This book discusses the design and implementation of energy harvesting systems targeting wearable devices. The authors describe in detail the different energy harvesting sources that can be utilized for powering low-power devices in general, focusing on the best candidates for wearable applications. Coverage also includes state-of-the-art interface circuits, which can be used to accept energy from harvesters and deliver it to a device in the most efficient way. Finally, the authors present power management circuits for using multiple energy harvesting sources at the same time to power devices and to enhance efficiency of the system.
1 Introduction
1.1 Wearable Devices and Battery Technology in IoTs
1.2 Energy Harvesting and Autonomous Systems
2 Energy Harvesting Sources, Models and Circuits
2.1 Energy Harvesters
2.1.1 Thermoelectric Generators
2.1.1.1 Human Body Thermal Harvesting
2.1.2 Piezoelectric Harvesters
2.1.2.1 Human Body Movement Characterization
2.1.3 RF Harvesting
2.1.3.1 Characterization of RF Energy Harvesting at 2.4 GHz
2.1.4 Solar Harvesting
2.2 Power Conversion Circuits
2.2.1 Linear Regulators
2.2.2 Switched Capacitor Circuit
2.2.3 Switching Converters
3 Interface Circuits for Thermoelectric Generator
3.1 Inductor-based DC-DC Converters
3.1.1 An asynchronous inductor-based DC-DC converter
3.1.2 A synchronous inductor-based DC-DC converter
3.2 Design of the Synchronous Inductor-based Boost Converter
3.2.1 Losses in the inductor-based Boost Clƒ%
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