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[IEEE 2018 18th Mediterranean Microwave Symposium (MMS) - Istanbul, Turkey (2018.10.31-2018.11.2)] 2018 18th Mediterranean Microwave Symposium (MMS) - Optocoupler Effect on In-Vivo Measurements Characterization for Human Body Communication
摘要： Body Area Network (BAN) has found intuitive applications in healthcare and medical monitoring, where interconnected electronic terminals are used around a user. In this contest, Human Body Communication (HBC) is a promising technique which uses the human body as a communication medium. Almost measures targeting the HBC channel characterization, the balun has been used to separate the grounds between transceivers. In this work, optocoupler was used for the first time, to decouple transceiver ports from each other and prevent the parasitic return path. Optocoupler’s effect on the measured results was analyzed for both capacitive and galvanic HBC coupling.
关键词： capacitive coupling,body area network,galvanic coupling,balun,optocoupler,human body communication
更新于2025-09-19 17:15:36
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High-Temperature Analysis of GaN-based Blue LEDs for Future Power Electronic Applications
摘要： Commercial gallium-nitride-based blue light-emitting diodes (LEDs), primarily fabricated for lighting applications, are evaluated at high temperatures (up to 700 K) for possible integration as an optocoupler emitter in high-density power electronic modules. The temperature- and injection-current-dependent internal quantum efficiency and current-voltage characteristics of the blue LEDs are studied. The internal quantum efficiency (IQE) is extracted integrated electroluminescence (EL) intensity at different temperatures using the ABC model. The presented method helps evaluate the optimized injection current density to achieve minimum deviation in LED IQE at a broader range of operating temperatures. As per the ABC model, the LED can operate at 700 K with an IQE of 58.50% when it operates at a current density of 2A/cm2. The results show that for a temperature range of 77 – 700 K, the minimum deviation of IQE occurs when the injected current density is between 1 to 10 A/cm2. Normalized external quantum efficiency (EQE) of the device at different temperatures were also extracted using the ABC model.
关键词： quantum efficiency,high-density power module,electroluminescence,optocoupler,high-temperature optoelectronics,galvanic isolation
更新于2025-09-12 10:27:22