Prof. Chaoxing Wu Profile

Prof. Chaoxing Wu

at Fuzhou Univ

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Publications (2)

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Proceedings Article | 5 June 2024 Paper

Energy extraction from high-voltage line based on AC field coupling

Pengpeng Wang, Xinyu Chen, Wenjie Lin, Meng Yuan, Lianghe Zhang, Chaoxing Wu

Proceedings Volume 13163, 131633X (2024) https://doi.org/10.1117/12.3030264

KEYWORDS: Capacitors, Electrodes, Electric fields, Power supplies, Power grids

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Power network monitoring devices play a key role in maintaining the health and safety of power networks, so it is important to realize the sustained power supply to the monitoring devices. In this paper, a non-contact self-powered device with electrode-capacitor-electrode (ECE) structure is proposed, which can capture and store the energy of the AC electric field around the high-voltage line, so as to store the electric energy in the capacitor. It is expected to realize the continuous independent power supply to the power grid monitoring equipment. It is demonstrated that when the transmission line voltage is 7kV, the output voltage of the ECE pole plate is up to more than 600V, and 48 LEDs can be lit. For a capacitor with a capacity of 50mF, it only takes about 30 minutes to charge 15V from 5V, and can continuously output a 5 V and 50mA power for about 16 seconds. In addition, it is further found that the output voltage of the rectifier bridge increases as the parallel resistance increases, which makes it possible to effectively control the charging time by controlling the size of the resistance. The proposed self-powered device with electrode-capacitor-electrode structure provides a new energy power supply strategy for grid monitoring devices, which is expected to play an important role in enhancing the stability and reliability of power systems.

Proceedings Article | 19 December 2022 Presentation + Paper

Research on contactless electroluminescence for micro-LED epitaxial wafers based on low power plasma discharge

Yu Peng, Kun Wang, ChaoXing Wu, Yun Ye, TaiLiang Guo

Proceedings Volume 12319, 123190H (2022) https://doi.org/10.1117/12.2642301

KEYWORDS: Semiconducting wafers, Electroluminescence, Plasma, Inspection, Light emitting diodes, Cameras, Transformers, Spectroscopy, Luminescence

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A majority of electroluminescence spectroscopy inspection systems for LED epitaxial wafers are currently focused on conductive probe contact methods. However, the huge number of bead chips and the difficulty in performing point contact due to the microsize largely limit its application in the field of Micro-LED epitaxial wafers. In order to improve the efficiency of electroluminescence spectroscopy inspection of Micro-LED epitaxial wafers, this study proposed a practical method for contactless electroluminescence of Micro-LEDs, which can achieve contactless electroluminescence while ensuring the characteristics of nondestructive inspection. The basic element of the method is the generation of an induced electric potential by a conducting probe under a high frequency alternating electromagnetic field. The high frequency skin effect of the conductor causes a corona discharge arc at the tip of the probe. The electrical and optical properties of the contactless electroluminescence were analyzed by experiments. The results show that the error in the measured value of the spectral distribution is less than 2%. The system has an ultra-high dynamic inspection range, demonstrating the capability of efficient scanning and inspection.

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