The Development Of Capacitive Power Transfer For Biomedical Implantable Device

Ahmad, Nur Fatin Afiqah (2018) The Development Of Capacitive Power Transfer For Biomedical Implantable Device. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Wireless power transfer using electric and magnetic near-fields has been used in many applications widely, and biomedical implants being one of them. The most commonly used method for powering power wirelessly to biomedical implantable device is using inductive coupling between two mutually-coupled coils. In this project, a consider new method will be proposed in transferring power for biomedical device which is capacitive power transfer (CPT). The simplicity in its design compared to inductive coupling make it more convenient to be used in biomedical implantable device. The main reasons of using this method are the low electromagnetic interference (EMI), can reduce power losses and the abilities to transfer power across metal barriers compared to the traditional method of inductive power transfer. To be specific, in this project, we have designed Class E circuit as an inverter to convert the 12VDC to AC with 1 MHz frequency. The prototype of the capacitive power transfer for implantable application has also been successfully developed with capacitive plate dimensions of 3cmx3cm width per length for receiver plate and 4cmx4cm for transmitter plate, respectively. The 5mm thickness of beef separation between the plates is used in this project. The design specification of this project is according to stimulator for peripheral nerve implantable device which only needs 100 mW of power to operate in the CPT system. Overall, the developed CPT system for the biomedical device is able to deliver 76mWatt with 41.43% efficiency. To enhance the efficiency, the impedance matching circuit has been proposed in this project and the prototype is now able to deliver 140mWatt power to the DC load, achieving ZVS waveform and efficiency of 77.5%.

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