An ultra-low quiescent current power management ASIC with MPPT for vibrational energy harvesting
An ultra-low quiescent current power management ASIC with MPPT for vibrational energy harvesting
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具有 MPPT 功能的超低静态电流电源管理 ASIC，用于振动能量收集
DOI：
10.1109/iscas.2017.8050865
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
P. Feng
中科院分区：
文献类型：
--
作者：
Shiquan Fan;Liuming Zhao;Ran Wei;Li Geng;P. Feng
提出了一种用于自供电无线传感器节点中与压电(PZE)能量采集器接口的超低静态电流电源管理集成电路(IC)。PZE收割机首先将机械能从振动转化为电能。然后使用全桥整流器将PZE的交流输出转换为直流电，并为一个小的滤波电容器充电。利用阻抗匹配负载实现最大功率点跟踪(MPPT)，通过高效率的Buck-Boost转换器将能量进一步传输到超级电容器。低压差(LDO)稳压器用超级电容器中存储的能量为片上CMOS传感器和外部射频发射器供电，提供清洁的电源，形成一个完整的无线温度传感器节点，可以实现物联网(IoT)传感器网络。该电路采用0.5μm标准cmos工艺流片。测量结果证实了这一设计的所有关键特点：(1)整流电路的电压转换效率高达96%；(2)采用阻抗匹配方法，在0 V至3.3 V的范围内，对1 mF的降压-升压转换器超级电容器进行充电所需的最少S充电时间；(3)0 nA至100 mA的负载电流范围以及至少85°相位裕度(PM)LDO稳压器，其超低静态电流低至750 pA。
We present an ultra-low quiescent current power management integrated circuit (IC) for interfacing with a piezoelectric (PZE) energy harvester in a self-powering wireless sensor node. The PZE harvester first transforms mechanical energy from vibration into electricity. The AC output from the PZE is then converted into DC power using a full bridge rectifier, and charges a small filter capacitor. The energy is further transferred into a supercapacitor by a Buck-Boost converter with high efficiency, using an impedance matching load to achieve maximum power point tracking (MPPT). A low-dropout (LDO) regulator powers the on-chip CMOS sensor and an external RF transmitter with the energy stored in the super capacitor, providing clean power supply, forming a complete wireless temperature sensor node, which can enable Internet-of-Things (IoT) sensor networks. The circuit is taped out using a 0.5 μm standard CMOS process. Measurements confirm all key features of this design: (i) up to 96% voltage converting efficiency of the rectifier; (ii) a minimum of 102 s charging time to charge a 1 mF supercapacitor from 0 V to 3.3 V of the Buck-Boost converter with impedance matching method; (iii) a 0 nA to 100 μA load current range and at least 85° phase margin (PM) LDO regulator with an ultra-low quiescent current as low as 750 pA.