• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.8
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• pp.1356-1361
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• 2008

A switched reluctance generator(SRG) has simple magnetic structure, and needs simple power electronic driving circuit. But, a SRG are no windings or permanent magnets on the rotor, and there are concentrated windings placed around each salient pole on the stator. Because of the characteristics of time-sharing excitation, the control of SRG is very flexible. And there are several parameters for controlling SRG, such as switch turn-on angle, switch turn-off angle, and exciting voltage and controlling mode, all these will affect the generation greatly. A SRG has positive torque at increasing inductance region and negative torque at decreasing inductance region. In this paper, we studied characteristics about the switch turn-on and off angles according to switch method for constant output voltage of the fixed speed SRG. It is the acoustic noise and torque ripple characteristics. Characteristics for a switch angle and method are presented by experiment using a 50W SRG with 12/8 poles.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.12
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• pp.1866-1872
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• 2017

This paper presents the design of in-wheel type Switched Reluctance Motor (SRM) which can be used as both traction motor and power pickup device in a wireless charging system of electric vehicles. The SRM acts as a traction drive in driving mode and a power receiver in charging mode to avoid any additional weights. Double stator axial field SRM is used due to its structure that can be mounted inside the wheel. The charging circuit is integrated with the asymmetric converter and phase windings of SRM, reducing the cost and size of the system. Magnetic resonance is implemented to increase the efficiency. Simulations done in Maxwell and Simplorer verify the effectiveness of the proposed system.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.8
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• pp.8-12
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• 2005

This paper designed electronic ballast inverter circuit using the PSpice simulation and it compared with practical ballast about electrical characteristics. Used electronic ballast driving type is self-exciting half bridge inverter we have got much the same electrical result both simulation and experiment of practical electronic ballast.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.393-394
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• 2015

본 논문은 다중 채널 LED(Light Emitting Diode) 구동을 위한 모듈형 전류 평형 회로를 제안한다. 기존 방식은 DC/DC 컨버터단과 다중 채널 LED 전류제어를 위해 각 채널마다 일정한 전류 제어를 하는 LED 드라이버단의 직렬 연결로 구성된다. 하지만 제안회로는 캐패시터의 전하평형원리에 의해 단일 채널 전류 제어로 모든 채널의 LED 전류를 동일하게 제어할 수 있어 DC/DC 컨버터와 LED 드라이버단을 하나로 통합한 단일 전력단 LED 구동회로 구성이 가능하며, 이는 회로구성의 단일화로 소자수 및 사이즈의 소형화가 가능하다. 또한 수동소자만으로 이루어진 모듈형 회로로써 모듈의 추가에 따라 요구되는 LED 채널 수 만큼 다채널 모듈로 확장할 수 있다. 제안회로의 타당성 검증을 위해 1kW급 LED 구동회로에 적용한 시뮬레이션 결과를 제시한다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.421-422
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• 2007

The fringe electric field driven transflective liquid crystal display with dual orientation has a problem that the voltage-dependent transmittance and reflectance curves do not match each other, requiring a dual driving circuit to achieve a high electro-optic performance. Optimizations of the electrode structure in the array substrate and rubbing direction solve this problem so that the transflective display with a single gap and a single gamma curve for reflective and transmissive region is possible.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.770-772
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• 1993

This paper is a study of a reactive-power compensator. It make using Power-MOSFET that be little quantity driving-power, easy to control, and be passible to highspeed wich be capable to achieve a reactive power compensator, to get rid of harmonics. On account of having no particular control circuit, composing not need to energy storage element and feedback control compered the previous power transformer in the system organization. It efficiqntly ueed to be in power factor compensation variable load.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.911-912
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• 2007

영구자석형 조작기(PMA)의 단점을 보완한 고전압 차단기용 전자석 조작기인 EMFA는 긴 스트로크를 가지는 차단기에도 사용이 가능하며, 특히 진공 차단기(VCB)용 조작기를 비롯하여, 가스 차단기(GCB)에 적용한 모델도 이미 개발되었다. 다양한 모델에 대한 설계 및 연구가 추가적으로 진행되고 있으나, 아직 설계 방법이 정형화되어 있지 않아 모델에 따라 그 형상이 달라지는 경우가 많다. 이러한 점을 개선하기 위해, 본 논문에서 EMFA의 설계 변수를 변화시켜 가며 나타나는 특성을 홀딩력과 자속밀도를 통해 분석하였다. 나아가 이를 바탕으로 설계 방법의 정형화에 대한 실마리를 제공하고자 한다. 해석에는 2차원 유한요소법을 이용하였고, 설계 변수는 조작기의 초기상태를 기준으로 설정하였다.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.80-82
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• 2005

This paper presents the dynamic characteristics of a linear brushless DC(BLDC) motor with permanent magnet excitation for the precision conveyor according to the load condition. In order to investigate the accurate dynamic performance of tile linear BLDC motor driving with 6 step inverter- fed, finite element techniques coupling with external circuit models, together with the simultaneous simulation of motion of the mover system, arc proposed. The results of finite element analysis arc compared to the experimental ones.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.05a
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• pp.54-57
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• 2005

We have designed a single gap transflective liquid crystal display (LCD) driven by a fringe electric field, in which the +LC (${\Delta}{\varepsilon}$=7.4, rubbing angle= $80^{\circ}$) is homogeneously aligned in the initial state. This device is a problem that the voltage-dependent transmittance and reflectance curves do not match each other. Thus a dual driving circuit is required. This study shows that optimization of the rubbing angle in the transmissive and reflective regions solves this problem so that the transflective display with a single cell gap and single gamma curve for reflective and transmissive region is possible.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1141-1143
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• 2005

This paper presents the reasonable design parameters of a SRM for hybrid electric vehicle driving. For the design of SRM, the initial model is designed using the equivalent magnetic circuit method. In order to optimize the SRM for HEV. The initial model is redesigned by FEM with the variation of the stock length and turns of winding. This paper shows that a flat-topped current of a phase can be made from a change of the stack length and the number of turns for high efficiency, high average torque and a lower torque ripple. The change of current falling time as a variation of turn-off angle was shown by FEA. The iron loss and copper loss were described. The torque of the redesigned motor is suitable for low and high speed ranges to drive a HEV that was verified by the speed-torque curve.