A Wireless Power Design with High PCE and Fast Transient Response over a Large Loading Range for Multi-channel Neural Stimulators

2022 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS) Pub Date : 2022-11-11 DOI:10.1109/APCCAS55924.2022.10090269

Weisong Liang, Xu Liu, Weijian Chen, Ze-Xi Lu, Peiyuan Wan, Zhijie Chen

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Abstract

Brain-machine interface(BMI) with implantable bioelectronics systems can provide an alternative way to cure neural diseases, while a wireless power transfer (WPT) system plays an important role in providing a stable voltage supply for the implanted chip. A WPT for multichannel neural stimulators with high power conversion efficiency(PCE) and low power dissipation over a large loading range is proposed in this work. Both the internal Vth cancelation (IVC) and the dynamic bulk modulation (DBM) schemes are used to maximize the PCE of rectifiers. Besides, a reverse nested miller compensation (RNMC) LDO with a transient enhancer is proposed for the WPT system. Simulation results show that the total PCE is 55% at its peak, and the power consumption is 0.55 mW and 22.5 mW at standby (SB) and full stimulation (ST) load, respectively. For a full load transition, the overshoot and downshoot of the LDO are 110mV and 71 mV, respectively, which help improve the load transient response during neural stimulation.

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多通道神经刺激器大负载范围内高PCE、快速瞬态响应的无线电源设计

植入生物电子系统的脑机接口(BMI)可以为神经疾病的治疗提供另一种方法，而无线电力传输(WPT)系统在为植入芯片提供稳定的电压供应方面发挥着重要作用。提出了一种在大负载范围内具有高功率转换效率(PCE)和低功耗的多通道神经刺激器WPT。采用内部Vth对消(IVC)和动态块调制(DBM)两种方案来最大限度地提高整流器的PCE。此外，针对WPT系统，提出了一种带暂态增强器的反向嵌套米勒补偿LDO。仿真结果表明，在待机(SB)和全激励(ST)负载下，峰值时总PCE为55%，功耗分别为0.55 mW和22.5 mW。在全负荷过渡时，LDO的过调值为110mV，下调值为71 mV，有助于改善神经刺激时的负荷瞬态响应。

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2022 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

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