• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.442-445
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• 2003

본 연구에서는 엑시머 레이저 여기용으로 40 J급 자기펄스압축시스템(WC : magnetic pulse compression system)을 개발하고, MPC의 각단에서 최적조건을 구하였다. MPC 시스템은 DC 전원 공급기, 펄스 트랜스, 네 단의 포화인덕터로 이루어져 있다. MPC 각 단에서 포화인덕터의 회전수는 140회, 26회, 5회와 1회이며, 각단에서의 최적 용량는 각각 34 nF, 28.9 nF, 22.1 nF, 22.1 nF이다. MPC 시스템의 개선으로 우리는 43 kV의 전압, 8.25 kA의 전류와 360 ns의 펄스폭을 얻을 수 있었으며, 이때 최대 펄스 압축율은 77.7, 전류 이득은 71.7이었다.

• 동력기계공학회지
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• 제13권4호
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• pp.62-67
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• 2009

In this paper we designed a prototype hybrid type linear pulse motor (HLPM) with single side stator structure for low cost. The measurement system which can get the motor characteristics of the HLPM was suggested. The static and dynamic characteristics of the thrust force are measured analyzed. And the microstep drive method is adopted and tested to the drive of prototype HLPM. The thrust waveform is measured respectively to know the differences of the thrust waveform between the microstep drive method and rectangular wave. From the experimental results, it can be confirmed that the repetitive ripple of the thrust force of the prototype HLPM is reduced by taking the microstep drive method.

• 전력전자학회논문지
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• 제11권6호
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• pp.489-493
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• 2006

이 논문의 목표는 최적의 효율을 갖는 PLS 구동 인버터 회로를 설계하는 것이다. 일반적으로 펄스로 구동되는 PLS가 높은 광변환 효율을 갖는다고 알려져 있다. 낮은 듀티비의 펄스를 만들 수 있는 회로로는 E급 공진형 인버터와 세미브리지 인버터가 있다. 이 논문에서는 위의 두 회로의 손실을 분석한다. 손실분석을 확인하기 위해서 220V 380W 입력소비전력을 갖는 인버터 회로를 제작하고 시험하였다. 실험결과를 통해서 높은 효율의 PLS 시스템을 확인했다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 추계학술발표회
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• pp.915-916
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• 2005

The high power RF system for the PEFP 20MeV proton accelerator composed of the 3MeV RFQ and the 20MeV DTL has been installed. The klystron for the RFQ was tested up to 600kW and operated routinely to drive the RFQ in a pulse mode operation. The klystron for the DTL which consists of 4 tanks was tested up to 800kW in pulse mode operation. The pulse width and repetition rate was 50${\mu}s$ and 1Hz respectively. The high power RF system has been operated to drive each accelerating structure and will be used to accelerate 20MeV proton beam.

• 한국항행학회논문지
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• 제20권4호
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• pp.265-274
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• 2016

본 논문에서는 태양광과 풍력을 조합한 하이브리드 발전시스템을 이용하여 승압 쵸퍼와 PWM (pulse width modulation) 전압형 인버터인 전력변환기로 구성하였고, 또한 PWM 전압형 인버터는 태양전지가 연속 발전할 수 없는 단점을 보완하기 위해 일반 상용전원과 연계하고 에너지저장장치 (ESS; energy storage system)를 상시 운영하여 공항의 기상 변화에 따른 파장별 LED 항공 유도등을 효율적으로 운용하는 시스템을 구성 하였다. 태양전지에 대한 특성 해석과 수학적 모델링을 통한 시뮬레이션을 행하여 태양전지 특성 사양과 비교하였고, PWM 전압형 인버터와 위상동기를 위해서 계통전압을 검출하여 계통전압과 인버터 출력을 동상 운전하므로 잉여전력을 계통과 연계할 수 있게 하였으며 공항의 활주로, 항공 유도등에 적용하여 양호한 동특성을 얻을 수 있는 제어회로를 동시에 개발하여 항공유도등의 다양성을 추구할 수 있음을 확인 하였다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1990년도 추계학술대회
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• pp.118-121
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• 1990

This paper describes development of an implantable power switching system for biotelemetry system. This system is designed and manufactured to achieve as small size and low power dissipation as possible, using pulse powered circult and CMOS technology. The function of the power switching system is to connect the implantable battery to implanted sensors and, electronics systems by receiving intermittent command signals from external circuits. The power dissipation of this system was about $15{\mu}W$ for a stand-by operation.

• 대한전기학회논문지:전력기술부문A
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• 제55권3호
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• pp.102-108
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• 2006

This paper proposes a 36-pulse back-to-back voltage source converter using four sets of 12-pulse bridges with pulse-Interleaving auxiliary circuit. The proposed back-to-back voltage source converter has an independent control capability of active power and reactive power at the at connection point. The principle of increasing the number of pulses was analyzed using theoretical approach. The operational feasibility of proposed system was verified through computer simulations with PSCAD/EMTDC software. The proposed back-to-back converter can be widely used for the HVDC and FACTS devices.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2204-2206
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• 1999

Pulsed Nd:YAC laser is used widely for materials processing and instrumentation. It is very important to control the laser energy density in materials processing by a pulsed Nd:YAG laser. A pulse repetition rate and a pulse width are regarded as the most dominant factors to control the energy density of laser beam. In this study, the alternating charge-discharge system was designed to adjust a pulse repetition rate. This system is controlled by one chip microprocessor and allows to replace an expensive condenser for high frequency to a cheap condenser for low frequency. In addition. we have investigated the current pulse shape of flashlamp and the operating characteristics of a pulsed Nd:YAG laser. As a result, it is found that the laser output of the power supply using the alternating charge-discharge system is not less than that of typical power supply. As the pulse repetition rate rises from 30pps to 120pps by the step of 30pps at 1200V, it is found that the laser efficiency decreases but the laser output power increases about 6W at each step.

• 한국표면공학회지
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• 제34권5호
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• pp.395-402
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• 2001

An induction thermal plasma system have been newly designed for advanced operation with a pulse modulated mode to control the plasma power in time domain and to create non-equilibrium effects such as fast quenching of the plasma to produce new functional materials in high rate. The system consists of MOSFET power supply with a maximum power of 50 kW with a frequency of 460 kHz, an induction plasma torch with a 10-turns coil of 80 mm diameter and 150 mm length and a vacuum chamber. The pulse modulated plasma was successfully generated at a plasma power of 30 kW and a high pressure of 100 kPa, with taking the on and off time as 10 ms, respectively. Measurements were carried out on the time-dependent spectral lines emitted from Ar species. The dynamic behavior of plasma temperature in a pulse cycle was estimated by the Boltzmann plot and the excitation temperature of Ar atom was found to be changed periodically from around 0.5 to 1.7 eV during the cycle. Two application regions of the induction thermal plasma newly generated were introduced to material processing with high rate synthesis based on non equilibrium effects, and to the finding of new arc quenching gases coming necessary for power circuit breaker, which is friendly with earth circumstance alternative to SF6 gas.

• Journal of Power Electronics
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• 제2권4호
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• pp.288-296
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• 2002

In this paper, a high frequency transformer - assisted auxiliary active resonant commutated snubber (HFTA-ARCS) for voltage source soft switching pulse width modulated power conversion circuits is presented. A three phase voltage source type soft switching inverter incorporating HFTA-ARCS circuits in its three bridge legs can reduce current rating of auxiliary active power switches and has sensorless simplified control scheme which any specified boost current management is not required for soft switching. Its operation principle and digital control scheme are described and a practical design method of circuit parameters on this HFTA-ARCS circuit is also introduced on the basis of computer simulation. Moreover, this space voltage vector modulated soft switching inverter system with DSP-based digital control scheme Is discussed and its effectiveness is proved on the basis of performance evaluations. The operating performances of this inverter system are also compared with those of conventional three-phase hard switching inverter under practical conditions of specified parameters.