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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 13, Issue 6 - Dec 2008
Volume 13, Issue 5 - Oct 2008
Volume 13, Issue 4 - Aug 2008
Volume 13, Issue 3 - Jun 2008
Volume 13, Issue 2 - Apr 2008
Volume 13, Issue 1 - Feb 2008
Selecting the target year
A Transformer-less Boost Converter with High Gain and Low Current Ripple for Fuel Cell Application
Yang, Jin-Young ; Park, Chan-Ki ; Choi, Se-Wan ; Nam, Seok-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 79~87
Boost Converters have been used to step up and regulate the low and widely varing voltage from the fuel cell. A transformer-less boost converter which does not have lossy, bulky, and costly high frequency transformers has an advantage in applications where galvanic isolation is not required. In this paper a new transformer-less boost converter is proposed. The proposed boost converter has practically usuable 6 to 8 times of step up ratio and is suitable for fuel cell applications due to very low input and output current ripples. The proposed converter is verified through the theorical analysis, simulation and experimental waveform.
Fault Detection of BLDC Motor Drive Based on Operating Characteristic
Lee, Jung-Dae ; Park, Byoung-Gun ; Kim, Tae-Sung ; Ryu, Ji-Su ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 88~95
This paper proposes a fast fault detection algorithm under open-circuit fault of a switch for a brushless DC(BLDC) motor drive system. This proposed method is configured without the additional devices for fault detection and identification. The fault detection and identification are achieved by a simple algorithm using the operating characteristic of the BLDC motor. After the fault identification, the drive system is reconfigured for continuous operation. This system is reconfigured by four-switch topology connecting a faulty leg to the middle point of DC-link bidirectional switches. This proposed method can also be embedded into existing BLDC motor drive systems as a subroutine without excessive computational effort. The feasibility of a the proposed fault detection algorithm is validated in simulation and experiment.
Design and Application of CCFL Drive Inverter Transformer for LCD Backlight
Cho, Sang-Ho ; Han, Sang-Kyoo ; Hong, Sung-Soo ; SaKong, Sug-Chin ; Kwon, Gi-Hyun ; Lee, Hyo-Bum ; Roh, Chung-Wook ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 96~102
In a large screen sized LCD-TV, a backlight system with only one cold cathode fluorescent lamp(CCFL) can not meet brightness specification. Thus, considerable numbers of CCFLs are used to meet brightness specification. In this paper, the design guide for the inverter transformer which can drive 4 CCFLs instantaneously is presented. With the presented design, the inverter transformer that guarantee identical lamp currents under the nonidentical lamp characteristic condition, can be implemented easily. The developed inverter transformer is adopted in a 42" LCD-TV backlight. The experimental results are presented to show the validity of the presented design guide.
Development of a Dimming Ballast for Electrodeless Fluorescent Lamps by Controlling DC-Link Voltage
Jang, Mog-Soon ; Lim, Byoung-Loh ; Shin, Dong-Seok ; Lee, Young-Man ; Park, Chong-Yeun ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 103~109
This paper presents a new method for designing a ballast that can provide dimming control of an electrodeless fluorescent lamp. Frequency control of lamp power is inappropriate because the lamp coefficients such as equivalent impedance, coupling coefficient of the transformer, and plasma resistance are a function of lamp power. In this paper, the dimming is achieved by controlling the DC_Link voltage in relation to the lamp power. The DC_Link voltage is controlled by a buck converter. Simulation and experimental results of the proposed design method are presented in order to validate the proposed method.
A Simplified Series-Parallel Structure for the RPPT (Regulated Peak Power Tracking) system
Yang, Jeong-Hwan ; Bae, Hyun-Su ; Lee, Jea-Ho ; Cho, Bo-Hyung ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 110~118
The regulated peak power tracking (RPPT) systems such as the series structure and the parallel structure are commonly used in the satellite space power system. However, this structure processes the solar array power to the load through two regulators during one orbit cycle, which reduces the energy transfer efficiency. The series-parallel structure for the RPPT system can improve the power conversion efficiency, but an additional regulator increases the cost, size and weight of the system. In this paper, a simplified series-parallel space power system that consists of two regulators is proposed. The proposed system has the similar energy transfer efficiency with the series-parallel structure by adding one switch to the series structure, which reduces the cost, size and the weight. The large signal stability analyses is provided to understand the four main modes of system operation. In order to compare the energy efficiency with a series structure, the simulation is performed. The experimental verifications are performed using a prototype hardware with TMS320F2812 DSP and 200W solar arrays.
Modular Line-connected Photovoltaic PCS
Seo, Hyun-Woo ; Kwon, Jung-Min ; Kim, Eung-Ho ; Kwon, Bong-Hwan ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 119~127
In this paper, the modular line-connected photovoltaic PCS (photovoltaic power conditioning system) is proposed. A step-up DC-DC converter using a active-clamp circuit and a dual series-resonant rectifier is proposed to achieve a high efficiency and a high input-output voltage ratio efficiently. An IncCond (incremental conductance) MPPT (maximum power point tracking) algorithm that improves MPPT characteristic is used. The PV module current is estimated without using a DC current sensor. By control a inverter using a linearized output current controller, a unity power factor is achieved. All algorithms and controllers are implemented on a single-chip microcontroller and the superiority of the proposed DC-DC converter and controllers is proved by experiments.
An Isolated Power System Based on Variable Speed Engine Generator with Super-capacitor
Lee, Joon-Hwan ; Lee, Seung-Hwan ; Sul, Seung-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 128~134
The variable speed engine generator set is interested for an isolated power system due to reduced fuel consumption and less emission. However, because of sluggish dynamic behavior of the internal combustion engine the power quality would be degraded during the sudden load power surge, where the power required by the load is not available by the engine due to the reduced engine speed. An isolated power system based on variable speed engine with a super-capacitor bank can improve dynamic characteristics under such a sudden load change, and power quality, fuel consumption, and pollutants can be improved remarkably. Also, it is verified by the computer simulation that the inverter of 3phase-4leg is compatible to the isolated power system with unbalanced load. In this paper, the feasibility of the system has been verified based on a 26kw commercial diesel engine system.
Design of Charge Pump Circuit for Floating Gate Power Supply of Intelligent Power Module
Lim, Jeong-Gyu ; Chung, Se-Kyo ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 135~144
A bootstrap circuit is widely used for the floating gate power supply of Intelligent power module (IPM). A bootstrap circuit is simple and inexpensive. However, the duty cycle and on-time are limited by the requirement to refresh the charge in the bootstrap capacitor. And the value of the bootstrap capacitor should be increased as the switching frequency decreases. A charge pump circuit can be used to overcome the problems. This paper deals with an analysis and design of a charge pump circuit for the floating gate power supply of an IPM. The simulation and experiment are carried out for an induction motor drive system. The results well verifies the validity of the proposed circuit and design method.
PLL for Unbalanced Three-Phase Utility Voltage using Positive Sequence Voltage Observer
Kim, Hyeong-Su ; Choi, Jong-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 145~151
This paper proposes the PLL method using positive sequence voltage which is estimated by full-order state observer to find an accurate phase angle under the condition of unbalanced utility voltage. The proposed method uses the full-order state observer instead of existing method(APF All Pass Filter) to find a positive sequence of a utility voltage and this proposed method improves transient response of an estimated phase angle when a three-phase utility voltage becomes unbalanced. To compare proposed method withexisting method, experiments have been done for a phase angle detection of utility voltage when a three-phase utility voltage becomes unbalanced. Their results show that transient state response of proposed method is improved.
Sliding-Mode Based Direct Power Control of a Doubly Fed Induction Generator for Wind Turbines
Kim, Won-Sang ; Sim, Gyung-Hun ; Lee, Kyo-Beum ; Jeong, Byoung-Chang ; Song, Seung-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 13, issue 2, 2008, Pages 152~162
This paper presents a sliding mode controller (SMC) to directly control the active and reactive powers of a doubly ffd induction generator (DFIG) for wind turbines. Sliding-mode control (SMC) and space-vector modulation (SVM) are combined to ensure high-performance operation. SMC scheme is designed to provide robust and fast power controls without frame transformation and current controller used in the conventional FOC drive. Simulation results and experimental results demonstrate that proposed methods preserve the effectiveness and robustness during variations of active and reactive power.