Wireless Power Transfer and Data Communication for Intracranial Neural Recording Applications by Kerim Türe & Catherine Dehollain & Franco Maloberti

Author:Kerim Türe & Catherine Dehollain & Franco Maloberti
Language: eng
Format: epub
ISBN: 9783030408268
Publisher: Springer International Publishing

The micrograph of the fabricated regulator is shown in Fig. 3.19. An efficiency of 78% is measured for 10 mW regulated output when the unregulated input is 2 V and load capacitance is 100 nF.

Fig. 3.19Micrograph of the LDO regulator

3.4.4 Automatic Resonance Tuning

The power transfer efficiency through magnetically coupled coils is maximized when the coils resonate at precisely the same frequency. However, this resonance frequency is highly sensitive to the process variations and requires a significant amount of effort for manual trimming in order to reach the same frequency. Even worst case, manual trimming of the resonant circuit cannot be a solution for the shift in the resonance frequency caused by packaging and the nearby tissue effects in implanted biomedical applications. The frequency of the external base station can be fixed to a specific value, but there is no more control over the implanted system. Therefore, there is a need for an automatic resonance tuning mechanism that maximizes the received power. Figure 3.20 shows the developed system inspired by the work presented in [33], which controls the bank of capacitors to maximize the received regulated voltage for a constant load.

Fig. 3.20Proposed structure for automatic resonance tuning for an inductively coupled remote powering system

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