The Design of Bluetooth Communication System between a Battery-less Implanted Sensor and an Android Phone using a Wireless Power Transfer System
Open AccessIn this thesis, a microcontroller unit (MCU) is carefully chosen after a comparison for the highest power efficiency and sampling frequency. This MCU can be implemented inside the human body with any sensors. Also, a firmware for the MCU and an Android app are developed so that the implemented MCU and an Android phone can exchange data via Bluetooth. In this thesis, the MCU operates without a battery making it smaller and safer to use inside the human body. The two wireless power transfer (WPT) methods, the ultrasonic and inductive WPT, are considered in this thesis. The ultrasonic WPT is not practical enough yet and still requires more research, but the inductive WPT is very well commercialized due to its high and reliable power transfer through a thin medium. In this thesis, a portable ultrasonic WPT system is simulated and demonstrated which produces 2.25Vpp sine wave and 0.157mW through an 8mm water medium using 320 kHz PZT transducers. Also, a portable 450 kHz inductive WPT system is simulated and demonstrated which produces 32.8mW power at 12.3% power transfer efficiency (PTE) on the receiver side. This inductive WPT system is simulated to produce up to 78% PTE at 6 MHz, although it produces the highest power, 32.8mW, at 450 kHz on the receiver side. This inductive WPT system is used to power up the MCU successfully at a 3 mm distance even without any extra voltage regulator. It is demonstrated that the MCU fully functions with this WPT system making it possible to be used as an implementable device that communicates with an Android phone.
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