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확장 칼만 필터를 이용한 PWM 컨버터 센서리스 제어 기법
허승민(Seungmin Hur),강구배(Gubae Kang),남광희(Kwanghee Nam) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In the PWM converter, PLL(Phase Locked Loop) is usually used as a tool which senses the angle of input voltage. This is sensitive to nois and needs additional hardware. In this work, we propose a sensorless control scheme of PWM converter using EKF(Extended Kalman Filter). EKF estimates a phase angle of input voltage from nonlinear state equation using measured phase currents. We control power factor and DC-link voltage utilizing the estimated phase angle. We demonstrate the effectiveness of the proposed estimation algorithm through simulations.
임재상(Jae-Sang Lim),강구배(Gubae Kang),장한근(Han Geun Jang),박주영(Jooyoung Park),임성엽(SeongYeop Lim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
This paper presents an approach for constructing an electro-thermal model of IGBT-devices as inverters considering variable switching frequencies and battery voltage for HEV/EV. IGBT losses depend on current, battery voltage, and switching frequency. Conventional inverter system uses a fixed switching frequency, but variable frequencies operation is needed to reduce switching losses and decrease junction temperature of IGBT. This paper develops the loss function of IGBT thermal model when switching frequencies vary. As a result, a difference between real temperature and estimated temperature of IGBT is reduced and hill holding performance of HEV/EV is improved.
이상규(Sangkyu Lee),한대웅(Daewoong Han),강구배(Gubae Kang),임성엽(Seongyeop Lim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
A charging efficiency of Plug-in Electric Vehicles (PEVs) is related to on-board charger(OBC) efficiency, Low voltage DC-DC converter(LDC) efficiency, amount of vehicle 12V electric component load and AC input voltage. This paper suggests a optimal charging strategy of PEVs by analyzing the quantitative impact of OBC / LDC / Electric component load / AC input power.
구동모터의 순환 전류 제어기를 이용한 친 환경차 등판 성능 개선
유태일(Taeil Yoo),김성민(Sungmin Kim),강구배(Gubae Kang) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
This paper proposes a hill climbing performance improvement logic for traction motor of electric vehicle, through newly developed current circulation logic and a extended equivalent torque line current map. By changing the biggest current flowing switching element to the other switching element, the biggest heat generating switching element can be changed to the other switching element. Based on extended torque line current reference map instead of the usual MTPA current reference map this paper suggest the current circulation logic. With, proposed control scheme the actual output time of constant toque is increased more than 30% of conventional one and we can achieve high driving performance without additional hardware.
임정빈(Jeongbin Yim),전재화(Jaehwa Jeon),한대웅(Daewoong Han),강구배(Gubae Kang),임성엽(Seongyeop Lim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper proposes an optimization of output power stage for DC-DC converter. Firstly, to remove the current sensor of output power stage components, an output current estimation method using output voltage of current transformer is suggested. Secondly, a multi-layer ceramic capacitor is developed and adopted as an output filter instead of a film capacitor. It achieves high performance such as output voltage ripple. With this optimization of the output stage of DC-DC converter, the cost is lower and the size is smaller.
양창훈(Changhoon Yang),박대진(Daejin Park),전용원(yongwon Jeon),강구배(Gubae Kang),한대웅(Daewoong Han) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes design procedure of DC-LINK film capacitor for inverter in HEV. To improve reliability of film capacitor, pattern metalized film used as a dielectric and an electrode is adopted. The proposed film capacitor is designed to have high reliability in optimal size and operation range.