用于神经刺激器的单电感双极性直流电压转换器  

A Single-Inductor Bipolar-Output DC-DC Converter for Neural Stimulator

作　　者：孙雷 张育维 张沕琳 李冬梅[1] SUN Lei;ZHANG Yuwei;ZHANG Milin;LI Dongmei(Department of Electronic Engineering,Tsinghua University,Beijing 100084,P.R.China)

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《微电子学》2021年第1期16-21,共6页Microelectronics

基　　金：国家自然科学基金资助项目(61674095)。

摘　　要：提出了一种应用于神经电刺激器的单电感双极性输出(SIBO)的直流电压转换器,具有良好的轻载效率和较低的设计复杂度。提出的SIBO系统只使用一个电感,通过两相控制同时输出正负电压,降低了控制复杂度,减少了开关通断次数,提高了效率。同时使用数模混合电路、固定导通时间调制方式实现逻辑控制,提高了系统效率,降低了设计复杂度。SIBO系统采用单节锂电池供电,输入电压为3 V到4.2 V,输出电压在不同模式下可以分别输出 ±16 V、±12 V、±8 V、±4 V。后仿真结果表明,SIBO系统在输出电压为±16 V、负载电流为1 mA时,V_(OP)、V_(ON)的纹波分别为4.5 mV和3.4 mV;在负载电流为1.3 mA时,能够达到的最大效率为94.8%。具有效率高、纹波小、复杂度低等优势。A single-inductor bipolar-output(SIBO) DC-DC converter was designed for the application of neural stimulation was proposed, featuring with high light-load efficiency and low design complexity. The proposed SIBO system generated both positive and negative voltages in the same time by using only one inductor and two-phase control rhythm, which greatly reduced the complexity of the control logic, and improved the efficiency. Constant on-time(COT) control was applied to improve light-load efficiency. The proposed SIBO system was powered by a single-cell lithium battery with an input voltage range of 3 V to 4.2 V. The output voltage of ±16 V, ±12 V, ±8 V, or ±4 V were enabled in different modes. Output voltage ripples of 4.5 mV of V_(OP) and 3.4 mV of V_(ON) were achieved with a ±16 V output voltage and a 1 mA load current according to post simulation. A maximum power efficiency of 94.8% was achieved with a 1.3 mA load current. The circuit featured high efficiency, small output voltage ripple and low design complexity.

关 键 词：单电感 双极性输出 直流电压转换器 神经电刺激器 

分 类 号：TN86[电子电信—信息与通信工程]