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This paper presents research that uses discrete wavelet transform (DWT) and radial basis neural network for automatic classification. The flow rate of a wet-etching fabrication facility for a single wafer can be analyzed automatically. The electrical signal of a flow meter is collected and decomposed by means of DWT. The signal power of the coefficients processed by the DWT is fed into the radial...
This paper presents discrete wavelet transform (DWT) and short-time fourier transform (STFT) applications for different industrial applications. These two transforms have been compared in different fields, and their implementations are similar. The experiments and simulations show another aspect for both transforms in order to analyze the target information.
This paper presents an image processing approach that calculates the probe mark area on semiconductor wafer pads. The electrical characteristics of the chip pad must be tested using a probing needle before wire-bonding to the wafer. However, this test leaves probe marks on the pad. A large probe mark area results in poor adhesion forces at the bond ball of the pad, thus leading to undesirable products...
This paper presents an LLC series resonant high-frequency sinusoidal power supplier for contactless power transmission system utilizing the magnetizing inductance and the leakage inductance of contactless coupled transformer. The design of system's parameters is under 2mm air gap of contactless coupled transformer and utilizes microchip dsPIC30F4011 to track resonance tank voltage and current phase...
This paper presents optical design, proof-of-principle experiments, and post-signal processing for a wafer microcrack detection system. Cylindrical lens and Solid Immersion Lens (SIL) are used for the optical module. Near-field probe array is also investigated for future implementation. For post-signal processing, Probabilistic Neural Network (PNN) is used in order to identify vibration-induced deviation...
A novel high efficiency Current-Shared Photovoltaic Power System (CS-PPS), mainly constructed by the Maximum Power Point Tracking and Power Conditioning System (MPPT-PC), is proposed in this paper. The proposed MPPT-PC can track the MPPT and regulate the load energy condition at the same time for increasing the circuit efficiency and providing stable power to critical loads. A 200W prototype is designed...
A parallel LLC series resonant converter with output voltage doubler is presented in this paper. The interleaved pulse-width modulation (PWM) technique is adopted to reduce the ripple current on input and output capacitors. The capacitance of input and output capacitors can be reduced. The high current stress drawback of conventional LLC resonant converter is overcome by the proposed converter. Thus...
This paper presents design and proof-of-principle experiments for a real-time in-line wafer microcrack detection system. The line-scanning method is chosen because entire wafer can be inspected without image processing technology. Short-Time Discrete Wavelet Transform (STDWT) is developed in order to determine reflective characteristics of microcrack, and smaller computation complexity in order to...
This paper aims to explore the optimal Li-ion battery charging frequency by using AC impedance technique. The experiment proves that the optimal charging frequency is the point of the minimum AC impedance. In such a situation of the battery charged by the optimal charging frequency, the charging time and charging efficiency are improved above 30.68% and 30.6%.
A spatial scanning-probe array system for silicon-on-insulator (SOI) integrated circuit is proposed in this paper. The operating fundamentals, specifications, and simulations are presented in this paper. The proposed system is designed to scan the circuit in order to examine the surface and detect die cracks. The post signal processing by using discrete wavelet transform (DWT) for scattered optical...
This paper discusses the contactless power transmission system. The magnetic coupling model and structure required by contactless power transforming system with high efficiency are set up according to the analysis results. Then, advantages and disadvantages of various power converter models are investigated with circuits of compensation and efficiency promotion to design the best main circuit structure...
This paper presents a design and simulation for the voltage sag monitoring technique that intends to apply to multi-point measurement in a power transmission system. The purpose of this research is to fabricate a mixed-signal processing unit especially for power quality monitoring. The system modeling shows the framing discrete wavelet transform proves that the decision making for the voltage monitoring...
The proposed design for modified flip-chip LED (light emitting diode) has average coupling efficiency of 49.6% for misalignment of 0.4~3 mm. The designed ambient environment also improves the thermal efficiency by factor of 1.6.
This research presents the design and proof-of-principle experiment for an electrooptic analog-to-digital converter. An objective lens designed in order to focus the optical pulse deflected by the electrooptic deflection and bi-wedge diffraction of the near-field spatial filter array will be discussed.
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