King Kung Wu

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K. F. Yarn

Far East University

Wen Chung Chang

National Taipei University of Technology

Kai Hsing

Southern Taiwan University of Science and Technology

Long Wu

Sanming University

Ming Cheng Chure

Long Yeu Chung

Chia Nan University of Pharmacy and Science

Ping Cheng Chen

I-Shou University

Bing‐Huei Chen

Fu Jen Catholic University

Meng Jiun Wu

National Changhua University of Education

Chia Cheng Tung

Cooperative Institutions

National Cheng Kung University

Southern Taiwan University of Science and Technology

National Changhua University of Education

Far East University

National Taipei University of Technology

Chia Nan University of Pharmacy and Science

University of Parma

I-Shou University

Fu Jen Catholic University

China Medical University

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High-Quality Polysilicon Thin Film Recrystallization by Laser Annealing

Advanced materials research (2011)

King Kung Wu Wen Chung Chang

Amorphous silicon (a:Si) recrystalized to poly-silicon (poly:Si) in different gas environments by excimer laser annealing (ELA) is studied. Variations of threshold laser power for the generation of surface ablation in pure N2 gas and the mixture of N2:98% and O2:2% environments are also investigated, respectively. From experiments, it is found the combination of N2:98% and O2:2% gas can enhance the threshold laser power from 320mJ/cm2 to 390mJ/cm2 for the suppressing of surface ablation phenomenon. In the condition of average grain over 0.25um, the process window (i.e. laser power for processing ability) is 30mJ/cm2 for pure N2 only, but is 50mJ/cm2 for the combination of N2:98% and O2:2%.

Recrystallization (geology)

Laser Ablation

10.4028/www.scientific.net/amr.382.26

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Fuzzy Logic Control of Photovoltaic Lead-Acid Charging System

Advanced materials research (2011)

K. F. Yarn King Kung Wu Long Yeu Chung

A new photovoltaic solar cell charging system with fuzzy logic control is proposed and designed. This kind of solar energy storage system is composed of a solar cell, a charger, batteries, a buck converter and a digital signal processor. It mainly applies a low-voltage level translator to control the pulse charging current of a lead-acid battery and also combines the fuzzy control method to improve the charging efficiency, suppress the abnormal temperature rise in the battery, lengthen the battery life-time, reduce the additional waste, etc..Experimental and simulated results are shown to demonstrate and compare the validity of the system and verify the effectiveness with each other.

10.4028/www.scientific.net/amr.219-220.941

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Ultrasonic Welding Driver with Class-E Inverter Design

Advanced materials research (2011)

K. F. Yarn King Kung Wu Kai Hsing Wen Chung Chang

A robust circuit design using matching technology to design the ultrasonic welding transducer driver with zero voltage switching is proposed. The feedback output voltage is used to control the oscillator frequency to achieve the self-tracking function. Experimental results exhibit that the Class-E inverter circuit can be effectively and stably applied on the high power ultrasonic welding system.

Ultrasonic welding

Welding power supply

10.4028/www.scientific.net/amr.204-210.2071

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Influence of Poling Conditions on the Characteristics of PZT Ceramics

Advanced materials research (2011)

Ming Cheng Chure Ping Cheng Chen Long Wu Bing‐Huei Chen King Kung Wu

In the poling process of PZT ceramics, the poling temperature is a critical condition. When the poling temperature is too low, no matter how high is the poling field and how long is the poling time, the planar electromechanical coupling factor k p is lower. When the poling temperature is higher enough, the k p can reach to a saturated value with a lower poling field and short poling time. The variation of dielectric constant with the poling conditions is the same as that of planar electromechanical coupling factor. When poling with a low temperature, the dielectric constant after poling is lower than 1400. When poling with higher temperature, no matter how high is the poling field and how long is the poling time, the dielectric constant after poling is higher than 1500.

Poling

10.4028/www.scientific.net/amr.284-286.1375

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Citations (5)

Effect of Dimensional Size on the Electrical Voltage Generation Property of PZT Piezoelectric Ceramic

Applied Mechanics and Materials (2013)

Ming Cheng Chure Long Wu King Kung Wu Yu Chang Lin Meng Jiun Wu

In this study the relation between output voltages of PZT piezoelectric ceramic body with applied impact mechanical energy are studies. The output voltages of PZT piezoelectric ceramic body are increased with the increasing of the applied mechanical energy. Under the same impact mechanical energy, the output voltages of the PZT piezoelectric ceramic body are depending on both the dimensional size and properties of the samples. The PZT piezoelectric ceramic body with greater (t/D 2 ) can produce a higher output voltage. With the same piezoelectric ceramic body size, under the same impact mechanical energy, the output voltage of soft type piezoelectric ceramic body is higher than that of hard type piezoelectric ceramic body, which is because the g 33 value of soft type piezoelectric ceramic body is higher than that of hard type piezoelectric ceramic body.

10.4028/www.scientific.net/amm.377.166

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Citations (1)

Automatic Frequency-Tracking Control for Ultrasound Welding System

Advanced materials research (2011)

K. F. Yarn King Kung Wu Kai Hsing Wen Chung Chang

A new frequency-tracking control method to catch the optimal working frequency for the high power ultrasonic welding system is proposed. In a high power ultrasonic resonant system, the induced high temperature will change the working frequency. Therefore, the proposed control method to track the optimal working frequency becomes very attractive and important. This control method is practically implemented by a FPGA chip which basically includes two logic circuits. One logic circuit is to find the optimal working frequency automatically and the other one is to adjust the working frequency by detecting the working current simultaneously. Experimental results exhibit the new method can effectively control and track frequency for high power ultrasonic welding system.

Ultrasonic welding

Tracking (education)

Control logic

10.4028/www.scientific.net/amr.204-210.2041

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Citations (1)

Computer Graphic Control on the Battery Monitoring System

Advanced materials research (2011)

K. F. Yarn King Kung Wu Wenbin Lin

In this study, the MITSUBISHI PLC (FX2n-32MR) is used to achieve the lead-acid battery monitoring system. The battery is by way of rater and FX-2AD used in charging state. The analog and digital data are transmitted to PLC to get the real-time monitoring and control. During charging, time and voltage keep constant to reach charging optimization condition. In addition, AD590 is used as reference measurement and battery protection in temperature control.

10.4028/www.scientific.net/amr.219-220.832

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