Bidirectional Single-Inductor Dual-Supply Converter with Automatic State-Transition for IoT Applications

Hung Hsien Wu, Chi Hsiang Huang, Chia Ling Wei, Jih Sheng Lai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A single-inductor dual-supply dc-dc converter with bidirectional energy flow is proposed for the Internet-of-Things applications. This paper combines two dc-dc converters into one by sharing a single inductor, and it is capable of storing energy and powering output load by using the bidirectional inductor current. Besides, the voltage of the energy storage element is continuously monitored in the proposed converter, which eliminates the possibility of overcharging. Furthermore, the variations on the output voltage are typically negligible when the input voltage changes. In addition, a novel two-step startup procedure that does not require any on-chip/off-chip startup auxiliary circuit is proposed, which can significantly reduce the chip area. The proposed converter is fabricated by a 0.18-μm CMOS mixed-signal process. The voltage range of the storing element is 1.2-1.4 V, and the maximal output power of the proposed converter is 18 mW with its output voltage setting at 1.8 V.

Original languageEnglish
Article number8719960
Pages (from-to)4068-4078
Number of pages11
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume66
Issue number10
DOIs
Publication statusPublished - 2019 Oct

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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