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조준익,전병실 한국통신학회 1988 韓國通信學會論文誌 Vol.13 No.6
본 논문에서는 PWM인버터의 임의의 고조파를 제거할 때 프리에급수를 이용하여 비선형 연립방정식을 선형 연립방정식으로 바꾸던 것을 왈쉬급수를 이용하여 임의의 고조파를 제거하는 새로운 방법을 제시하였다. PWM인버터의 고조파제거에서 왈쉬급수를 이용하여 파형을 분석하고, 왈쉬급수와 프리에급수를 이용하여 비교 분석하였으며, 또한 단상 PWM인버터의 출력파혀을 왈쉬급수를 이용하여 시뮬레이션하고 실험을 통하여 임의의 고조파가 제거됨을 확인한다. This paper describes a new method to eliminate some selected harmonics in PWM waveforms using the Walsh series which substitute the linear algebraic equations for the nonlinear equations required in the Fourier series harmonic elimination. In addition, this method is simulated to synthesize periodic PWM waveforms and compare the Walsh analysis with the FOurier analysis, Experimental results are shown that a singel-phase PWM waveforms are identified with the proposed Walsh Series.
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趙俊翼 군산대학교 1984 群山水産專門大學 硏究報告 Vol.18 No.3
Recently we have been studied on the programmable control that used a microprocessor. The motor speed control should be achieved by the microprocessor in a vessel bridge. In this paper, a motor drive circuit is designed for the microprocessor control and pictured the programmable Ac waveforms to profit speed control for the thyristr turn-on. The shifted waveforms insulated by the pulse transformer for the thyristor turn-on. Output wave-forms had a little distortion by any surge voltage shown in Fig. 10 and Fig.11.
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프리에 급수와 왈쉬 급수를 이용한 PWM인버터 파형의 분석
조준익 군산대학교 1988 群山水産專門大學 硏究報告 Vol.22 No.2
This paper describes a new method to eliminate selected harmonics in PWM waverform using Walsh series which substitute linear algebraic equations for the nonlinear equations required in Fourier series harmonics elimination. In addition, this method is simulated to synthesize the periodic PWM waveform and compare Walsh analysis with Fourier analysis.
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조준익 군산대학교 1986 群山水産專門大學 硏究報告 Vol.20 No.3
Rating the entrance into a matriculation desired a promptitude, and accuracy. We have translated it by various hands and occupied on the work very long time. Microcomputer programming using APPLE-][ bring forth the advantage that improve promptitude and accuracy of rating work. In this paper, the program with respect to rate decision of the entrance mark is investigated. The program consists of two parts, marking and sorting, and one of executed examples is shown.
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조준익,전병실,Joe, Jun-Ik,Chon, Byoung-Sil 대한전자공학회 1990 전자공학회논문지 Vol. No.
PWM 인버터에서 임의로 선택한 5,7,11차 고조파를 제거할 때, 후리에 급수를 이용하여 비선형 연립방식을 선형 연립방정식으로 바꾸어 점호각을 분석하던 기존의 방법으로부터 새로운 방법을 구현하였다. 후리에 급수를 이용하여 기억소자에 점호각을 look-up 표로 기억시키거나, 또는 점호각 계산 프로그램을 반복 수행하여 점호시각에 트리거하던 기존의 방법으로는 실시간 제어가 곤란하였다. 본 논문에서는 제안된 왈쉬 급수를 이용하여 점호각을 계산하고 하드웨어로 구성하여 입력되는 클럭 주파수만 가변하면, 즉시로 가변된 주파수가 출력되므로 실시간 제어가 가능함을 밝혔다. 또한 Ordered orthogonal 함수를 이용하여 단상회로와 동일한 하드웨어 구성으로 3장 출력이 가능함을 실험을 통하여 확인하였다. This paper describes a new method to eliminate some selected harmonics (5,7,11) in PWM waveforms using Walsh and related orthogonal functions. Previous analyses of PWM waveforms are based on the nonlinear equations requiring iterative solution methods which are not practical in real-time systems. In addition, synthesis of low harmonics waveform at high power system is not easy to implement with power electronic hardware. The goal of this paper is to achieve the harmonics elimination in a PWM waveform by replacing the nonlinear equations in Fourier analysis with linear algebraic equations resulting from the use of orthogonal Walsh equation. This paper also describes how to synthesize low ordered harmonic waveforms with practical power electronic hardware. Walsh and Radmacher functions are easily manipulated by Harmuth's array generator, and those algorithms are accurate, computationally efficient and faster than algorithm based on Fourier analysis. In addition, this method is simulated to synthesize periodic PWM waveforms. From the experi-mental results, it is shown that single-phase PWM waveform are identified with the proposed method. And these methods are also extended to three-phase PWM waveforms in this paper.
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PWM인버터에서 Notch Angle의 분석에 관한 연구
조준익 군산대학교 1987 群山水産專門大學 硏究報告 Vol.21 No.1
This paper described the improvement of a pulse-width modulation (PWM) inverter output waveform for the reduction of the harmonics in the inverter-fed drive systems. The theory is based on the minimization of the current harmonics in the motor by a proper choice of the switching angles (notch angles). Switching patterns are calculated for 1 to 6 chopping number per periode. Comparisions and analyses are made of the results obtained with those given by conventional PWM technical using.
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趙俊翼,咸喆株 군산대학교 1991 群山水産專門大學 硏究報告 Vol.25 No.2
This paper presents the design, implementation and application of a microcomputer- based interactive digital controller development system. A microcomputer- based incremental servo system with a discrete variable structure for motor speed is presented with respect to the dynamic response and accuracy of controlled speed. Complicated digital control algorithm can be synthesized by using fundamental software building blocks. It is concluded that a robust DVSS (Discrete Variable Structure System) digital controller for motor speed control can be practically designed and implemented with currently available technique and hardware. The experimental results show that usage of DVSC (Discrete Variable Structure Controller) can greatly improve the transient performance of the system.
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趙俊翼 군산대학교 1983 群山水産專門大學 硏究報告 Vol.17 No.3
The operation of phase-locked loop(PLL) systems is described in the paper. By PLL method on to a reference frequency, speed accuracies of 0.002 percent are possible. A complete speed control system employing a 3-HP motor has been designed and tested in the laboratory and the system gives satisfactory performance. The principle can be extended to three-phase system with higher horse-power drives, or to other phase-controlled converter circuits.
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趙俊翼,金仁洙 군산대학교 1993 群山水産專門大學 硏究報告 Vol.28 No.1
This paper explores the method of estimating the velocity of ultrasound in biological tissue. Special attention is paid to the influence of frequency dispersion. The frequency dispersion effect has been characterized by the many researchers. But the papers are few on the method of eliminating the effect. In this paper, the group delay function for a pulse-echo signal is derived from the phase of the courier transform of the signal. The mean value of group delay function corresponds to the slope of the linear phase component in the phase function. Therefore, the dispersion effect contained in the pulse-echo signal is elminated by measuring the group delay function.
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