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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 21, Issue 4 - Aug 2016
Volume 21, Issue 3 - Jun 2016
Volume 21, Issue 2 - Apr 2016
Volume 21, Issue 1 - Feb 2016
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High Power Density 50kW Bi-directional Converter for Hybrid Electric Vehicle HDC
Yang, Jung-Woo ; Keum, Moon-Hwan ; Choi, Yoon ; Han, Sang-Kyoo ; Kim, Seok-Joon ; Kim, Sam-Gyun ; Kim, Jong-Pil ; Sakong, Suk-Chin ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 95~101
DOI : 10.6113/TKPE.2016.21.2.95
This paper proposed a high-power density bidirectional converter for hybrid electric vehicle high-voltage DC-DC converter(HDC). The conventional HDC has two disadvantages. First, large inductance is required to satisfy the ripple current of inductor by low switching frequency (<20 kHz). Second, large core size is required to prevent the saturation of inductor by high current. Compared with the conventional HDC, the proposed HDC can reduce inductance with SiC-FET for high frequency driving. High-power density of I/O capacitors can be achieved through two-phase interleaved method. The high-power density of inductors can be achieved because the offset current of magnetizing inductance is theoretically terminated by using the differential mode coupled inductor instead of using two single inductors. The validity of the proposed converter is proved through the 50 kW prototype.
High Frequency Dual Mode Control LLC Resonant Converter with Wide Input Voltage Range
Joo, Hyung-Ik ; Yang, Jung-Woo ; Jo, Kang-Ta ; Han, Sang-Kyoo ; Sakong, Suk-Chin ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 102~110
DOI : 10.6113/TKPE.2016.21.2.102
In this paper, a high-frequency dual mode control LLC resonant converter with wide input voltage range is proposed through zero voltage switching (ZVS) under the universal line input voltage and every load conditions. Conventional small power adapter driving should be satisfied with universal line input voltage because it has no power factor correction circuit regulation. The conventional LLC resonant converter for an adapter can reduce the size of transformer in terms of high-frequency driving and ZVS. However, this converter has a disadvantage in terms of design of resonant tank under various input voltages because the frequency modulation range is very wide to satisfy voltage conversion gain. Compared with the conventional one, the proposed LLC converter can be adapted to universal line input voltage and high-frequency driving because it is controlled by pulse width modulation and pulse frequency modulation with control voltage. The validity of the proposed LLC converter is proved through the 60 W prototype.
High Frequency (MHz) LLC Resonant Converter for a Capacitor Coupling Wireless Power Transfer (CCWPT)
You, Young-Soo ; Moon, HyunWon ; Yi, Kang-Hyun ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 111~116
DOI : 10.6113/TKPE.2016.21.2.111
This paper proposes a high-frequency (MHz) LLC resonant converter for a capacitor coupling wireless power transfer (CCWPT). The CCWPT uses electric field in the coupling capacitor between the transmitter and receiver electrodes with a dielectric layer. Given that capacitance is very small and the impedance is large, transferring power with a simple series resonance is difficult. Therefore, the high frequency (MHz) and high Q factor LLC converter is proposed to reduce the impedance of the coupling capacitance and to obtain a high output voltage. This paper deals with the operation analysis of the proposed LLC converter and a theoretical capacitance estimation. The operation and features of the proposed CCWPT LLC converter is verified with a 4.2 W prototype for charging mobile devices.
Inverter Losses Reduction for Rectangular Drive BLDCM using Synchronous Rectification
Nam, Myung-Joon ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 117~125
DOI : 10.6113/TKPE.2016.21.2.117
In this paper, the inverter switch losses of BLDC motor for three types of PWM methods and power devices were analyzed. When the BLDC motor is driven at low currents, the inverter switch losses for MOSFET are low because MOSFET operates like resistance. However, the inverter switch losses for IGBT are higher than MOSFET due to its large turn-off losses. Moreover, synchronous rectification switching method is adaptable because MOSFET has 2-channel. So, MOSFET can be driven with more low impedance and losses. For low power inverter with MOSFET, the power losses of unified PWM are lower than that of unipolar and bipolar PWM. Proposed method and losses analysis results are verified by examination and simulation using Matlab/Simulink.
Carrier Comparison PWM Method of Vienna Rectifier for Reduction of Common Mode Voltage
Lee, Dong-Hyun ; Choi, Won-Il ; Hong, Chang-Pyo ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 126~133
DOI : 10.6113/TKPE.2016.21.2.126
This paper proposes a new PWM method to reduce the common mode voltage change in three-level Vienna rectifier. This new proposed PWM method uses medium voltage vector for the three-level Vienna rectifier to determine the sum of three-phase voltage zero, and the common mode voltage variation is decreased. Using the carrier comparison method, the switching function generator for three-level Vienna rectifier has been proposed. The effects of the proposed PWM method have been verified through simulation using the PSIM.
A Novel Asymmetrical Half-type IPM BLDC Motor Structure for Reducing Torque Ripple
Sim, Yosub ; Niguchi, Noboru ; Hirata, Katsuhiro ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 134~143
DOI : 10.6113/TKPE.2016.21.2.134
This paper proposes a novel asymmetrical interior permanent magnet (IPM) brushless DC (BLDC) motor structure, which utilizes half-type permanent magnet (PM) configuration and has asymmetrical side gaps (slot next to the PMs) for reducing torque ripples. This structure uses 24% less volume of PMs than conventional IPM BLDC motor with a full set of magnets. The characteristics of the proposed motor are compared with three other half-type IPM BLDC motors through finite elements method (FEM) analysis, and the usefulness of the proposed motor was verified through experimental evaluation on prototypes of the conventional motor and proposed motor under various torque load conditions. This research obtained a high-performance IPM BLDC motor while decreasing manufacturing cost at the same time.
High Power Factor Control of High-speed Single-phase BLDC Motor
Lee, Wook-Jin ; Jung, Bumun ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 144~149
DOI : 10.6113/TKPE.2016.21.2.144
This paper presents a power control method of high-speed single-phase BLDC motor. Most electric appliances require a power factor corrector (PFC) to mitigate grid current harmonics. However, the reactive components and power semiconductors in the PFC increase system cost and dimension. In this paper, a new motor drive system for a high-speed single-phase BLDC motor is proposed, which can decrease grid current harmonics without PFC by directly manipulating motor power and eliminating bulky electrolytic dc-link capacitor. Given that the proposed motor power control method does not require motor current controller, no current sensor is necessary. Moreover, the proposed algorithms can be easily implemented using a low-cost micro-controller. The effectiveness of the proposed power control method is verified by experiments.
A Study on the Optimal Design of 5 kW Plasma Discharger
Noh, Hyun-Kyu ; Shin, Chul-Jun ; Lee, Jun-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 150~159
DOI : 10.6113/TKPE.2016.21.2.150
This paper presents a study on the design optimization of a 5 kW plasma discharger for driving plasma reactor. The proposed study is composed of a high-frequency inverter based on the full-bridge circuit using soft switching techniques for high-frequency switching. The switching frequency in the operating region is the area of 130-200 kHz. By applying the LC resonance technique and a variable switching frequency, control technique is designed to be stable under changes in the load characteristics of the plasma reactor. This paper presents a quantitative analysis technique for design optimization. Experiments are performed according to load characteristic variations depending on the vacuum of the plasma reactor. This paper has verified the topology and design method for the 5 kW plasma discharger design.
Development of Battery Simulator for Performance Verification of MW-class PCS
Lee, Jong-Hak ; In, Dong-Seok ; Heo, Nam-Eok ; Park, Young-Min ; Park, Ki-Won ; Kwon, Byung-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 160~167
DOI : 10.6113/TKPE.2016.21.2.160
An energy storage system (ESS) is applied to increase the energy efficiency of large plants or buildings that consume much energy, to improve the power quality of power systems, and to stabilize renewable energy source such as photovoltaic or wind turbine. The ESS is composed of a power conditioning system (PCS) and an energy storage. The battery is used as the energy storage. The battery is needed to design and verify a hardware and control system of PCS. Usually, a battery simulator is used instead of a battery, which is costly and hard to manage. In this paper, the development of the battery simulator for performance verification of the MW-class PCS is described. The battery simulator simulates the charging and discharging characteristics of batteries to design and verify the hardware and control system of PCS.
Analysis of Current Control Stability using PI Control in Synchronous Reference Frame for Grid-Connected Inverter with LCL Filter
Jo, Jongmin ; Lee, Taejin ; Yun, Donghyun ; Cha, Hanju ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 168~174
DOI : 10.6113/TKPE.2016.21.2.168
In this paper, current control using PI controller in the synchronous reference frame is analyzed through the relationship among bandwidth, resonance frequency, and sampling frequency in the grid-connected inverter with LCL filter. Stability is investigated by using bode plot in frequency domain and root locus in discrete domain. The feedback variable is the grid current, which is regulated by the PI controller in the synchronous reference frame. System delay is modeled as 1.5Ts, which contains computational and PWM modulator delay. Two resonance frequencies are given at 815 Hz and 3.16 kHz from LCL filter parameters. Sufficient phase and gain margins can be obtained to guarantee stable current control, in case that resonance frequency is above one-sixth of the sampling frequency. Unstable current control is performed when resonance frequency is below one-sixth of the sampling frequency. Analysis results of stability from frequency response and discrete response is the same regardless of resonance frequency. Finally, stability of current control based on theoretical analysis is clearly verified through simulation and experiment in grid-connected inverters with LCL filter.
Boost Converter Embedded Battery Charging Function for Application of E-bike
Kim, Da-Som ; Kim, Sang-Yeon ; Kang, Kyung-Soo ; Roh, Chung-Wook ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 175~181
DOI : 10.6113/TKPE.2016.21.2.175
In the conventional E-bike, a 42 V/10 A Li-ion battery drives a 24 V/10 A BLDC motor via a 6-switch PWM DC/AC inverter. The major problems of the conventional battery-fed motor drive systems are listed as follows. To charge the battery, an external battery charger (adapter) is required, which degrades the portability of E-bike users. In addition, given the high-frequency operation of the motor drive inverter, the switching losses are significant, which degrades the whole power efficiency. High-voltage batteries (42 V) require a complex battery management system (BMS), which degrades the reliability of the battery pack. In this paper, an embedded boost-converter battery charger for E-bikes is proposed. The variable output boost converter, which converts 16.8 V battery voltage to the required variable voltage of the inverter input, can use a low-voltage battery and thus improve the reliability of batteries. By varying the inverter input voltage via boost converter, a DC link voltage control method can be applied to reduce the switching frequency of the inverter, which improves the whole power efficiency. Given that the function of a flyback charger is integrated in the proposed boost converter, the portability of the E-bike user can be maximized by excluding an external adapter. The validity of the proposed circuit will be confirmed by operation mode analysis and simulation. Moreover, experimental results of integrative charger using Li-ion battery and 200 W motor test will be showed with a prototype sample as well.
Analysis and Modeling of Fishing Boat's Power Network for using Renewable Energy Source
Lee, Sang-Jung ; Lee, Dong-Gil ; Jung, Jee-Hoon ;
The Transactions of the Korean Institute of Power Electronics, volume 21, issue 2, 2016, Pages 182~189
DOI : 10.6113/TKPE.2016.21.2.182
A modeling method of electric power network inside a fishing boat less than 5 tons is proposed for its high-energy efficiency with renewable energy sources. The power network inside the fishing boat consists of a diesel engine, a starter motor, an alternator, battery packs, and electric loads, which are connected in parallel. To obtain proper power network model, the voltage -current characteristics of the electric components are considered to develop elaborate electrical models under several load conditions. Measured data of the battery and alternator current include noise. By using an average method, the AC components from the power network of the fishing boat can be reduced, which is verified by KCL rule. Using the proposed power network model, the power generation of the alternator and the reduction of diesel consumption in the boat's engine are predictable under various operating conditions. The validity of the proposed methodology is verified by comparing simulation results with experimental measurements using statistical inferences.