Dual-Source Energy-Harvesting Interface with Cycle-by-Cycle Source Tracking and Adaptive Peak-Inductor-Current Control

Chi Wei Liu, Hui Hsuan Lee, Pei Chun Liao, Yi Lun Chen, Ming Jie Chung, Po-Hung Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


In this paper, we present a single-inductor triple-input-triple-output (SITITO) buck-boost converter in a 0.18-$\mu\text{m}$ CMOS process for dual-source energy harvesting. The converter operates in the single-source mode, dual-source mode (DSM), and backup mode automatically by detecting the input and output conditions. Converter operation in the proposed DSM enables extraction of power from both a photovoltaic cell and a thermoelectric generator in one switching cycle for efficient power extraction. The cycle-by-cycle source-tracking approach selects the appropriate input source according to the maximum power point of the energy transducers. The adaptive on-time circuit with the proposed adaptive peak-inductor-current (APIC) control adjusts the on-time of power transistors to obtain high conversion efficiency under different input voltages. The experimental results demonstrate that the proposed SITITO converter has a peak efficiency of 84.4%. When compared with the conventional constant peak-inductor-current control, an efficiency improvement of 11% is obtained via the proposed APIC control.

Original languageEnglish
Article number8388277
Pages (from-to)2741-2750
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Issue number10
StatePublished - 1 Oct 2018


  • Adaptive peak-inductor-current (APIC) control
  • buck-boost converter
  • cycle-by-cycle source tracking (CCST)
  • DC-DC converter
  • dual source
  • energy harvesting


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