An Energy-Efficient High-Frequency Neuro-Stimulator with Parallel Pulse Generators, Staggered Output and Extended Average Current Range

2018 IEEE International Symposium on Circuits and Systems (ISCAS) Pub Date : 2018-05-27 DOI:10.1109/ISCAS.2018.8350980

Guijie Zhu, Songping Mai, Xian Tang, Chun Zhang, Zhihua Wang, Hong Chen

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Abstract

This paper presents a high-frequency pulse stimulation (HFPS) output stage of neuro-stimulator with extended average output current range and high power efficiency. The output stage features two parallel buck-boost converters without any filter capacitor at the output node. Compared with HFPS output stage with only one converter, the proposed circuit doubles the maximum average current by staggering the output of two converters. Compared with traditional voltage mode stimulation (VMS), HFPS improves the power efficiency by discharging the inductor current through the tissue load directly, rather than through a filter capacitor with constant voltage. Besides, the control circuit for the proposed HFPS is much simpler than that of traditional VMS converter, which reduces the current consumption significantly and thus improves the efficiency. Test results confirm that with staggered output of two parallel converters, the maximum average current is doubled. The maximum energy efficiency of the proposed HFPS is 76.4%.

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具有并联脉冲发生器、交错输出和扩展平均电流范围的高能效高频神经刺激器

提出了一种平均输出电流范围大、功率效率高的神经刺激器高频脉冲刺激输出级。输出级具有两个并联的降压-升压转换器，在输出节点没有任何滤波电容器。与只有一个变换器的HFPS输出级相比，该电路通过错开两个变换器的输出，使最大平均电流增加了一倍。与传统的电压模式刺激(VMS)相比，HFPS通过直接通过组织负载释放电感电流而不是通过恒压滤波电容器来提高功率效率。此外，该HFPS的控制电路比传统的VMS变换器简单得多，大大降低了电流消耗，从而提高了效率。测试结果证实，当两个并联变换器错开输出时，最大平均电流增加一倍。所提出的HFPS的最大能源效率为76.4%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 IEEE International Symposium on Circuits and Systems (ISCAS)

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