微功耗深部脑刺激器刺激输出模块的设计及实现

Design and realization of micro-power stimulation output module for deep brain stimulator

刺激输出模块作为深部脑刺激器(deep brain stimulator,DBS)的核心,高效率、体积紧凑是其设计的关键,但其微功率脉冲式的输出特点,常规的设计方法不能满足应用要求,为此本文提出了基于微控制器的新颖的直流变换电路——混合模式动态脉冲式非反向升降压电路,并针对锂离子电池供电对设计参数进行了优化。实验结果显示,在整个输出范围内,模块的转换效率均保持在30%以上,在输入电源附近,效率更是可获得高达80%。该刺激输出模块设计满足了小体积、低功耗的设计要求,可应用到DBS的设计中,用于产生治疗所需的刺激脉冲。

As the kernel of Deep Brain Stimulator （DBS）, high efficiency and compact volume are the key points of the design. Featuring micro-power and pulsed output, conventional DC-DC converter topology can hardly meet the application demands. Therefore, this paper puts forward a novel DC-DC converter topology based on microcontroller, which is named as mixed-mode dynamic pulsed non-inverting buck-boost topology and optimized to operate with Liion battery. Experiment results show that the efficiency of the module is kept above 30% in the entire output range, and especially, the efficiency can reach up to 80% as the output voltage is around the input voltage. The stimulation output module features compact volume and low power consumption, and can be applied in DBS design.