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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 18, Issue 6 - Dec 2013
Volume 18, Issue 5 - Oct 2013
Volume 18, Issue 4 - Aug 2013
Volume 18, Issue 3 - Jun 2013
Volume 18, Issue 2 - Apr 2013
Volume 18, Issue 1 - Feb 2013
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Distributed Power Conversion LED Driver Circuit using Parasitic Inductance
Kim, Sang-Eon ; Roh, Chung-Wook ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 117~122
DOI : 10.6113/TKPE.2013.18.2.117
The distributed power conversion LED driver circuit using parasitic inductance is proposed in this paper. while the conventional LED driver circuit is composed of the large size devices and heatsinks, the proposed circuit can be realized with the small sized no heatsink based. since the processing power can be effectively distributed. Also by using the wire parasitic inductance of the LED string, the proposed circuit can be implemented without external magnetic device. As a result, the proposed circuit which features the small size and volume con be realized even without LED driver module(LDM) board. since, all the device can be attached to the existing LED array Module(LAM) board. Therefore, it features that cost savings and volume reduction of circuit. To confirm the validity of the proposed circuit, theoretical analysis and experimental results from a distributed power conversion LED driver circuit prototype are presented.
A Study on the Output Voltage Characteristic of Switched Trans Z-Source Inverter
Kim, Se-Jin ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 123~130
DOI : 10.6113/TKPE.2013.18.2.123
This paper proposes the switched trans Z-source inverter(STZSI) which combined the characteristics of the trans Z-source inverter(TZSI) and the switched inductor Z-source inverter(SLZSI). The proposed STZSI has the same performance compared with the SLZSI which is improved the voltage boost performance of the conventional typical X-shaped ZSI, and it has advantage that circuit structure of Z-impedance network is more simple. And, in order to step up the voltage boost factor under the condition of the same duty ratio, unlike the SLZSI adding the inductors and diodes, the proposed method is dune by changing the turn ratio of trans primary winding of Z-impedance network. To confirm the validity of the proposed method, PSIM simulation and a DSP(TMS320F28335) based experiment were performed using trans with turn ratio 1 and 2 under the condition of the input DC voltage VI=50V, duty ratio D=0.1 and D=0.15. As a result, under the same input/ouput condition, the inverter arm voltage stress of the proposed method is reduced to about 15%-22% as compared with typical X-shaped ZSI, and the elements in Z-impedance network of the proposed method is reduced as compared with the SLZSI.
Phase-Shift Full-Bridge DC/DC Converter with Fixed-Phase Operation Inverter
Kim, Jin-Ho ; Park, Jae-Sung ; Kim, Hong-Kwon ; Park, Jun-Woo ; Shin, Yong-Saeng ; Ji, Sang-Keun ; Cho, Sang-Ho ; Roh, Chung-Wook ; Hong, Sung-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 131~137
DOI : 10.6113/TKPE.2013.18.2.131
In this paper, the phase-shift full-bridge DC/DC converter with fixed-phase operation inverter is proposed. The proposed circuit consists of two full-bridge inverters which are connected in parallel. While one full-bridge inverter operates as the fixed-phase, it regulates the output voltage by adjusting the phase of the other inverter. During the normal operation period, the proposed circuit makes the less amount of conduction loss of the primary switches and secondary synchronous rectifiers, as well as the less amount of the current ripple of the output inductor, than the conventional phase-shift full-bridge DC/DC converter does. Also, it achieves high efficiency by reducing the snubber loss of the secondary synchronous rectifier. To sum up, the present inquiry analyzes the theoretical characteristics of the proposed circuit, and shows the experimental results from a prototype for 450W power supply.
Transient Response Improvement at Startup of Three Phase AC/DC Converter for DC Distribution System in Building Applications
Shin, Soo-Cheol ; Lee, Hee-Jun ; Lee, Jung-Hyo ; Na, Jong-Kuk ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 138~144
DOI : 10.6113/TKPE.2013.18.2.138
Most of the DC loads have had the sensitive characteristics electrically for input voltage. In this system, power converter is operated after connecting with DC loads to minimize the overshoot of the control voltage that may occur during connection of the loads. But whenever starting the power converter, parameters in circuit are different because power converter has been connected with diverse load types at each startup time. This is cause of a disadvantage to PI controller design of power converter. In this paper, the novel voltage control method using sliding mode control theory has proposed. This control method minimizes the overshoot of control voltage at startup of power converter. Despite the variations of the system parameters, the proposed voltage controller has fast response and robustness characteristics such as PI and sliding mode controllers. The proposed controller was applied to the three-phase AC/DC converter and each performance of controller was verified.
Fault Diagnosis of DC Link Electrolytic Capacitors in Inverter
Yang, Jin-Kyu ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 145~152
DOI : 10.6113/TKPE.2013.18.2.145
Electrolytic capacitors used for smoothing DC link voltage is one of the major root causes of fault in power electronic system. The aging of aluminum electrolytic capacitors is expressed by the increase of their equivalent series resistance (ESR) and the reduction of their capacitance. Thus, the proposed technique in this paper is to measure capacitance, by comparing energy loss of DC link capacitors with stator resistor in electric machine. Condition of DC link capacitors can be estimated from the capacitance decrease rate between initial and aged capacitors. The results show that the proposed technique provides an easy, widely applicable and simple low cost solution for detecting dc link capacitor degradation.
Variable Output and Parallel Operation Control of EV Charger
Lee, Sang-Hyeok ; Kang, Seong-Gu ; Awasthi, Prakash ; Hwang, Jung-Goo ; Lee, Seung-Yul ; Wi, Han-Byul ; Park, Sung-Jun ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 153~160
DOI : 10.6113/TKPE.2013.18.2.153
This research paper describes the development of battery charger with a variable output voltage capacity for charging the batteries used in electrical vehicles. The voltage and current accordingly is control via the buck converter that receives three phase current at primary side and fed to bridge rectifier which is comprised of full bridge converter and HFTR(High Frequency Transformer) for isolation and a square wave AC output. The transformer primary side is in series to divide certain charging current and the secondary side is comprised of six fix transformers so that they can generate certain amount of power and various output voltage through relay connection using 6 DC outputs. Moreover, all parallel connected full bridge serial resonant converter communicate together with upper(main) controller. The constructed structure is verified by conducting the test on PSIM as well as experimentally.
A Compensation of the Grid Current Unbalance and Distortion caused by the Grid Voltage Unbalance and Distortion in 3-Phase Bi-Directional DC to AC Inverter
Yang, Seung-Dae ; Kim, Seung-Min ; Choi, Ju-Yeop ; Choy, Ick ; Song, Seung-Ho ; Lee, Sang-Cheol ; Lee, Dong-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 161~168
DOI : 10.6113/TKPE.2013.18.2.161
This paper presents an algorithm of a compensation of the grid current distortion caused by the grid voltage unbalance and distortion in 3-phase bi-directional DC to AC inverter. Usually 3-phase grid system has unbalance and distortion because of connecting 1-phase and non-linear load with 3-phase load using same input node. Controlling 3-phase inverter by general method under the unbalanced and distorted grid voltage, the grid current has distortion. This distortion of the grid current cause the grid voltage distortion again. So, it need to control the grid current balanced and non-distorted, even the grid voltage gets unbalanced and distorted. There are some complex method to compensate the gird current distortion. it suggest simple method to solve the problem. Simulation and experiment is used to validate the proposed algorithm.
Operation and Performance Analysis of New Bidirectional Intelligent Semiconductor Transformer
Kim, Do-Hyun ; Lee, Byung-Kwon ; Han, Byung-Moon ; Lee, Jun-Young ; Choi, Nam-Sup ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 169~177
DOI : 10.6113/TKPE.2013.18.2.169
This paper proposes a new configuration of bidirectional intelligent semiconductor transformer with rating of 1.9kV/127V, 2kVA. The proposed transformer consists of high-voltage high-frequency AC-DC rectifier, and low-voltage DC-DC and DC-AC converters. The operational feasibility of proposed transformer was verified by computer simulation with PSCAD/EMTDC software. Based on the simulation results, a hardware prototype with rating of 1.9kV/127V, 2kVA was built and tested in the lab to confirm the feasibility of hardware implementation. Using three units of this transformer, a 3-phase transformer with rating of 3.3kV/220V, 6kVA can be built.
Analysis of Surge Current Path of Flyback Converter by Lightning Surge
Park, Jun-Woo ; Lee, Kang-Hee ; Kim, Jin-Ho ; Hong, Sung-Soo ; Won, Jae-Sun ; Kim, Jong-Hae ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 178~183
DOI : 10.6113/TKPE.2013.18.2.178
The study of lightning surge have been conducted on information and communications equipment and power system. However, the research on SMPS itself is an inactive field. This paper analyzes surge current path of flyback converter with the combination wave generator by lightning surge. Also, this paper discloses that there exists the surge current with high-frequency component besides the low-frequency component based on the standard surge current. This high-frequency surge current is the major reason to damage the semiconductor devices such as FET and IC. To confirm the validity of the proposed issue, the analysis and experimental results are presented.
Design and Analysis of Resonant Bidirectional AC-DC Converter using Dual Half-Bridge Converter
Byen, Byeng-Joo ; Choi, Jung-Muk ; Han, Dong-Hwa ; Lee, Young-Jin ; Seo, Hyun-Uk ; Choe, Gyu-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 184~191
DOI : 10.6113/TKPE.2013.18.2.184
In this paper, bidirectional AC-DC converter using dual half-bridge converter is proposed. A transformer leakage inductance in the dual half-bridge converter is used for making resonance with the capacitor of the voltage-doubler, which can help the switched current to be sinusoidal without extra inductive component and also the switching loss can be reduced through operation such as ZVS, ZCS. Both circuit analysis and design guideline are described, and also the feasibility for the proposed converter is shown through the hardware implementation and the experimental results.
Energy Conversion System using a Novel Multi-Mode DC/DC Converter for Hybrid Electric Vehicles
Park, Tae-Sik ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 192~198
DOI : 10.6113/TKPE.2013.18.2.192
The rapidly growing demand for electric power systems in electric vehicles (EVs) and hybrid electric vehicles (HEVs) require simpler, cost-effective, and higher performance components. In this paper, a novel power conversion system for hybrid electric vehicles is proposed for these needs. The proposed power conversion system reduces the conversion system cost while preserving same functionality. The proposed power conversion system can boost multi-sources to drive a traction motor and to store energy at the same time reducing number of switching components. In this paper, all operational modes of the proposed converter are explained in detail and verified by a computer simulation first. Then, the topology and operational modes are experimentally verified. Based on the results, the feasibility of the proposed multi-mode single leg power conversion system for EV and HEV applications is discussed.
Switch Open Circuit Fault Detection for Power Conversion System of Hybrid Electric Vehicles
Park, Tae-Sik ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 2, 2013, Pages 199~204
DOI : 10.6113/TKPE.2013.18.2.199
Recently, the demand for fuel efficient electric vehicles (EVs) and hybrid electric vehicles (HEVs) has been growing globally. Due to the increased number of switching devices in the electrified vehicles, the probability of the semiconductor device failure is much higher than in other application areas. A sudden failure in one of the power switches and insufficient power management ability in the systems not only decreases system performance, but also leads to critical safety problems. In this paper, novel switch open circuit fault detection method is proposed, and the proposed approach is verified by experiments.