• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 심포지엄 논문집 정보 및 제어부문
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• pp.19-21
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• 2004

This paper considers pulse width modulation (PWM) methods which are used in 3-phase brushless DC motor controller. Due to many disadvantages of bipolar PWM method, unipolar PWM method is mostly used in industrial field. In constant speed control application, the unipolar PWM method shows a good performance of speed control. But in the wide range of speed control application, it shows a poor performance especially when deceleration is needed. So we propose hybrid PWM method that utilizes two PWM methods according to the sign of speed controller output. The simulation and experimental result shows that the proposed method improves a speed control performance of the brushless DC motor which is applied to industrial sewing machines.

• 대한전기학회논문지:시스템및제어부문D
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• 제53권7호
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• pp.491-500
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• 2004

This paper considers a hybrid PWM(pulse width modulation) method which can be used in the brushless DC motor controller. Due to many disadvantages of bipolar PWM method, unipolar PWM method is mostly used in industrial field. In constant speed control application, the unipolar PWM method shows the good performance of speed control. But in the wide range of speed control application, it shows poor performance especially when deceleration is needed. So we propose the hybrid PWM method that utilizes both of bipolar and unipolar PWM methods according to the sign of the speed controller output. Simulation and experimental result show that the proposed method improves speed control performance of the brushless DC motor which is applied to the industrial sewing machines.

• Journal of Power Electronics
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• 제11권5호
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• pp.726-733
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• 2011

BLDC Motors are widely used in various speed control applications due to their ease of control and low cost. Generally, the unipolar PWM method is used for speed control applications. However, the unipolar PWM method has a current spike problem in the braking operation which can be a problem in speed reversal which generally happens in position control applications. However, the current spike problem can be solved by the conventional bipolar PWM method. Although the current spike problem can be solved, the conventional bipolar PWM method has the problem of a large current ripple. In this paper, a novel bipolar PWM method is proposed to solve this problem. The current ripple and the current spike problems are analyzed in this paper for the unipolar and bipolar PWM methods. At last, the merits of the proposed bipolar PWM method are proven by experiment.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.152-155
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• 2014

ABS/ESC 기능 통합 SoC에 사용되는 자동차 제동 솔레노이드 밸브 구동용 디지털 PWM 컨트롤러를 설계하였다. 직접 제어와 PI 제어 방식을 지원하도록 설계된 PWM 컨트롤러는 총 12채널로 구성된다. 직접 제어 방식의 6개 채널은 설정된 PWM 듀티값에 따라 일정한 PWM을 출력하며, PI 제어 방식의 6개의 채널은 설정된 전류값을 기준으로 드라이버의 전류 값에 따라 변화하는 PWM을 출력하여 일정한 전류를 갖도록 설계되었다. 또한 솔레노이드 밸브 열림 감지, Dither, PWM 위상 시프트 기능 등을 갖는다. 설계된 PWM 컨트롤러는 44,779 게이트로 구현되었으며, 0.18um CMOS 공정으로 제작된 칩의 측정 결과로부터 기능이 정상적으로 동작하는 것을 확인하였다.

• 한국정보전자통신기술학회논문지
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• 제11권3호
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• pp.295-300
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• 2018

기존에 BLDC모터의 속도 제어 알고리즘으로는 PI 제어 알고리즘이 많이 사용되어왔다. PI 제어 알고리즘의 경우 다양한 속도 변화에 대한 속도와 토크의 응답 특성이 느려, 정상상태에 도달하는 것이 느리다는 단점이 있다. 따라서 본 논문에서는 오버슈트가 조금 있지만 응답 속도를 개선해 정상상태에 빠르게 도달할 수 있는 PWM 퍼지 논리 제어 알고리즘을 제안하였다. PWM으로 응답속도를 줄이고, 퍼지 논리 제어 알고리즘으로 오버슈트를 최소화하였다. 제안된 PWM 퍼지 논리 제어 알고리즘은 DC 초퍼, PWM 듀티 사이클 조정기, 퍼지 논리 제어기 등으로 구성했다. 제안된 알고리즘의 성능과 타당성은 Matlab 2018a의 Simulink를 이용한 시뮬레이션을 통해 입증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 B
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• pp.585-587
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• 1998

It is suggested that the PWM inverter is controlled by Digital Software Programming. VVVF(Variable Voltage Variable Frequency) inverter control being used by PWM control for driving the motor with speed-varying, makes the PWM pattern with calculating the output voltage and frequency, and with controlling the carrier and signal, so actually this method is difficult to correspond with driving the motor by using voltage-varying and frequency-varying. Therefore this research suggested the new algorithm controlled by micro processor which is already stored by various PWM form of output voltage by using fundamental data of the carrier and signal. The PWM wave can be controlled with real time by using extra hardware and digital software and to speed up program processing, the control signals to switch the power semi-conductor of three phase PWM inverter, simultaneously use the output signal by microprocessor and extra hardware, and control signal by software. In the end, this method was proved by applying to Three Phase Voltage-type Inverter.

• 전력전자학회논문지
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• 제14권4호
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• pp.268-277
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• 2009

본 논문은 DTC-PWM을 적용한 PMSM의 속도제어 방식을 제안한다. 제안된 DTC-PWM은 기존의 DTC 방식과 PWM을 결합한 방식으로 스위칭 신호를 발생하는 구조를 가진다. 제안된 방식에서 실제 토크는 기존의 DTC 방식과 같이 추종되지만, 스위칭 신호는 토크 오차와 제어규칙에 따라 PWM 방식으로 제어한다. 토크와 자속을 제어하기 위한 스위칭 신호는 하나의 유효전압벡터와 영전압벡터로 구성되는 비대칭 스위칭 방식이 적용된다. 제안된 방식은 SVPWM과 같이 복잡한 계산없이 간단한 PWM의 연산으로 제어기를 구성하여 토크와 자속을 연속적으로 제어할 수 있다. 제안된 방식은 PMSM의 속도 제어 실험을 통하여 그 성능을 검증하였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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• pp.387-392
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• 1999

The micro electronic control technology with developing microcomputers make great contribution to electrohydraulic control systems. The electrohydraulic pulse control simplifies in conjunction with power electronic amplifier and high speed operated solenoid valves. It is necessary to valves to convert electronic pulse signal to hydraulic pulse flow as fast as possible. This study deals with the speed control of an oil hydraulic motor operated by two way high speed solenoid valves. The valves acts as converters of electronic-pulse signals to hydraulic power. By constructing systems in which a hydraulic motor is operated by two solenoid valves, the pulse with modulation method (PWM) has adopted as the speed control of hydraulic motor systems. The static and dynamic characteristics of the systems are investigated by the experiment. It is clarify that a hydraulic motor operated PWM show good performance as a control component, achieving accurate velocity control.

• 전력전자학회논문지
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• 제17권6호
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• pp.478-485
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• 2012

In this paper, a new PWM method is proposed to reduce the input current harmonics of 3 phase PWM rectifier. In the conventional carrier comparison PWM method, a triangular wave is generally used as the carrier wave. However, the large d-axis current ripple by the triangle carrier wave may be a source of large input current THD(Total Harmonic Distortion). In this paper, a new carrier comparison PWM method with saw tooth wave is proposed. Depending on the sector where the voltage command vector places, one of the rising or falling saw tooth wave is selected. To reduce the switching losses of the saw tooth carrier PWM, the discontinuous PWM is also presented. The proposed PWM method can reduce the d-axis current ripple as well as the switching losses. The performance of the conventional and proposed PWM methods is verified by the simulation and experimental results.

• 전력전자학회논문지
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• 제17권2호
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• pp.129-134
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• 2012

In this paper, a new simple PWM method for Vienna rectifier is proposed. The previous SVPWM method for Vienna rectifier is very complex and difficult to implement. To solve these problems, a new single-carrier comparison PWM method for voltage control of Vienna rectifier is proposed. Because of using the only single carrier, implementation of the proposed PWM is very simple. In the proposed PWM method, carrier comparison parts of the PWM block is only changed from the 2 level PWM control block. The usefulness of the proposed PWM method is verified by the simulation and experiment.