Fully Integrated Voltage Doubler with Dual-Mode Three-Dimensional Load Regulation for On-Chip Photovoltaic-Powered Applications

Oi Ying Wong, Po-Hung Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This paper presents a compact and fully integrated switched-capacitor voltage doubler for voltage boosting in photovoltaic-powered implantable devices. Gate-voltage boosting, nonoverlapping, and interleaving techniques are adopted to enhance the driving capability of the voltage doubler at low supply voltage with high efficiency. A dual-mode three-dimensional (3-D) digital control circuit is proposed to regulate the output voltage under the load current variation. The 3-D control on the number of active converter cells, operation frequency, and on-resistance enable fine output voltage regulation over a wide load current range without extensive device segmentation, thereby reducing the routing complexity and the associated parasitic losses. Other advantages are that the switching loss can be proportionally scaled with the load current for high power efficiency and the periodic charge transfer to the output can keep small for small voltage ripple. Pulse-skipping modulation is employed to allow the converter to operate under ultra-light load. The proposed voltage doubler is designed and implemented using 0.18 μm-CMOS process. The measurement results demonstrate that the proposed converter can generate a voltage of 0.9 V from an input of 0.6 V, with a power efficiency of more than 60% within the output current range of 30-440 μA. The peak efficiency is 73% and the active area is 0.33 mm2. These measurement results suggest that the proposed voltage doubler is suitable for voltage boosting at low voltage under the limited availability of power and area.

Original languageEnglish
Article number8355771
Pages (from-to)1481-1491
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume34
Issue number2
DOIs
StatePublished - 1 Feb 2019

Keywords

  • Charge pump
  • photovoltaic (PV) cell
  • switch-capacitor (SC) DC-DC converter
  • voltage regulation

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