• 대한전기학회논문지:시스템및제어부문D
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• 제49권4호
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• pp.175-182
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• 2000

The back-light inverter used in the laptop computer is designed in this paper. It has been difficult for electromagnetic transformer to enhance the efficiency and compact profile of the inverter. In this paper, (1) the piezoelectric transformer (PT) is used for reducing the loss; (2) the volumes of core and winding coil are used in electromagnetic transformer, and (3) the half-bridge series parallel resonant circuit is used in the driver of the inverter. The modified PT for this paper and the equivalent circuit are supported by the simulation program. The result of the experiment shows more than 91% improvement in terms of the efficiency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.711-713
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• 2000

Recently, the insulation breakdown accident happened at 6.6kV inverter driving motor brings out the reliability decrease to the motor driving system. We need to find the solution with system engineering level. The objectives of this study are developing the appropriate filter for the drive to protect the motor and the insulation system of motor which is driven by inverter. The circuit parameters of cable are calculated by EMTP(Electromagnetic Transient Program) to simulate the system. And we use MATLAB to find the appropriate filter parameter. The simulation and the test results are compared to verify the suitability of the filter parameter. We clarify the cause of the deterioration of the inverter driving motor through the analysis of insulation breakdown accidents. The endurance test scheme and the configuration method of insulation system are established.

• 설비공학논문집
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• 제13권11호
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• pp.1079-1088
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• 2001

A dynamic simulation model was developed to analyse the transient characteristics of a multi-inverter heat pump. The programs included a basic air conditioning system such as a evaporator, condenser, compressor, linear electronic expansion valve (LEV) and by-pass circuit. The theoretical model was derived from mass conservation and energy conservation equations to predict the performance of the multi-inverter heat pump at various operating conditions. Calculated results were compared with the values obtained from the experiments at different operation frequencies of compressor, area of the LEV and configuration of indoor units operation. The results of the simulation model showed a good agreement with the experimental ones, so that the model could be used as an efficient tool for thermodynamic design and control factor design of air-conditioners.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1151-1153
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• 2003

In this paper, switching surge voltage distribution in stator windings of induction motor driven by IGBT PWM inverter is studied. To analyze the irregular voltage of stator winding, equivalent circuit model of inverter-cable-motor was proposed and high frequency parameter is computed by using finite element method (FEM). Electromagnetic transient program (EMTP) analysis of the whole system for induction motor and PWM inverter is proposed. In order to experiment, an induction motor, 380 [V], 50 [HP], with taps from one phase and a switching surge generator was built to consider the voltage distribution.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 추계학술대회 논문집
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• pp.17-20
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• 2002

In this paper voltage distribution in stator windings of induction motor driven by IGBT PWM inverter is studied. To analyze the irregular voltage of stator winding, equivalent circuit model of inverter-cable-motor was proposed and high frequency parameter is computed by using finite element method (FEM). Electro-magnetic transient program (EMTP) analysis of the whole system for induction motor and PWM inverter is proposed. Induction motor, 50[HP], and a switching surge generator was built to consider the voltage distribution. The results of EMTP analysis compared with experimental results.

• 항공우주시스템공학회지
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• 제15권1호
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• pp.32-39
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• 2021

전기추진 항공기는 기존 가스터빈 엔진에 의한 환경 및 소음 문제를 해결하기 위해 최근 항공분야에서 활발히 연구가 진행되고 있다. 특히 전기 동력추진 시스템의 핵심 구성품인 추력 모터와 이를 구동하기 위한 인버터에 대한 연구가 활발히 진행되고 있다. 이에 본 논문에서는 무게와 부피에 민감한 항공기 특성에 맞는 비출력이 높은 모터를 선정하고, 전력 소자에 따른 인버터 전력 손실을 시뮬레이션 하였다. 시뮬레이션은 전력전자 분석 툴인 PSIM을 이용하여 선정된 모터와 전력 소자를 모델링하여 스위칭 주파수에 따른 인버터 전력 손실을 분석 하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.34-39
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• 1998

This paper describes the simulation approaches employed for a vector control system of induction motor drive using SIMNON for windows program. SIMNON program tool can solve differential and difference equations for nonlinear dynamical control system. One powerful feature is its ability of allowing integration of individual program modules after each individual module is programed and tested independently. This particular feature is exploited here for an SVPWM inverter drive by real-time modeling and simulation. The suggested programs are provided a simple and complete simulation for induction motor vector drive system.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.107-109
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• 2006

The purpose of this paper is to introduce the new products for replacing on the old technical cooperation products which have 24 kinds of industrial inverter model. The core algorithm for vector control and sensorless control and the operation program for LCD operator have been developed. Through the continuous test, the improvement of speed/torque control performance and the control program for special target loads will be performed.

• 설비공학논문집
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• 제13권3호
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• pp.153-159
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• 2001

A system simulation program was developed for a multi-type inverter heat pump. Electronic expansion valve(EEV) was used to extend the capacity modulating range of the heat pump as expansion device. The program was also developed to calculate actual system performance with the building load variation with climate during a year. The performance variation of a multi-type hat pump with two EEV and an inverter compressor was simulated with compressor speed, capacity, and flow area of the EEV. As a result, the optimum operating frequency of the compressor and openings of the expansion device were decided at a given load. As compressor speed increased, he capacity of heat pump increased, the capacity of heat pump increased. Therefore flow area of EEV should be adjusted to have wide openness. Thus the coefficient of performance(COP) of the heat pump decreased due to increasement of compressor power input. The maximum COP point at a given load was decided according to the compressor speed. And under the given specific compressor speed and the load, the optimum openings point of EEV was also decided. Although the total load of indoor units was constant, the operating frequency increased as the fraction of load in a room increased. Finally ad the compressor power input increased, the coefficient of performance decreased.

• 한국정보통신학회논문지
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• 제16권9호
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• pp.1915-1922
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• 2012

본 논문에서는 AJAX(Asynchronous JavaScript And XML)를 이용하여 태양광 인버터의 모니터링 시스템을 구현하고자 한다. AJAX는 DHTML(Dynamic Hyper Text Makeup Language)과 다른 자바스크립트 기술 등과 함께 RIA(Rich Internet Application)를 만들 수 있는 기술 중 하나이다. 이를 사용하여 일반 응용프로그램에 필적하는 강력한 응용프로그램을 만들 수 있다. 기존의 데이터 처리 기법으로는 동일 페이지에서 데이터의 Request와 Response를 동적으로 처리할 수 없다. 하지만 비동기 통신 방법인 AJAX 기반 기술을 이용하면 직관적이며 데이터 변동 상태를 실시간으로 제공하기 때문에, 한 페이지 내에서 모든 기능을 실행할 수 있고 페이지 전환 없이 데이터 전송량이 현저히 작은 AJAX를 사용하여 효율적인 관리 및 모니터링 할 수 있기 때문에 태양광 인버터모니터링 시스템에 AJAX를 적용하여 효율적인 모니터링 시스템을 구현하였다.