期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 51, 期 4, 页码 943-954出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2015.2503350
关键词
Asynchronous control; dc-dc converter; energy harvesting; energy scavenging; inductor sharing; reconfigurable switch-matrix
This paper presents a 10 nW-1 mu W power management IC with 3.2 nW quiescent power consumption for solar energy harvesting applications. The chip integrates a switch matrix that can be configured as a buck or a boost dc-dc converter using a single inductor as well as output voltage regulation logic, battery management block, and self-startup. The control circuit of the converter is designed in an asynchronous fashion that scales the effective switching frequency of the converter with the level of power transferred. The on-time of the converter switches adapts dynamically to the input and output voltages for peak-current control and zero-current switching. For input power of 500 nW, the proposed chip achieves an efficiency of 82%, including the control circuit overhead, while charging the energy storage device at 3 V from 0.5 V input. In buck mode, it achieves a peak efficiency of 87% and maintains efficiency greater than 80% for output power of 50 nW-1 mu W with input voltage of 3 V and output voltage of 1 V.
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