• The Journal of Korean Institute of Communications and Information Sciences
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• v.16 no.2
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• pp.145-154
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• 1991

In this dissertation, the same reading and writing operation of general SRAM, the algonthm and hardware of 8 bit $\times$16 word CAM(Content Addressable Memory) which carry out the parallel that search is presented. The designed CAM chip consists of five functional blocks (CAM cell array, Address Deceden, Address Encoden. Data Selector, Sense Amplifier). The smulation is performed using logic smmulator on Apollo workstation and PSPICE eitcut simulation on PC/AT. The designed CAM was fabricated by 3um CMOS N Well process (ETRI) design nitles and testing was performed.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.311-314
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• 2004

A new type of high frequency wideband ultrasonic transducer with a separation between a transmitter and a receiver was proposed and its characteristics were simulated using the PSpice model. The piezoelectric ceramic $PbTiO_{3}$ as a transmitter and the piezoelectric copolymer P(VDF-TrFE) as a receiver were used for high sensitivity and wide bandwidth, respectively. The characteristics of a center frequency approximately 40MHz focusing transducer fabricated in this study showed very wide bandwidth which could give an axial spatial resolution better than 30um in the B-mode image for biological tissues.

• Proceedings of the KIEE Conference
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• 2003.04a
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• pp.318-320
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• 2003

This paper presents a novel single-stage high frequency resonant DC-DC converter using zero voltage switching with high input power factor. The proposed high frequency resonant converter integrates half-bridge boost rectifier as power factor corrector (PFC) and half-bridge resonant converter into a single stage. The input stage of the half-bridge boost rectifier is working in discontinuous conduction mode(DCM) with constant duty cycle and variable switching frequency. So that a high power factor is achieved naturally. Simulation results through the Pspice have demonstrated the feasibility of the Proposed DC-DC converter. This proposed converter will be able to be practically used as a power supply in various fields as induction heating applications, DC-DC converter etc.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.516-518
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• 1994

A new class of zero-voltage switching (ZVS) pulse width modulated (PWM) half-bridge converter is investigated. The new converter is capable of switching zero voltage and keeping advantages of quasi-resonant half-bridge converter while maintaining constant frequency operation. The theoretical analysis of a ZVS PWM half bridge converter is presented and is verified by PSPICE simulation results.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.385-390
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• 2004

In this paper, electronics ballast using double resonant inverter for 250[W] MHD lamp is designed and implemented. Electronics ballast reduce a turn -on/offf loss by using ZVS(Zero Voltage Switching) technic in the double resonant inverter, and when circuit have a analysis, the characteristic evaluations is described generally by using the normalized parameters used numerical analysis. We conform a rightfulness of theoretical analysis by comparing theoretical waveforms and Pspice waveforms and experimental waveforms, double resonant inverter for 250[W] MHD lamp is operated safely.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.10a
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• pp.407-410
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• 2009

A piezoelectric device which converts mechanical vibration energy into electrical energy is able to harvest energy and the usable energy is mW ${\sim}$ W, hence a converter is necessary to acquire the energy efficiently. Various limited conditions should be considered for the design of AC/DC converter for energy harvesting of a piezoelectric device supplying small amount of energy. In addition to simple structure, compact size, light weight and high efficiency, the energy harvesting AC!DC converter should adopt the technique of self operating, in which only the harvested energy from the piezoelectric device is available. This paper proposes new AC/DC resonant boost converter to harvest efficiently electrical energy from mechanical vibration energy, analyzes the operating characteristics of the converter and proves its feasibility for energy harvester with PSPICE simulation and experiment.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.10a
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• pp.327-329
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• 2009

A first short stoke current which has a 10/350 ${\mu}s$ waveform is able to be generated by using the crowbar switch in R-L-C circuit. In this paper, a peaking circuit has been applied to make crowbar switch. Operate effective for generating 10/350 ${\mu}s$ waveform. According to simulation with PSpice, we have found that some value of inductance were more effective to trigger a crowbar switch. As a result of experimental test using crowbar switch with peaking circuit, the success rate of triggering crowbar switch is higher than the normal crowbar switch without peaking circuit.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.05a
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• pp.170-173
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• 2005

본 논문에서는 E급 영전압 스위칭(zero-voltage-switching) 인버터 방식의 타려식 형광램프용 전자식 안정기를 설계하였다. 이론을 통하여 각 파라미터 값을 산출하고, PSpice를 이용한 시뮬레이션을 통하여 램프 출력을 예측하였으며, 실제 안정기를 제작하여 전기적 특성을 살펴보았다.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.69-71
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• 2009

본 논문은 부하전압의 크기에 따라 동작모드가 다르게 구성되는 공진형 DC/DC 컨버터의 동작 특성을 해석한다. 공진형 DC/DC 컨버터는 직류 입력전원에 연결되는 LC 공진회로, 공진회로의 캐패시터 전압이 최대일 때 부하측으로 에너지를 전달하는 공진형 컨버터로 구성되어있다. 공진형 컨버터는 공진 회로의 캐패시터 전압과 부하전압의 상대적인 크기에 따라서 2개의 동작 모드 특성을 가진다. 공진 캐패시터 전압의 최대값이 부하전압보다 작을 경우, 스위칭 회로는 부스트 인덕터를 이용하여 입력측 에너지를 부하측으로 전달한다. 반대로 큰 경우에는 스위칭 동작없이 공진 캐패시터가 부하측으로 직접 연결되어 입력측 에너지를 부하로 전달한 후, 공진 캐패시터의 잔여 에너지를 부스트 인덕터를 이용하여 부하측으로 전달한다. 공진형 DC/DC 컨버터 회로의 동작원리를 설명하고, PSPICE Simulation 및 실험을 통하여 검증하였다.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.374-377
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• 2010

HID 램프는 광원 1개당 방출되는 광속이 많고 광원효율 또한 높은 광원이며 긴 수명에 경제성까지 우수한 특징을 가지고 있어서 높은 밝기가 요구되는 대규모 공장등에 사용되고 있으며 자동차의 전조 등 등에도 많이 사용되고 있다. HID의 전원부에 압전 변압기를 적용하여 경량, 소형이며 고효율의 전원부를 구현하고자 하였다. 기존의 HID 및 압전 변압기는 시뮬레이션에서 일반 저항부하와 변압기를 이용하여 개략적인 동작을 확인하는데 만족하였다. 본 논문은 압전 변압기와 HID의 전기적 등가회로에 의한 정밀한 PSPICE 모델을 제시하였고, 손쉽게 변수값을 수정하여 다양한 모델에 적용할 수 있도록 구성하였다.