• 전기학회논문지P
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• 제60권4호
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• pp.227-235
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• 2011

This paper describes a PMSM control algorithm for realizing a low-cost motor drive system using a general purpose microcontroller. The proposed sensorless algorithm consists of the current observer and the sensorless scheme based on instantaneous reactive power. Also the control board system is not the high-cost DSP(digital signal processor) system but the general purpose microcontroller and it allows to reduce the unit cost of the motor system. However the clock frequency of the proposed microcontroller is one-fifths for the clock frequency of the DSP. In addition, the switching frequency must be selected as the lower frequency because of complex mathematic modeling of the sensorless algorithm. the low switching frequency augments the noise of the motor and might make accurate speed control impossible. Thus this paper proposes the optimization method to supplement the drawback of the general purpose microcontroller and the usefulness of the proposed method is verified through the experiment.

• 한국산업정보학회논문지
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• 제27권6호
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• pp.51-58
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• 2022

마이크로 컨트로러(MCU)는 Advanced Microcontroller Bus Architecture (AMBA)에 다양한 모듈을 연결시켜 프로그래밍을 통해 각 모듈들을 적절히 활용하도록 설계되어있다. 범용 MCU는 많이 사용되는 모듈들을 미리 설계 및 제작하여 소비자가 적절히 사용하도록 제작되어 판매되고 있다. 하지만, 특정 산업군에서는 MCU를 직접 설계하여 분야에 적합한 모듈 종류 및 수량을 사용자가 희망하는대로 설계하여 활용할 필요가 있다. 하지만, 대부분의 소비자는 MCU를 직접 설계하기에는 상당한 진입장벽이 있다. 본 연구에서는 MCU 교육 및 연구단계에서 손쉽게 MCU를 설계할 수 있는 개발 가이드라인을 제공한다. 먼저, AMBA를 활용하기위해 요구되는 필수 모듈을 소개하고, 해당 모듈이 AMBA 및 인터럽트 동작을 통해 제대로 동작하는지 검증하고, 최종적으로는 온칩으로 설계하여 사용될 수 있도록 방법론을 제공한다.

• 센서학회지
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• 제23권1호
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• pp.24-28
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• 2014

A lock-in amplifier was proposed for capacitive sensor applications. This amplifier was based on a general-purpose microcontroller and had only a charge amplifier as analog circuits. All the other functions of lock-in amplifier except for the charge amplifier were implemented with firmware and the internal resources of the microcontroller. A rectangular signal, generated by the microcontroller, was used in a sensor-driving signal instead of a conventional sinusoidal signal. This makes it possible that the phase comparison circuit in the lockin amplifier is made with analog-to-digital converter, a timer and an interrupt controller. Using the oversampling method and the rectangular driving signal, we can make it easy to implement the peak detection function with software and sample the peak-to-peak signal at charge amplifier output. A charge amplifier was proposed to cancel out the base capacitance existing in capacitive sensors structurally. The experimental results show that the lock-in amplifier operating in the supply voltage of 3.0 V cancels out the base capacitance and has good linearity.

• 반도체디스플레이기술학회지
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• 제16권4호
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• pp.63-67
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• 2017

In this study, We developed a simple and low cost capacitive pressure mapping sensor and microcontroller-base lock-in amplifier array. We developed capacitive type pressure mapping sensor by forming the electrode and adhesives on plastic films using only the printing process, and the finishing the process by bonding the two films. Lock-in amplifier array was based on a general purpose microcontroller and had only a charge amplifier as analog circuits. In this study, a $10{\times}10$ capacitive type pressure mapping sensor and lock-in amplifier array was fabricated and its characteristics were analyzed.

• Journal of Power Electronics
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• 제10권4호
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• pp.434-443
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• 2010

A general purpose experimental set-up has been designed and implemented for students to carry out various experiments on inverters in the power electronics laboratories of universities, during a few hours of laboratory work. This is the first inverter setup that incorporates hardware and software control, as well as an optional user interface in a laboratory experimental set-up of a single multi-purpose inverter, thus making the system versatile and very practical for both undergraduate and graduate students. The system can be controlled either by a computer or through a liquid crystal display (LCD) and a keypad control unit, and it constitutes a low-cost alternative to relatively expensive commercial teaching sets. The computer provides a user friendly interface and easier control for laboratory environments equipped with computers. The LCD and keypad units eliminate the need for a computer, which makes this system usable in the laboratory as a standalone unit as well.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(2)
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• pp.317-320
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• 2002

Recently, AMBA(Advanced Microcontroller Bus Architecture) is used as common system bus at embedded system. In this paper, we described test method of peripheral device which is connected to AMBA according to the bus interface defined by AMBA protocol We implemented one of the APB(Advanced Peripheral Bus) peipheral module, GPIO(General Purpose Input/output), and tested its functionality as il is connected to the AMBA system.

• 한국정보통신학회논문지
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• 제25권1호
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• pp.96-101
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• 2021

아두이노는 오픈 소스 마이크로컨트롤러 프로젝트 중 하나로 AVR 마이크로컨트롤러를 사용한 아두이노 보드가 흔히 사용된다. AVR 마이크로컨트롤러에서는 일반적으로 ISP(In System Programming) 방식 업로드를 사용하지만, 아두이노에서는 부트로더를 통한 시리얼 방식 업로드를 기본으로 하며 이를 위해 전용 마이크로컨트롤러를 보드에 내장하고 있다. 아두이노에서 ISP 방식 업로드를 사용하기 위해서는 별도의 전용 업로드 장치가 필요하지만, 아두이노 보드에는 포함되어 있지 않다. 이 논문에서는 ISP 방식 업로드와 시리얼 방식 업로드를 하나의 전용 마이크로컨트 롤러를 통해 처리할 수 있는 통합 프로그래머를 제안하고, 통합 프로그래머를 사용하여 ISP 방식과 시리얼 방식 업로드가 가능함을 보인다. 이외에도 제안하는 통합 프로그래머는 USB-시리얼 변환장치로 동작하여 컴퓨터와의 시리얼 통신을 지원하며 아두이노의 부트로더를 굽는 것도 가능하다. 통합 프로그래머의 모든 동작은 실험 결과를 통해 확인할 수 있다.

• 대한의용생체공학회:의공학회지
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• 제17권1호
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• pp.129-138
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• 1996

This paper describes design techniques of general purpose thermal array printer, especially easily applicable to medical measurement equipment. The'general'means that the proposed thermal array printer can be applied to not only medical field but other industrial field by establishing the eligible protocol. The thermal array printer is composed of i)MPU and its peripherals ii)printer head control, iii)diverse protection circuits, and iv)serial communication. In this paper the performance of the proposed thermal array printer was evaluated by applying to an 3 channel electrocardiogram recorder. The propped system can support'Hangul'text as well as alphanumeric characters and any bitmap image.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.225-227
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• 2008

This paper deals with the implementation on a Field Programmable Gate Array (FPGA) of PWM switching patterns for a voltage multilevel inverter. The reference data in main microcontroller is transmitted to the FPGA through 16 general purpose I/O ports. Herein, three-phase reference voltage signals are addressed by the last 2-bit (bit 15-14) and their data are assigned in remaining 14-bit, respectively. The carrier signals are created by 16-bit counter in up-down counting mode inside FPGA according to desirable topology. Each reference signal is compared with all carrier signals to generate corresponding PWM switching patterns for control of the multilevel inverter. Useful advantages of this scheme are easy implementation, simple software control and flexibility in adaptation to produce many PWM signals. Some simulations and experiments are carried out to validate the proposed method.

• International journal of advanced smart convergence
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• 제6권1호
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• pp.76-81
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• 2017

This paper presents a low cost and flexible IoT enabled smart LED controller using Arduino that is used for emergency exit signs. The Internet of Things (IoT) is become a global network that put together physical objects using network communications for the purpose of inter-communication of devices, access information on internet, interaction with users as well as permanent connected environment. A crucial point in this paper, is underlined on the potential key points of applying the Arduino platform as low cost, easy to use microcontroller with combination of various sensors applied in IoT technology to facilitate and establishment of intelligent products. To demonstrate the feasibility and effectiveness of the system, devices such as LED strip, combination of various sensors, Arduino, power plug and ZigBee module have been integrated to setup smart emergency exit sign system. The general concept of the proposed system design discussed in this paper is all about the combination of various sensor such as smoke detector sensor, humidity, temperature sensor, glass break sensors as well as camera sensor that are connected to the main controller (Arduino) for the purpose of communicating with LED exit signs displayer and dedicated PC monitors from integrated system monitoring (controller room) through gateway devices using Zig bee module. A critical appraisal of the approach in the area concludes the paper.