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백형래,박수강 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1
Single-Phase diode rectifiers are widely used in industry. These rectifier, however, generate many harmonic components in the AC Power line and have the poor input power factor, which may create a power quality problem for other electrical apparatus in the vicinity of the rectifier. Power factor improvement and harmonic reduction in the AC line current have become very significant problems in single-phase diode rectifiers. In this paper, the high power factor boost converter using soft switching is proposed t o improve the demerit. The simulation results show the validity of the proposed system.
백형래,조금배,유권종 조선대학교 동력자원연구소 1993 動力資源硏究所誌 Vol.15 No.2
In the photovoltaic power system the maximum power control is necessary because output power of solar cell array is varied by solar insolation and temperature. The high frequency operation is essential for the development of the controller. However the e-i characteristics of Solar Cell Array have hysteresis in high frequency operation. It makes controller which is operated by conventional control method uncontrollable. Therefore, it is indispensable to develop a new control method to obtain maximum available power from solar cell array. The simulation result shows the effectiveness of controller using two-state value control method.
원칩마이크로컨트롤러를 이용한 단상유도전동기의 기동시스템 구현
백형래,박수강,최낙일 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.2
A single phase induction motor(SPIM) with two windings, main and auxiliary is probably the most widely used motor in the world due to their ruggedness, low maintenance and simplicity of construction. There are several ways of starting single phase motors. The most popular arrangements is centrifugal switch. An auxiliary winding connected in series with a capacitor, is brought into the circuit during starting. The closing and opening of the switch must be speed dependant. The switch meets the speed requirements, but it also has many drawback: random switching, arcing, many models necessary for different speeds and shaft diameters, space required inside the motors and limited lifetime to name some of them. In this paper, authors present the experimental results of the SPIM under controlling of currents of main and auxiliary windings by using a one-chip micro starter. This new starting method is developed to replace the conventional starting device consisted with a mechanical switch and a capacitor. In mentioned method the soft-starting of SPIM is simply implemented and higher efficiency is obtained in comparison with conventional condenser type SPIM.
입력전력제어에 의한 단상유도전동기의 효율개선에 관한 연구
백형래,박수강 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1
The paper presents a new drive for single-phase induction motor and a one-chip micom-based controller and control method for self-starting and Input power saving of single-phase induction motor driven from a phase angle control is described. The controller is capable of motor operating in the maximum efficiency region as well as in the optimal input power region. The implementation of the microprocessor is based on an 8-bit programmable micro-controller in low cost. The proposed method is based on the optimal efficiency control which is running by variable phase angle of main winding current of single-phase induction motors. The variable phase angle switching strategy more economized for self-starting and phase angle control of the motor than the PWM switching strategy in high cost. The implemented system consists of TRIAC for voltage control, starting capacitor, 8bit one-chip microcontroller for maximum efficiency control. Experiments are focused on a capacitor starting single-phase induction motor, the optimal Input energy saving by variable phase angle control are verified by experimental results. Also, auxiliary winding was controlled by electronic starting switch.
백형래,박수강,최연옥,한엄용,이성길 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1
Single-Phase diode rectifiers are widely used in industry. These rectifier, however, generate many harmonic components in the AC Power line and have the poor input power factor, which may create a power quality problem for other electrical apparatus in the vicinity of the rectifier. Power factor improvement and harmonic reduction in the AC line current have become very significant problems in single-phase diode rectifiers. In this paper, the high power factor boost converter using soft switching is proposed to improve the demerit. The simulation results show the validity of the proposed system.
전력용 트랜지스터를 이용한 비대칭 PWM 3상 교류초퍼에 관한 연구
白亨來 건국대학교 1990 論文集 Vol.30 No.1
A control technique of asymmetical PWM AC chopper is proposed which not only eliminates the harmonic current, but also improves the input power factor. The ideal switching function for the proposed technique is derived and converted into asymmetrical PWM pattern for practical implementation of AC chopper. Digital simulation is performed to investigate the theoretical characteristics of the proposed APWM technique. The asymmetrical PWM technique is compared to the symmetrical that at the three phase AC chopper.
신경회로망을 이용한 평면좌표계형 로보트구동용 교류서보전동기 제어기
김평호,백형래 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
This paper describes the controller for the improving speed control the AC servo motor. The microprocessor provides an output to the difference in command. The servo- system improves the characteristics of speed control. When the motor is running at the same speed as set by the reference signal, the speed encoder also provides a signal of the same frequency. Thus, the microprocessor controlled digital techniques enable to realize the flexible performance and control which was possible with time constant. We can know that PI control using neural networks by 80196 can control efficiently speed of AC Servo motor. Finally experimental results prove excellent performance of this control system. The system can be adaptable to CNC machine.
단상유도전동기의 최적 구동을 위한 디지털 위상각 제어기 설계
박수강,백형래,김평호 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
The availability of microcontrollers and switching power devices such as power MOSFET, IGBT, TRIAC, ect., offer improvement opportunities in the field of ac drive system control. In this paper, a microprocessor-based controller for self-starting and power saving single phase induction motor driven system from a variable phase angle power supply is described. The controller is capable of operating in the maximum efficiency region as well as in the optimal input power region. The implementation of the software is based on an PIC16C71 8-bit programmable microcontroller that has the potential of computing the switching instants on line an in real-time. The variable phase angle switching strategy more employed for self-starting and phase angle control of the motor than the PWM switching strategy. The performance of the developed system is evaluated using computer simulation on a 210W capacitor starting motor. Finally the validity and performance capability of the controller are experimentally demonstrated on a 210W single phase induction motor.
최규하,백형래,김한성 建國大學校 附設 産業技術硏究所 1992 논문집 Vol.17 No.-
Delta modulation technique for current-type active power filter is proposed which can not only eliminate the harmonic current but compensate the reactive power at the AC sides where the nonlinear loads are connected. The delta modulated current control can be used to improve both the response and the control capability of the injected compensating current for the active filter with constant current source. As a result the compensated ac line current becomes nearly sinusoidal and also the input power factor is improved roughly to unity.
이성길,백형래 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1
This paper deals with the output characteristics of resonant PWM inverter type X-ray generators connected to different DC power units i.e, a single phase full bridge rectifier. a three phase full bridge rectifier and a power storage unit(PSU). The quality of X-ray beam depends on the pulsating waveforms of DC voltage supplied to the X-ray tube. In a X-ray generator, the waveform of DC output voltage can be affected from harmonic distortion of DC input power. When a tube voltage waveform is distorted, the property of X-ray beam such as reproducibility, linearity and dose can be reduced. Therefore, this paper compared DC output waveforms and dose with three type of DC power units and show the experimental results in this paper.