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Younghoon Cho,Hidekazu Miwa,Jih-Sheng Lai 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper proposes a digital single-loop control method which enables a seamless mode transition between voltage and current control mode and current slew-rate control for a battery connected multi-phase dc-dc converter. The proposed algorithm consists of a current reference generator and a digital average current controller. The current reference generator changes the time constant of the digital integrator to implement ramp-up and ramp?down of the current reference command. The digital average current controller is designed to track the current reference accurately. A small signal model of the current control loop is derived and the control parameters are determined by the small signal analysis. A startup method when the output of the dc-dc converter is connected to a battery is also proposed to prevent reverse current flowing back to the converter input which is connected to the fuel-cell stack in the design. A prototype 5 ㎾ four-phase dc-dc converter serving as an auxiliary power supply in heavy duty trucks has been built and tested to verify the effectiveness of the proposed method.
A Series Arc Fault Detection Strategy for Single-Phase Boost PFC Rectifiers
Younghoon Cho,Jongung Lim,Hyunuk Seo,Sun-Bae Bang,Gyu-Ha Choe 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6
This paper proposes a series arc fault detection algorithm which incorporates peak voltage and harmonic current detectors for single-phase boost power factor correction (PFC) rectifiers. The series arc fault model is also proposed to analyze the phenomenon of the arc fault and detection algorithm. For arc detection, the virtual dq transformation is utilized to detect the peak input voltage. In addition, multiple combinations of low- and high-pass filters are applied to extract the specific harmonic components which show the characteristics of the series arc fault conditions. The proposed model and the arc detection method are experimentally verified through a boost PFC rectifier prototype operating under the grid-tied condition with an artificial arc generator manufactured under the guidelines for the Underwriters Laboratories (UL) 1699 standard.
Analysis of the Admittance Component for Digitally Controlled Single-Phase Bridgeless PFC Converter
Younghoon Cho,Hyungsoo Mok,Jih-Sheng Lai 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
This paper analyzes the effect of the admittance component for the digitally controlled single-phase bridgeless power factor correction (PFC) converter. To do this, it is shown how the digital delay effects such as the digital pulse-width modulation (DPWM) and the computation delays restrict the bandwidth of the converter. After that, the admittance effect of the entire digital control system is analyzed when the bridgeless PFC converter which has the limited bandwidth is connected to the grid. From this, the waveform distortion of the input current is explained and the compensation method for the admittance component is suggested to improve the quality of the input current. Both the simulations and the experiments are performed to verify the analyses taken in this paper for the 1 kW bridgeless PFC converter prototype.
Phase Current Reconstruction Techniques for Two-Phase Inverters using a Single Current Sensor
Younghoon Cho,Kwan-Yuhl Cho,Hyungsoo Mok,Kyeong-Hwa Kim,Jih-Sheng Lai 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.6
This paper proposes phase current reconstruction techniques for two-phase two-leg and two-phase four-leg inverters using a single current sensor. In the proposed methods, one phase current is sampled simultaneously with a particular branch current by using only one current sensor, and then current reconstruction algorithms are applied to extract the information on two phase currents from the sensor output. The sampled current information is periodically updated at the peak and the valley of the triangular carrier waveform in each switching cycle of pulse-width modulation (PWM). The voltage vector spaces where the phase currents can be reconstructed are evaluated. Compared to the existing method using two individual current sensors in two phases, the proposed schemes can save implementation cost since it is possible to remove one current sensor. In addition, the proposed methods are free from gain discrepancy issues between two current sensors. Simulations and experiments show excellent current reconstruction performance of the proposed methods.
A Series Arc Fault Detection Strategy for Single-Phase Boost PFC Rectifiers
Cho, Younghoon,Lim, Jongung,Seo, Hyunuk,Bang, Sun-Bae,Choe, Gyu-Ha The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6
This paper proposes a series arc fault detection algorithm which incorporates peak voltage and harmonic current detectors for single-phase boost power factor correction (PFC) rectifiers. The series arc fault model is also proposed to analyze the phenomenon of the arc fault and detection algorithm. For arc detection, the virtual dq transformation is utilized to detect the peak input voltage. In addition, multiple combinations of low- and high-pass filters are applied to extract the specific harmonic components which show the characteristics of the series arc fault conditions. The proposed model and the arc detection method are experimentally verified through a boost PFC rectifier prototype operating under the grid-tied condition with an artificial arc generator manufactured under the guidelines for the Underwriters Laboratories (UL) 1699 standard.
Digital Control Strategy for Single-phase Voltage-Doubler Boost Rectifiers
Younghoon Cho,Hyungsoo Mok,Jun-Keun Ji,Jih-Sheng Lai 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.4
In this paper, a digital controller design procedure is presented for single-phase voltage-doubler boost rectifiers (VDBR). The model derivation of the single-phase VDBR is performed in the s-domain. After that the simplified equivalent z-domain models are derived. These z-domain models are utilized to design the input current and the output dc-link voltage controllers. For the controller design in the z-domain, the traditional K-factor method is modified by considering the nature of the digital controller. The frequency pre-warping and anti-windup techniques are adapted for the controller design. By using the proposed method, the phase margin and the control bandwidth are accurately achieved as required by controller designers in a practical frequency range. The proposed method is applied to a 2.5 kVA single-phase VDBR for Uninterruptible Power Supply (UPS) applications. From the simulation and the experimental results, the effectiveness of the proposed design method has been verified.
Analysis of the Admittance Component for Digitally Controlled Single-Phase Bridgeless PFC Converter
Cho, Younghoon,Mok, Hyungsoo,Lai, Jih-Sheng The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
This paper analyzes the effect of the admittance component for the digitally controlled single-phase bridgeless power factor correction (PFC) converter. To do this, it is shown how the digital delay effects such as the digital pulse-width modulation (DPWM) and the computation delays restrict the bandwidth of the converter. After that, the admittance effect of the entire digital control system is analyzed when the bridgeless PFC converter which has the limited bandwidth is connected to the grid. From this, the waveform distortion of the input current is explained and the compensation method for the admittance component is suggested to improve the quality of the input current. Both the simulations and the experiments are performed to verify the analyses taken in this paper for the 1 kW bridgeless PFC converter prototype.
조영훈(Younghoon Cho),제성규(Sungkyu Je),윤석찬(Seokchan Yun) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
본 논문은 자동차용 능동 전륜 조향 제어 시스템을 소개한다. 능동 전륜 조향 장치는 조향의 편의성과 안정성을 위하여 조향비를 가변하거나 유사시 능동적으로 전자 제어 유닛(Electronic Control Unit : ECU)이 액추에이터를 제어해 주는 시스템이다. 최근 전자 샤시 시스템의 개발 추세인 샤시 통합제어 관점에서 능동 전륜 조향 장치의 역할을 설정하고 성능만족을 위한 제어기 구조에 관하여 설명한다. 설계된 제어 시스템을 3,300㏄급 대형 승용차에 적용하여 그 유용성을 검증하였다.
표면부착형 영구 자석 전동기를 이용한 전동기 구동 파워 스티어링 제어 시스템의 개발
조영훈(Younghoon Cho),정연우(Yeonwoo Jeong),윤석찬(Seokchan Yun) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper describes a development of MDPS control system using Surface mounted Permanent Magnet Synchronous Motor (SPMSM). The control system is composed of MDPS logic to improve vehicle dynamics characteristics and motor torque controller to track torque reference precisely. A DC link current sensing and reconstruction algorithm is also included to attain cost down in the control system. The validity of the developed control system is verified by experiments in laboratory and a 2,200㏄ level Sports Utility Vehicle (SUV) under various driving conditions.