• Proceedings of the KIEE Conference
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• 1998.07f
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• pp.1999-2001
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• 1998

A speed controller of a induction motor using Microcontroller and Fuzzy logic is presented in the paper. Generally, fuzzy logic controller is known as a controller which can be coped with a non-linear and a complex system. A fuzzy logic is used for robust and fast speed control and space vector modulation method is used for PWM wave generation in this proposed system. The results of experiment show excellence of the proposed system and that the proposed system is appropriate to control the speed of a induction motor for industrial application.

• Journal of Electrical Engineering and Technology
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• v.7 no.5
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• pp.724-729
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• 2012

A fuzzy PID controller design method is proposed for precise robust control of DC-DC buck converters. The PID parameters are determined reflecting on the common control engineering knowledge that transient performances can be improved if the P and I gains are big and the D gain is small at the beginning. Different from the previous fuzzy control design methods, the proposed method requires no defuzzification module and the global stability of the proposed fuzzy control system can be guaranteed. The proposed fuzzy PID controller is implemented by using a low-cost 8-bit microcontroller, and simulation and experimental results are given to demonstrate the effectiveness of the proposed method.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.10 no.6
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• pp.81-87
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• 1996

This paper is to develop a digital inverter using microcontroller for a Switched Reluctance Motor (SRM) driver. The closed-loop speed control system with fixed switching angle and variable voltage control is used to from a flat-topped phaes current and to simplfiy the drive system. This could be driven in a wide speed range with flat-topped current. Mifcrocontroller os used to be compact and to have a flexbility in the control system.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.1265-1268
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• 1996

This paper describes a new pulse width modulation (PWM) scheme suitable for microprocessor-based PWM inverters. Optimal switching patterns minimizing the performance index corresponding to the distortion factor are decided in real time by numerical calculation using the microprocessor-implemented control system. This PWM method is compared with conventional methods, such as the natural PWM and the direct PWM. Harmonic analysis using digital simulations shows that the proposed PWM scheme has much less low-order harmonics than the other methods. The validity of this method is verified in experiments using a microprocessor-based control system, where a 16-bit single-chip microcontroller, Intel 80c196kc is used.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.468-471
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• 2005

The Air Quality Sensor(AQS), located near the fresh air inlet, serves to reduce the amount of pollution entering the vehicle cabin through the HVAC(heating, ventilating, and air conditioning) system by sending a signal to close the fresh air inlet door/ventilation flap when the vehicle enters a high pollution area. One chip sensor module which include above two sensing elements, humidity sensor and bad odor sensor was developed for AQS (air quality sensor) in automobile. With this sensor module, PIC microcontroller was designed with back propagation neural network to reduce detecting error when the motor vehicles pass through the dense fog area. The signal from neural network was modified to control the inlet of automobile and display the result or alarm the situation. One chip microcontroller, Atmega128L (ATmega Ltd., USA) was used. For the control and display. And our developed system can intelligently detect the bad odor when the motor vehicles pass through the polluted air zone such as cattle farm.

• Journal of information and communication convergence engineering
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• v.7 no.4
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• pp.561-564
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• 2009

A cryptographic dongle, which is capable of transmitting encrypted voice signals over the CDMA/GSM voice channel, was designed and implemented. The dongle used PIC microcontroller for signals processing including analog to digital conversion and digital to analog conversion, encryption and communicating with the smart phone. A smart phone was used to provide power to the dongle as well as passing the encrypted speech to the smart phone which then transmits the signal to the network. A number of tests were conducted to check the efficiency of the dongle, the firmware programming, the encryption algorithms, and the secret key management system, the interface between the smart phone and the dongle and the noise level.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.51 no.4
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• pp.180-186
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• 2002

This paper describes on the development of power detection system with one-chip microcontroller. The designed system is composed of power detection circuits and analyzing software. The system detects, 3-phases voltage, 3-phases current, external temperature, leakage current and stores in flash memory. AT89C52 was used as CPU and AM29F040B was used as memory to store the data. The analysis saftware was developed to detect the cause of the electrical fire incidents. With a data-compression technology, the data can be stored for the 43.5 days in a normal state, four hours and fifteen minutes in emergency state.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.10
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• pp.94-101
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• 2004

This paper presents the development of a keypad test system for the improvement of working environment and productivity using PTC 16F877 microprocessor. In order to detect the fault of keypad products, hardware and software design is performed in this system. Keypad fault detection system is controlled by the 8 bit one chip PIC microcontroller for the exactness and speed. Developed panel of the keypad test system is comprised of the sub-panel for selecting in the inspected keypad types and the main panel f3r displaying the working order and fault position. Furthermore, all data from keypad inspection are stored in main memory of personal computer for the database. All these functions lead to the improvement of working speed and environment.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10a
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• pp.287-291
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• 1992

Recently, electronic engine control system is used in many automotives for high efficiency and low pollution. In order to perform these requirements, fuel injection control, spark timing control, knock control, exhaust gas recirculation control and idle speed control should be implemented. In this paper, idle speed control system using microcontroller is developed, which is compact in hardware, but powerful in software performing efficient control and various compensations for engine condition and environments. If idle speed is low engine operation is not smooth, reversely if high, fuel consumption is increased. Therefore idle speed must be maintained as low as possible within the scope that ensures smooth operation of engine. Also, an engine signal simulator, which generates various signals from engine, is realized for test facility.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.585-588
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• 2002

In this paper, the current controlled active poler filter(APF) with the performance of reducing harmonic and improving power factor is studied. It has high speed and good performance with low cost. The current controlled shunt APF is proposed, and the control part of APF is designed of SOC(System On Chip). So this system has low expense and good performance. In this study, the micro-controller which designed with VHDL. is applied to APF system. And the proposed technique in this paper demonstrates the excellent of the dedicated micro-controller. VHDL-based ASIC can simplify the process of development and has a competition in market because it reduces the consuming time for the design of IC(Integrated Circuit) in system level.