Fully-integrated switched-capacitor voltage boost converter with digital maximum power point tracking for low-voltage energy harvesting

Abstract

This paper proposes a fully-integrated switched-capacitor (SC) voltage boost converter (VBC) with a digital maximum power point tracking (MPPT) control circuit for low-voltage and low-power energy harvesting. The proposed digital MPPT control circuit converts analog voltage information of a PV cell into digital values and extracts the maximum power regardless of the harvester conditions and load current. Measurement results demonstrated that our proposed circuit can track the maximum power point of a PV cell successfully. The maximum voltage conversion ratio of our circuit was 5.6. The proposed power management system (PMS) generated a 2.58-V output voltage from a 0.46-V input voltage. The maximum power conversion efficiency was 63.6%.

Ultra-low power low-dropout linear regulator with a load current tracking bias current generator for loT devices

“…[1][2][3][4][5][6][7][8][9][10][11] Energy harvesting has attracted attention as an alternative power source of batteries. [12][13][14][15][16][17][18][19][20][21][22][23][24] However, the output voltage and power of small energy harvesters are basically weak and easily lost, while the operating voltage of IoT devices will be 1.2 V or higher and the current consumption in IoT devices will be in the ranges from several nA to several hundred μA. 2) Thus, a power management system (PMS) is necessary for stable and sustainable operation.…”

Sub-50 mV power supply, recursive stacking body bias NAND gate for extremely low-voltage CMOS LSIs

“…To address the issues, energy harvesting techniques have been investigated to realize such systems without using batteries. [1][2][3][4][5] Systems using thermal energy, [6][7][8][9][10][11][12][13][14] solar energy, [15][16][17] and electromagnetic energy, 18) have been developed and reported.…”