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A Study of Real-Time SHE-PWM Pattern Using Ordered Orthogonal Function (직교함수를 이용한 실시간 SHE-PWM 패턴 형성에 관한 연구)

  • Kim, Dae-Ik;Lee, Sang-Tae;Joe, Jun-Ik;Chon, Byoung-Sil
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.33B no.1
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    • pp.195-200
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    • 1996

  • In this paper, to eliminate some selected harmonics, we implement PWM inverter which can be able to control in real-time. Using walsh function, which is one of the ordered orthogonal functions, we propose a new method to calculate firing angles, and implement logic circuits which can be calculate firing angles in real-time and be applicable to 1- and 3-phase circuits. Finally, using simulation circuits which accept the outputs obtained from the implemented logic circuits as the inputs, we confirmed the characteristics in steady state of the proposed method for PWM inverter.

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압전형 가속도 센서의 잡음 대책

  • 곽증효;최동수;김점호;손은영
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1991.10a
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    • pp.90-93
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    • 1991

  • 압전형 가속도 센서(AMP 내장형 PA-01)의 전원 NOISE 영향은 가속도 센서의 금속부 구조 및 내장된 임피이던스 변환기의 역할을 하는 내장 AMP의 차페성 저항등에 원인에 있었다. 이 전원 NOISE 영향을 저하시키기 위하여 가속도 센서부의 UNIT CELL과 HOUSING 본체와의 절연 저항을 600㏁ 이상 되게하여 절연성 향상 및 임피이던스 변환기의 차페로 인하여 전원 NOISE 영향을 1/200∼1/2000 정도로 감소시킬수 있었다. 이때 UNIT CELL과 HOUSING 본체와의 절연 처리오 NOISE차페효과로 1/20 정도로 줄일 수 있었으며, 내장 AMP 차페로는 1/10∼1/100의 노이즈 차페효과를 얻을 수 있었다.

Firing Angle Control of Soft Starter for Reduction of Inrush Current during Induction Generator to Gird (유도발전기 계통 연계시 돌입전류 저감을 위한 소프트 스타터 점호각 제어)

  • Kwon Tae-Hwa;Song Seung-Ho
    • Proceedings of the KIPE Conference
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    • 2003.11a
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    • pp.230-233
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    • 2003

  • Simulation model of induction type fixed speed wind power generator is developed. It is shown that the peak value of inrush current during start up changes according to the firing angle control strategy of soft starter. New proposed firing angle control scheme showed $25\%$ of reduction of peak current which results in smaller drop of gird voltage at the point of common coupling during start up.

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On the Mass Transfer of Nicotine in Smoking Cigarette (흡연 궐련중의 니코틴이행에 관하여)

  • 김찬호;유점호;반유선;류익상
    • Journal of the Korean Society of Tobacco Science
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    • v.3 no.2
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    • pp.83-88
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    • 1981

  • Transfer of nicotine into the mails stream of smote in Korean commercial cigarettes was investigated. The mass transfer of nicotine into tile main stream of smote and accumulation of nicotine in cigarette filler got higher as the puffing number increased. Only about 14oyo of nicotine ill a cigarette was puffed into mouth end. and the rest of the nicotine went to side stream of smote or converted to other volatile bases.

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