一种具有无线充电和动态电压输出的节能型植入式神经刺激器系统。
An Energy-Efficient Implantable-Neural-Stimulator System with Wireless Charging and Dynamic Voltage Output.
作者信息
Fu Xingyu, Mai Songping, Wang Zhihua
出版信息
Annu Int Conf IEEE Eng Med Biol Soc. 2019 Jul;2019:3835-3839. doi: 10.1109/EMBC.2019.8856818.
Neural stimulators have become more and more widely used as an effective tool in neural therapies. To address power supply and consumption issues in this application, an energy-efficient Implantable-Neural-Stimulator system composed of a pulse generator and a wireless charger is proposed and implemented in 0.8μm 40V Bipolar-CMOS-DMOS (BCD) process. By adopting a Single Ended Primary Inductor Converter (SEPIC) and optimizing the switching frequency and the gate width of its power MOSFET, the stimulating output voltage range can cover 0~12V with a maximum output ripple of 0.31%. The proposed charger can charge the implantable battery wirelessly by an inductively coupled resonance circuit. In addition, it can adjust the charging voltage to keep it constantly only a little higher than the battery voltage, which reduces the charging headroom voltage and greatly improves the charging efficiency. The measured maximum power efficiencies of these two modules reach as high as 78.04% and 70.67%, respectively.
神经刺激器作为神经治疗中的一种有效工具，其应用越来越广泛。为了解决该应用中的电源和功耗问题，本文提出并采用0.8μm 40V双极互补金属氧化物半导体-双扩散金属氧化物半导体（BCD）工艺实现了一种由脉冲发生器和无线充电器组成的高能效植入式神经刺激器系统。通过采用单端初级电感变换器（SEPIC）并优化其功率MOSFET的开关频率和栅极宽度，刺激输出电压范围可覆盖0~12V，最大输出纹波为0.31%。所提出的充电器可通过电感耦合谐振电路对植入式电池进行无线充电。此外，它可以调节充电电压，使其仅比电池电压略高并保持恒定，从而降低充电净空电压并大大提高充电效率。这两个模块测得的最大功率效率分别高达78.04%和70.67%。
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