| Summary: | 碩士 === 淡江大學 === 電機工程學系碩士在職專班 === 106 === Internet of Things, Industry 4.0, access control systems, and modern intelligent office equipment have become important infrastructures for smart cities, and the PoE technology can transmit power and data to the device by Ethernet cable.
In this thesis, we use the four pairs of Ethernet routes, and then through the self definition of PoE communication, re-design the PSE and the PD board, which can overcome the limitation of IEEE802.3af /at specification from 30 watt to 90 watt. The power supply on the Ethernet network is changed from two pairs to four pairs, which can greatly reduce the power consumption by 100 meters Ethernet cable. In addition, using the MOSFET to replace the Diode bridge rectifier can improve the overall efficiency, and solve the problem of thermal dissipation at the same time. Finally, re-design the fly-back circuit to synchronous rectification, and provide the power to end device.
Currently, the power supply standards of various companies are not uniform. Although USB can be applied to most mobile devices or wearable systems, but it is still not enough for many industrial systems. Therefore, this research can be applied to the Digital Signage in Retail or department store, which can simplify the complexity and decrease cost of connection. Moreover, the heat problem also can be solved in 24-hour operation of system.
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