. In order to reduce the cost, master and slave outputs can be generated simultaneously with a single LLC resonant core based on dual-mode feedback topologies. Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) schemes are used for the master stage and slave stage, respectively. In order to guarantee the correct dual feedback operation, Phased-Locked Loop (PLL)-based automatic duty control circuit is proposed in this paper. The chip is fabricated using
Bipolar-CMOS-DMOS (BCD) technology, and the die size is
. The frequency of the gate driver (GDA/GDB) in the clock generator ranges from 50 to 425 kHz. The current consumption of the LLC resonant controller IC is 40 mA for a 100 kHz operation frequency using a 15 V supply. The duty ratio of the slave stage can be controlled from 40% to 60% independent of the frequency of the master stage.
Fast Switching Direct Torque Control Using a Single DC-link Current Sensor
Wang, Wei ; Cheng, Ming ; Wang, Zheng ; Zhang, Bangfu ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 895~903
DOI : 10.6113/JPE.2012.12.6.895
This paper presents a fast switching direct torque control (FS-DTC) using only a single DC-link current sensor. In FS-DTC, six new active voltage complex space vectors (CSVs) are synthesized by the conventional active voltage space vectors (SVs). The corresponding sectors are rotated in the anticlockwise direction by 30 degrees. A selection table is defined to select the CSVs. Based on the "Different Phase Mode", the output sequence of the selected CSV is optimized. Accordingly, a reconstruction method is proposed to acquire the phase currents. The core of the FS-DTC is that all of the three phase currents can be reliably reconstructed during every two sampling periods, which is the result of the fast switching between different phases. The errors between the reconstructed and actual currents are strictly limited in one sampling period. The FS-DTC has the advantages of the standard DTC scheme such as simple structure, quick torque response and robustness. As can be seen in the analysis, the FS-DTC can be thought of as an equivalent standard DTC scheme with 86.6% of the maximum speed, 173.2% of the torque ripple, and 115% of the response time of the torque. Based on a dSPACE DS1103 controller, the FS-DTC is implemented in an induction machine drive system. The results verify the effectiveness of the FS-DTC.
Implementation of a Robust Fuzzy Adaptive Speed Tracking Control System for Permanent Magnet Synchronous Motors
Jung, Jin-Woo ; Choi, Han Ho ; Lee, Dong-Myung ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 904~911
DOI : 10.6113/JPE.2012.12.6.904
This paper presents a fuzzy adaptive speed controller that guarantees a fast dynamic behavior and a precise trajectory tracking capability for surfaced-mounted permanent magnet synchronous motors (SPMSMs). The proposed fuzzy adaptive control strategy is simple and easy to implement. In addition, the proposed speed controller is very robust to system parameter and load torque variations because it does not require any accurate parameter values. The global stability of the proposed control system is analytically verified. To evaluate the proposed fuzzy adaptive speed controller, both simulation and experimental results are shown under motor parameter and load torque variations on a prototype SPMSM drive system.
Modeling and Regulator Design for Three-Input Power Systems with Decoupling Control
Li, Yan ; Zheng, Trillion Q. ; Zhao, Chuang ; Chen, Jiayao ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 912~924
DOI : 10.6113/JPE.2012.12.6.912
In hybrid renewable power systems, the use of a multiple-input dc/dc converter (MIC) leads to simpler circuit and lower cost, when compared to the conventional use of several single-input converters. This paper proposed a novel three-input buck/boost/buck-boost converter, which can be used in applications with various values of input voltage. The energy sources in this converter can deliver power to the load either simultaneously or individually in one switching period. The steady relationship, the power management strategy and the small-signal circuit model of this converter have been derived. With decoupling technology, modeling and regulator design can be obtained under multi-loop control modes. Finally, three generating methods of a multiple-input buck/boost/buck-boost converter is given, and this method can be extended to the other multiple-input dc/dc converters.
Novel Third Harmonic Current Injection Technique for Harmonic Reduction of Controlled Converters
Eltamaly, Ali M. ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 925~934
DOI : 10.6113/JPE.2012.12.6.925
Three-phase controlled converters have many applications in the utility interfacing of renewable energy sources and adjustable speed drives as a rectifier or inverter. The utility line currents of these converters have a high harmonic distortion, which is more than the harmonic standards. This paper introduces a new technique for circulating the third harmonic currents from the dc-link to the line currents to reduce their harmonic contents. The proposed system uses a single-phase PWM converter to control the angle and amplitude of the injection current for each of the firing angle of a three-phase converter. A detailed analysis is introduced to achieve a relationship between the firing angle of the three-phase controlled converter and the power angle of the PWM converter. In addition, a detailed design for the other injection path components is introduced. A simulation and experimental work is introduced to prove the mathematical derivations. Analysis, simulation and experimental results prove the superiority of the proposed technique.
Control Strategy and Characteristic Analysis of Hybrid Active Power Filters with the Resonant Impedance Principle
Fang, Lu ; Xu, Xian-Yong ; Luo, An ; Li, Yan ; Tu, Chun-Ming ; Fang, Hou-Hui ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 935~946
DOI : 10.6113/JPE.2012.12.6.935
A new kind of resonant impedance type hybrid active filter (RITHAF) is proposed for dynamic harmonic current suppression and high capacity reactive compensation in medium and high voltage systems. This paper analyzed the different performance of the RITHAF when the active part of the RITHAF is controlled as a current source and as a voltage source, respectively. The harmonic suppression function is defined in this paper. The influences of the changes caused by the grid impedance and the detuning of the passive power filter on the compensating characteristics of the RITHAF are studied by analyzing the suppression function. Simulation and industrial application results show that the RITHAF has excellent performances in harmonic suppression and reactive compensation, which is suitable for medium and high voltage systems.
Electrical Characteristics and Thermal Reliability of Stacked-SCRs ESD Protection Device for High Voltage Applications
Koo, Yong Seo ; Kim, Dong Su ; Eo, Jin Woo ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 947~953
DOI : 10.6113/JPE.2012.12.6.947
The latch-up immunity of the high voltage power clamps used in high voltage ESD protection devices is very becoming important in high-voltage applications. In this paper, a stacking structure with a high holding voltage and a high failure current is proposed and successfully verified in 0.18um CMOS and 0.35um BCD technology to achieve the desired holding voltage and the acceptable failure current. The experimental results show that the holding voltage of the stacking structure can be larger than the operation voltage of high-voltage applications. Changes in the characteristics of the stacking structure under high temperature conditions (300K-500K) are also investigated.
Applications of MEMS-MOSFET Hybrid Switches to Power Management Circuits for Energy Harvesting Systems
Song, Sang-Hun ; Kang, Sungmuk ; Park, Kyungjin ; Shin, Seunghwan ; Kim, Hoseong ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 954~959
DOI : 10.6113/JPE.2012.12.6.954
A hybrid switch that uses a microelectromechanical system (MEMS) switch as a gate driver of a MOSFET is applied to an energy harvesting system. The power management circuit adopting the hybrid switch provides ultralow leakage, self-referencing, and high current handling capability. Measurements show that solar energy harvester circuit utilizing the MEMS-MOSFET hybrid switch accumulates energy and charges a battery or drive a resistive load without any constant power supply and reference voltage. The leakage current during energy accumulation is less than 10 pA. The power management circuit adopting the proposed hybrid switch is believed to be an ideal solution to self-powered wireless sensor nodes in smart grid systems.
Simplified 2-D Analytical Model for Winding Loss Analysis of Flyback Transformers
Zhang, Junming ; Yuan, Wei ; Zeng, Hulong ; Qian, Zhaoming ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 960~973
DOI : 10.6113/JPE.2012.12.6.960
The winding loss analysis of a flyback transformer is difficult and ambiguous because the primary side current and the secondary side current differs both in shape and phase, especially for DCM (Discontinuous Conduction Mode) operation. Meanwhile, the fringing field caused by the air gaps further makes the traditional 1-D loss analysis model not directly applicable. The paper gives a thorough investigation into the phase shift of winding currents, which indicates that the phase shift of the high order harmonics is still close to
out-of-phase. Based on the analysis, a simplified 2-D winding loss analytical model for flyback transformers considering the effects of low order harmonics is proposed. By neglecting the y components of the fringing field, the proposed model has an acceptable accuracy and a simple form that is similar to the conventional 1-D model. The power loss calculated with the proposed analysis model is verified by FEA (Finite Element Analysis) simulations and experimental results.
Design of an FPGA Based Controller for Delta Modulated Single-Phase Matrix Converters
Agarwal, Anshul ; Agarwal, Vineeta ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 974~981
DOI : 10.6113/JPE.2012.12.6.974
A FPGA based delta modulated single phase matrix converter has been developed that may be used in both cyclo-converters and cyclo-inverters. This converter is ideal for variable speed electrical drives, induction heating, fluorescent lighting, ballasts and high frequency power supplies. The peripheral input-output and FPGA interfacing have been developed through Xilinx 9.2i, to generate delta modulated trigger pulses for the converter. The controller has been relieved of the time consuming computational task of PWM signal generation by implementing the method of trigger pulse generation in a FPGA by using Hardware Description Language VHDL in Xilinx. The trigger circuit has been tested qualitatively by observing various waveforms on an oscilloscope. The operation of the proposed system has been found to be satisfactory.
Detection of Rotor Bar Faults in Field Oriented Controlled Induction Motors
Akar, Mehmet ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 982~991
DOI : 10.6113/JPE.2012.12.6.982
In this study, a new method has been presented for the detection of broken rotor bar (BRB) faults in inverter driven induction motors controlled via Field Oriented Control (FOC). To this end, a FOC controlled induction motor with a BRB fault was modeled using the Matlab/Simulink program. Experiments were carried out using the prepared simulation model at various loads and operating speeds. The motor current and speeds were monitored for healthy, 1, 2 and 3 BRB faults. The Resampling Based Order Tracking Analysis (RB-OTA) method was applied to the monitored signals. The obtained results were compared by using the classic Fast Fourier Transform (FFT) method. When the obtained results were analyzed via the FFT method no information regarding any faults was determined in the run up or run down regions of the motor and the presented method gave very good results. The reliability of the proposed method was validated with experimental results. The main innovative part of this study is that the RB-OTA method was implemented on the induction motor current signal for detecting BRB faults.
Driving Performance Experimental Analysis of Series Chopper Based EV Power Train
Kawamura, Atsuo ; Guidi, Giuseppe ; Watanabe, Yuki ; Tsuruta, Yukinori ; Motoi, Naoki ; Kim, Tae-Woong ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 992~1002
DOI : 10.6113/JPE.2012.12.6.992
In this paper, the series chopper based power train for electric vehicle is proposed for aiming the increase of one battery charge driving distance. Both the motor test bench based experiments and the chassis dynamo based experiments are tested and then analyzed for EV driving performance that the proposed power train with SAZZ chopper and Quasi-PAM control scheme is compared with or without the series chopper. It is confirmed through two kinds of experimental analyses that the series chopper power train for EV can be useful to extend the driving distance if the high efficiency and the low weight of chopper are satisfied.
Active Mechanical Vibration Control of Rotary Compressors for Air-conditioning Systems
Park, Cheon-Su ; Kim, SeHwan ; Park, Gwi-Geun ; Seok, Jul-Ki ;
Journal of Power Electronics, volume 12, issue 6, 2012, Pages 1003~1010
DOI : 10.6113/JPE.2012.12.6.1003
Recent power electronics and variable-frequency motor drive technologies have been applied to air conditioners to improve efficiency and power density. However, the mechanical vibrations and acoustic noise resulting from the compressor still remain as a serious problem. This paper presents the development and implementation of an online disturbance state-filter for the suppression of multiple unknown and time-varying vibrations of air conditioning systems. The proposed design has a form of the state-filter based on a Luenburger-style closed-loop speed observer. An active vibration decoupling strategy with an estimated disturbance is provided, which manipulates a motor torque command. Since the proposed estimation does not require any additional transducers or hardware for obtaining real-time information upon disturbances, it is suitable for retrofitting industrial air conditioners.