Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Transactions of the Korean Institute of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 17, Issue 6 - Dec 2012
Volume 17, Issue 5 - Oct 2012
Volume 17, Issue 4 - Aug 2012
Volume 17, Issue 3 - Jun 2012
Volume 17, Issue 2 - Apr 2012
Volume 17, Issue 1 - Feb 2012
Selecting the target year
Analysis of Cross-Regulation Characteristics for Multi-Output LLC Resonant Converter
Jeong, Jin-Woo ; Lim, Jeong-Gyu ; Kim, Jong-Hae ; Oh, Dong-Seong ; Chung, Se-Kyo ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 281~290
DOI : 10.6113/TKPE.2012.17.4.281
This paper describes a Cross-regulation characteristics of a multi-output LLC resonant converter widely used in consumer electronics. The output characteristics of the multi-output LLC converter is derived from the assumption that the current and voltage in the resonant network is sinusoidal and the duty loss exists. The simulation and experimental results are provided to verify the theoretic results.
A New Multilevel Inverter of H-bridge Topology using Bidirection Switch
Lee, Sang-Hyeok ; Kang, Seong-Gu ; Lee, Tae-Won ; Hur, Min-Ho ; Park, Sung-Jun ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 291~297
DOI : 10.6113/TKPE.2012.17.4.291
Recently, Switching devices become cheaper, depending on the multi-level inverters are considered as the power-conversion systems for high-power and power-quality demanding applications. The multi-level inverters can reduce the THD(Total Harmonic Distortion) as the output which is similar sinusoidal waveform by synthesizing several capacitor DC voltages. However it has some disadvantages such as increased number of components, complex PWM control method. Therefore, this paper is proposed the new multi-level inverter topology using an new H-bridge output stage with a bidirectional auxiliary switch. The proposed topology is the 4-level 3-phase PWM inverter with less switching part than conventional multi-level inverters and reactive power control possible. In order to understand the new multi-level inverter, topology analysis and switching patterns and modes according to the current loop are described in this paper. The proposed multi-level inverter topology is validated through PSIM simulation and the experimental results are provided from a prototype.
A ZV-ZCT Boost Converter using an Auxiliary Resonant Circuit
Jung, Doo-Yong ; Kim, Jun-Gu ; Ryu, Dong-Kyun ; Song, In-Beom ; Jung, Yong-Chae ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 298~305
DOI : 10.6113/TKPE.2012.17.4.298
This paper proposes a soft switching boost converter with an auxiliary resonant circuit. The auxiliary resonant circuit is added to a general boost converter and that is composed of one switch, one diode, one inductor and two capacitors. The resonant network helps the main switch to operate with a zero voltage switching(ZVS) and auxiliary switch also operates under the zero voltage and zero current conditions. The soft switching range is extended by the auxiliary switch and it is possible to control the proposed converter with a pulse width modulation(PWM). The ZVS and ZCS techniques make switching losses decreased and efficiency of the system improved. A theoretical analysis is verified through the simulation and experiment.
A Single-Phase Embedded Z-Source DC-AC Inverter by Asymmetric Voltage Control
Oh, Seung-Yeol ; Kim, Se-Jin ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 306~314
DOI : 10.6113/TKPE.2012.17.4.306
In case of the conventional DC-AC inverter using two DC-DC converters with unipolar output capacitor voltages, for generating the AC output voltage, the output capacitor voltages of its each DC-DC converter must be higher than the DC input voltage. To solve this problem, this paper proposes a single-phase DC-AC inverter using two embedded Z-source converters with bipolar output capacitor voltages. The proposed inverter is composed of two embedded Z-source converters with common DC source and output AC load. The AC output voltage is obtained by the difference of the output capacitor voltages of each converter. Though the output capacitor voltage of converter is relatively low compared to the conventional method, it can be obtained the same AC output voltage. Moreover, by controlling asymmetrically the output capacitor voltage, the AC output voltage of the proposed system is higher than the DC input voltage. To verify the validity of the proposed system, a DSP(TMS320F28335) based single-phase embedded Z-source DC-AC inverter was made and the PSIM simulation was performed under the condition of the DC source 38V. As controlled symmetrically and asymmetrically the output capacitor voltages of each converter, the proposed inverter could produce the AC output voltage with sinusoidal waveform. Particularly, in case of asymmetric control, a higher AC output voltage was obtained. Finally, the efficiency of the proposed system was measured as 95% and 97% respectively in case of symmetric and asymmetric control.
Anti-islanding Method by Harmonic Injection for Utility Interactive Inverter with Critical Load
Oh, Hyeong-Min ; Choi, Se-Wan ; Kim, Tae-Hee ; Lee, Gi-Pung ; Lee, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 315~321
DOI : 10.6113/TKPE.2012.17.4.315
The utility-interactive inverter with critical loads should supply continuous and stable voltage to critical loads even during the grid fault. The conventional control method which performs current control for grid-connected mode and voltage control for stand-alone mode undergoes the critical load voltage variation during grid fault. The critical load voltage may have large transient when the inverter performs mode transfer after the islanding detection. Recently, the indirect current control method which does not have the transient state during not only islanding detection but also the mode transfer has been proposed. However, since the voltage control is maintained even during the grid-connected mode it is difficult to detect the islanding. This paper proposes an active anti-islanding method suitable for the indirect current control method which does not have NDZ(Non-Detection Zone).
High Gain Soft switching Bi-directional Converter for Eco-friendly Vehicle HDC
Oh, Se-Cheol ; Park, Jun-Sung ; Kwon, Min-Ho ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 322~329
DOI : 10.6113/TKPE.2012.17.4.322
This paper proposes a non-isolated bidirectional soft-switching converter with high voltage for high step-up/down and high power applications. Compared to the conventional boost converter the proposed converter can achieve approximately doubled voltage gain using the same duty cycle. The voltage ratings of the switch and diode are reduced to half, which result in the use of devices with lower
and on drop leading to reduced conduction losses. Also, voltage ratings of the passive components are reduced, and therefore the total energy volume is reduced to half. Further, the switch is turned on with ZVS in the CCM operation which results in negligible surge caused leading to reduced switching losses. The validity of the proposed converter is proved through a 10kW prototype.
Novel Zero-Voltage-Transition Synchronous Buck Converter for Portable System
Kim, Nak-Yoon ; Choi, Hyun-Chil ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 330~336
DOI : 10.6113/TKPE.2012.17.4.330
In this paper, novel zero-voltage-transition(ZVT) synchronous buck converter of pulse-width-modulation(PWM) method is proposed to utilize auxiliary circuit. In this proposed scheme, designed to operate low output voltage for portable system and applied synchronous scheme to improve efficiency. Also proposed circuit is designed to do soft-switching operation in every switch. In this paper, the circuit operation is explained and analysed, and design guidelines are presented. To verify the availability of the proposed circuit, experiment and simulation is carried out.
Design and Simulation of High Efficiency PWM Modulation Method for Three-phase Matrix Converter
Lim, Hyun-Joo ; Cha, Han-Ju ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 337~344
DOI : 10.6113/TKPE.2012.17.4.337
A matrix converter is used for converting AC/AC power directly. In order to generate sinusoidal input/output waveform in matrix converter, it uses nine bidirectional switches and PWM modulation. This paper presents an analytical averaged loss model of matrix converter with DDPWM(direct duty ratio PWM) and proposes a new switching method for reducing switching losses. A Mathematical loss models with average magnitude of voltage/current are classed as conduction and switching loss. The proposed switching pattern is improved with existing DDPWM. To prove improved efficiency with proposed DDPWM, this paper compares losses between suggested switching pattern and conventional switching pattern using mathematical and simulation method. Each loss types are influenced by environmental factors such as temperature, switching frequency, output current and modulation method.
A Study on 120Hz Output Voltage Ripple Reduction of LLC Converter using Resonant Controller
So, Byong-Chul ; Lee, Sang-Ri ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ; Hwang, Soon-Sang ; Choi, Eun-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 345~352
DOI : 10.6113/TKPE.2012.17.4.345
This paper proposes a new method to reduce 120Hz output voltage ripple of LLC converter using resonant voltage controller. This method can reduce the 120Hz output voltage ripple with very high gain at this frequency by the resonant controller with previous PI voltage controller. The reason why the voltage ripple can be reduced is explained by the Bode diagram comparing with the previous PI controller. The simulation with Matlab/Simulink is carried out for this resonant controller and the simulation results show that resonant controller can reduce the 120Hz output voltage ripple. Experiments with DSP controller also carried out and the experimental results also show that the usefulness of the proposed voltage controller.
Three-phase Power Equalizing System with UPS Function based on Battery Storage
Kwon, Jung-Min ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 353~358
DOI : 10.6113/TKPE.2012.17.4.353
In this paper, three-phase power equalizing system (PES) with UPS function is proposed. This system is based on NiMH battery with battery management system. The power conversion circuit is composed with the three-phase converter/inverter, the bi-directional converter, and the thyristor switches. The three-phase converter/inverter provides the power to the grid or get the power from the grid. Also, it operates as a UPS. The bi-directional converter charges or discharges the battery. The thyristor switches are used for connecting/disconnecting with the grid and the load. A 15 kW prototype is implemented for the verifying the performance of the proposed system.
PSiM Based Dynamic Analysis of Input Split Type Hybrid Electric Vehicle
Bae, Tae-Suk ; Choi, Jae-Ho ; Lim, Deok-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 359~367
DOI : 10.6113/TKPE.2012.17.4.359
In this paper, the input split type series-parallel hybrid electric vehicle (SPHEV) is established and the interpretation of the dynamic characteristics in four kinds of HEV modes, such as electric vehicle mode, engine mode, hybrid mode, and regeneration mode, is described. For this research, the forward-facing approach simulation method is chosen, which is useful for vehicle dynamic analysis. The rating of each powertrain component is designed based on energy-based concept and electrical peaking hybrid (ELPH) method. Finally, the designed powertrain is evaluated with the developed PSiM simulator and simulation results are shown.
A Novel DC Solid-State Circuit Breaker for DC Grid
Kim, Jin-Young ; Kim, In-Dong ; Nho, Eui-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 4, 2012, Pages 368~376
DOI : 10.6113/TKPE.2012.17.4.368
According to developed distributed generators, Solid State Circuit Breaker(SSCB) is essential for high power quality of DC Grid. In this paper, a simple and new structure of DC SSCB with a fast circuit breaker and fault current limiter is proposed. It can help to choice low specification of elements because of the limiting of fault current and achieve economic efficiency for minimizing auxiliary SCRs. Also all of SCRs have little switching loss because they operate under ZVS and ZCS. Through simulations and experiments of short-circuit fault, the performance characteristic of proposed circuit is verified and a guideline is so suggested that the DC SSCB is applied for a different DC grid using formulas.