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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
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 12, Issue 6 - Dec 2007
Volume 12, Issue 5 - Oct 2007
Volume 12, Issue 4 - Aug 2007
Volume 12, Issue 3 - Jun 2007
Volume 12, Issue 2 - Apr 2007
Volume 12, Issue 1 - Feb 2007
Selecting the target year
A Study on the Reduction of Standby Power Consumption for Multiple Output Converters
Jung, Jee-Hoon ; Choi, Jong-Moon ; Kwon, Joong-Gi ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 433~440
Recently, the reduction of standby power consumption is significantly issued in electronic and electrical industry for the conservation of environment. In the case of a switched mode power supply (SMPS), it is demanded high efficiency at extremely low output power conditions by consumers. However, it is very different from high efficiency techniques at full load conditions. In addition, many SMPSs are designed as a multi-output circuit for various loads because of cost down. This circuit is difficult to implement both high efficiency and good cross regulation performance, simultaneously. In this paper, secondary side post regulator (SSPR), current mode control method, and power sequence control technique are proposed to reduce standby power consumption and to improve cross regulation performance of the multi-output SMPSs which consist of single or multiple converter. The proposed methods are analyzed by their operational principles and optimal designs verified by experimental results with 110[W] and 270[W] SMPSs.
High efficiency & Low cost PCM Backlight Inverter for large Area LCD TV
Jang, Young-Su ; Roh, Chung-Wook ; Hong, Sung-Soo ; SaKong, Sug-Chin ; Kim, Jong-Duck ; Lee, Hyo-Bum ; Han, Sang-Kyoo ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 441~448
To enhance the competitive edge of the material cost, IP(Integrated Power) Board form of inverter circuit is widely used in large area LCD TV(Greater than or equal to 40 in.). This scheme is Two Stage System and one inverter drives multi-lamp in a parallel circuit. This paper analyzes the conventional IP Board inverter controlled with Pulse Width Modulation (PWM), and its problems such as serious hard switching and excessive circulating energy can be solved by a proposed Pulse Count Modulation (PCM) scheme. To confirm the validity and superiority of the proposed system, theoretical analysis and experimental results are presented.
Analysis and a Compensation Method for Torque Ripple caused by Position Sensor Error in PMSM's Vector Control
Mok, Hyung-Soo ; Lee, Jeong-Min ; Choe, Gyu-Ha ; Kim, Sang-Hoon ; Cho, Young-Hoon ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 449~455
Position information is very important when driving the Permanent Magnet Synchronous Motor(PMSM). Generally, resolver is used to obtain exact position information. However, it generates periodic position errors due to the transformer ratio difference and excitation signal distortion. When the vector control is done with the position information that includes position error, torque ripple is generated from time to time. This paper proposes the solution through analysis of above problem. Also, it's validity is verified by simulation and experiment.
A Three-phase Current-fed DC-DC Converter with Active Clamp
Cha, Han-Ju ; Choi, Jung-Wan ; Yoon, Gi-Gab ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 456~464
This paper proposes a novel three-phase current-fed active clamp DC-DC converter for fuel cells. A single common active clamp branch is used to limit transient voltage across the three-phase full bridge and to realize zero-voltage switching(ZVS) in all switches. To apply for the power generation system current-fed type has been combined with the three-phase power conversion system. The proposed approach has the following advantages: an increase (by a factor of three) of input current and output voltage chopping frequencies; lower RMS current through the inverter switches with higher power transfer capability; reduction in size of reactive later components and the power conditioning system; better transformer utilization; increase of the system reliability. Therefore, the proposed three-phase current-fed active clamp DC-DC converter is appropriate for the boost type DC-DC converter for fuel cells and also applicable for the photovoltaic and battery charge system. The paper details the analysis, simulation and hardware implementation of the proposed system. Finally, experimental results with the proposed PWM strategy demonstrate the feasibility of the proposed scheme on a 500W prototype converter.
A Study on PFC Buck-Boost AC-DC Converter of Soft Switching
Kwak, Dong-Kurl ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 465~471
The system efficiency of the proposed Buck-Boost AC-DC converter is increased by soft switching method. The converter includes to merit of power factor correction (PFC) from sinusoidal control of input current. The switching behavior of control switches operates with soft switching by partial resonance, and then the proposed converter has high system efficiency with decrement of switching power loss. The input current waveform in proposed converter is got to be a sinusoidal form of discontinuous quasi-pulse row in proportion to magnitude of AC input voltage under the constant duty cycle switching. Therefore, the input power factor is nearly unity. The output voltage of the converter is regulated by PWM control technique. The discontinuous mode action of current flowing into inductor makes to simplify control method and control components. The proposed PFC Buck-Boost converter is analyzed to compare with the conventional PFC Buck-Boost converter. Some computer simulative results and experimental results confirm to the validity of the analytical results.
Operating Characteristics of LLC Series Resonant Converter
Kang, Sung-In ; Yoon, Kwang-Ho ; Park, Jun-Ho ; Huh, Dong-Young ; Kim, Eun-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 472~482
The LLC series resonant converter with a LLT (Inductor-Inductor-Transformer) transformer design process and experimentation results for PDP TV power supply is presented. LLT transformer used to combine the inductor and transformer into one unit has the increased leakage inductance in the primary and secondary due to the winding method and the use of the gaped core. The increased leakage inductance in the primary and secondary of LLT transformer can be impacted on the DC voltage gain characteristics of LLC series resonant converter, In this paper, DC gain characteristics and the experimental results of the LLC series resonant converter with a LLT transformer are verified on the Math-CAD simulation based on the theoretical analysis and the 600W experimental prototype.
A study of Train Running Simulation for Electronic Performance Analysis of Propulsion
Kim, Young-Chan ; Seo, Young-Ger ; Lee, Byung-Song ; Hong, Soon-Chan ; Ko, Jung-Sun ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 483~490
The aim of the paper is to analysis on train propulsion system and to study for energy saving. For this study, we make the program that simulate actual operation of the train route. The train running simulation is performed from starting station to 4th station by using the route datas of Deajeon Metro Subway. The study for control method of electrical motor and energy recovery to save energy is selected. The train propulsion system is constituted as a M-G Set, which is realized via Space Vector Modulation(SVM) - Direct Torque Control(DTC), the energy consumption during train operation and energy recovery during breaking is simulated by Simplorer program, from this result, the energy consumption and recovery of train with SVM-DTC is studied.
Load Modeling of the Drum Washing Machine Considering the Mechanical Characteristics
Lee, Jung-Hyo ; Lee, Won-Chul ; Yu, Jae-Sung ; Jung, Yong-Chae ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 491~499
The variation of a load characteristic in the motor drive is one of the most important consideration. Because the current flowing into the motor generally varies according to the load variation, it needs to design the motor drive circuit properly in accordance with the load variation. However, the load variation of the drum washing machine is irregular and large due to the water flow and reverse load torque. Therefore, to design the motor drive circuit considering this load pattern, simulation results shows the load pattern modeling of the drum washing machine based on the physical analysis in this paper.
Development of PC based Digital Controller of Ultrasonic Motor Using FPGA
Kim, Dong-Ok ; Lee, Hwa-Chun ; Song, Sung-Geun ; Kim, Young-Dong ; Lim, Young-Cheol ; Park, Sung-Jun ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 500~509
In this paper, we propose a novel pc-based 8-channel USB interface digital multi-controller (DMC) has capacity to be able to adjust ultrasonic motor's (USM's) the parameters-frequency, amplitude, phase difference using FPGA. The proposed DMC can control parameters directly by digital logic through a FPGA. Since it has counter circuit for rotary encoder to measure position and velocity of USM, the other separate circuits are unnecessary. Therefore, it could reduce the size of controller and the production cost. Finally, to verify the performance of proposed DMC, we tested the speed characteristic of two types USM with no-load as adjusting the parameters.
Off-time Control Method for High Power Density AC/DC Adapter
Kang, Shin-Ho ; Jang, Jun-Ho ; Hong, Sung-Soo ; Lee, Jun-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 6, 2007, Pages 510~516
The proposed method offers an improved control method for high power density AC/DC adapter by using more energy efficient electrical equipments. Power factor correction (PFC) topology is based on boost topology with boundary conduction mode (BCM). DC/DC topology is based on half-bridge topology with fixed 50% duty and newly introduced off-time control method, which helps to reduce size of the semiconductor and the magnetic devices. Test results with 85W AC/DC adapter (18.5V/4.6A) design show that the measured efficiency is 90% with power density of
. It also shows low no load power consumption of about 0.5W.