A 90% efficiency 60 mW MPPT switched capacitor DC - DC converter for photovoltaic energy harvesting aiming for IoT applications

This work presents a six phase Switched Capacitor (SC) DC - DC converter for photovoltaic Energy Harvesting designed in a 130 nm CMOS process for commercial motes application and Internet of Things (IoT). It tracks the Maximum Power Point (MPP) of a commercial 3 cm × 3 cm 60 mW poly-crystalline phot...

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Bibliographic Details
Main Authors: Brito Zamparette, Roger Luis, Klimach, Hamilton Duarte, Bampi, Sergio
Format: Conference Proceeding
Language:English
Subjects:
Batteries
Capacitance
Capacitors
CMOS
DC-DC converter
IoT
MPPT
Photo-voltaic Energy Harvesting
Switched Capacitor
Switches
Switching frequency
Topology
Transistors
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Summary:This work presents a six phase Switched Capacitor (SC) DC - DC converter for photovoltaic Energy Harvesting designed in a 130 nm CMOS process for commercial motes application and Internet of Things (IoT). It tracks the Maximum Power Point (MPP) of a commercial 3 cm × 3 cm 60 mW poly-crystalline photoelectric panel through switching frequency modulation aiming battery recharge. Open-circuit voltage ratio was the chosen Maximum Power Point Tracking (MPPT) strategy. The converter achieves a maximum power conversion efficiency of 90 % for input power higher than 30 mW and is designed to operate with input voltages from 1.25 V to 1.8 V, resulting output voltages from 2.5 V to 3.6 V, respectively. Peripheral circuitry also includes an output over-voltage protection of 3.6 V and the control circuits, that consumes a total of 850 μA at 3.3 V. Complete layout consumes 300 × 700 μm 2 of silicon area. The only external components are 6×100 nF capacitors.
ISSN:2473-4667
DOI:10.1109/LASCAS.2017.7948099