期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 54, 期 10, 页码 2867-2878出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2019.2930911
关键词
Charge pump; dc-dc converter; integrated cold start; ring oscillator; thermoelectric energy harvesting
资金
- National Institutes of Health [R21DE027170]
This paper demonstrates an on-chip electrical cold-start technique to achieve low-voltage and fast start-up of a boost converter for autonomous thermal energy harvesting from human body heat. An improved charge transfer through high gate-boosted switches by means of cross-coupled complementary charge pumps enables voltage multiplication of the low input voltage during cold start. The start-up voltage multiplier operates with an on-chip clock generated by an ultra-low-voltage ring oscillator. The proposed cold-start scheme implemented in a general-purpose 0.18-mu m CMOS process assists an inductive boost converter to start operation with a minimum input voltage of 57 mV in 135 ms while consuming only 90 nJ of energy from the harvesting source, without using additional sources of energy or additional off-chip components.
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