A 0.1–0.6 V input range voltage boost converter with low-leakage driver for low-voltage energy harvesting

摘要

This paper proposes a fully integrated voltage boost converter (VBC) for low-voltage energy harvesting. The proposed VBC consists of three stage charge pumps (CPs) with a low-leakage driver, ring oscillator, and 4-phase clock generator. The output voltage is four times higher than an input voltage Fin. The low-leakage driver generates control signals to operate CPs with low leakage current. The amplitude of the control signals is 2V_INand does not depend on the load current. The proposed VBC achieves a wide load current, high output voltage, and high efficiency, even with a low-voltage input of the harvester. Simulation results demonstrated that the proposed VBC converted 0.1-V input to 0.362-V output and 0.6-V input to 2.38-V output, when the load current is zero. The peak efficiency was 70.3% at a 0.6-V input and 1-mA load current.