Fully-Integrated Reconfigurable Charge Pump With Two-Dimensional Frequency Modulation for Self-Powered Internet-of-Things Applications
Fully-Integrated Reconfigurable Charge Pump With Two-Dimensional Frequency Modulation for Self-Powered Internet-of-Things Applications
复制标题
适用于自供电物联网应用的具有二维调频功能的全集成可重构电荷泵
DOI：
10.1109/tcsi.2020.3012504
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Po
中科院分区：
文献类型：
--
作者：
Hao;W. Tsai;Po;Po
在本文中，我们提出了一种采用 0.18-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> CMOS 工艺的完全集成可重构电荷泵；该转换器适用于自供电物联网应用。所提出的电荷泵采用二维频率调制技术，该技术结合了脉冲频率调制（PFM）和脉冲跳跃调制（PSM）技术。 PFM技术根据负载电流的变化调整转换器的工作频率，PSM技术调节输出电压。所提出的二维频率调制技术可以提高轻负载条件下的整体功率转换效率和转换器的响应时间。选择光伏电池作为所提出的转换器的输入源。为了适应不同光照强度下光伏电池输出电压的变化，我们构建了一个可重构转换器核心，当输入电压范围为0.53 V至0.7 V时，可实现1.2 V的稳压输出电压，具有2、2.5和3多种功率转换比。我们的测量结果证明，所提出的电容式功率转换器可以实现80.8%的峰值功率转换效率，并且效率超过70%负载电流范围为 <inline-formula> <tex-math notation="LaTeX">$10~\mu \text{A}$ </tex-math></inline-formula> 到 <inline-formula> <tex-math notation="LaTeX">$620~\mu \text{A}$ </tex-math></inline-formula>。
In this paper, we propose a fully-integrated reconfigurable charge pump in a 0.18-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> CMOS process; this converter is applicable for self-powered Internet-of-Things applications. The proposed charge pump uses a two-dimensional frequency modulation technique, which combines both the pulse-frequency modulation (PFM) and pulse-skip modulation (PSM) techniques. The PFM technique adjusts the operating frequency of the converter according to the variations in the load current, and the PSM technique regulates the output voltage. The proposed two-dimensional frequency modulation technique can improve the overall power conversion efficiency and the response time of the converter under light load conditions. A photovoltaic cell was chosen as the input source of the proposed converter. To adapt to the variations in the output voltage of a photovoltaic cell under different light illumination intensities, we built a reconfigurable converter core with multiple power conversion ratios of 2, 2.5, and 3 for the regulated output voltage of 1.2 V when the input voltage ranged from 0.53 V to 0.7 V. Our measurement results prove that the proposed capacitive power converter could achieve a peak power conversion efficiency of 80.8%, and the efficiency was more than 70% for the load current that ranged from <inline-formula> <tex-math notation="LaTeX">$10~\mu \text{A}$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$620~\mu \text{A}$ </tex-math></inline-formula>.