Energy Scavenging for Magnetically Coupled Communication Devices

CRC Press
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Green Mobile Devices and Network, 2012, 1, pp. 211 - 254
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Energy scavenging dates back to the use of waterwheels and windmills to harvest the energy from the surrounding environment and convert it to useful forms of energy [1]. Energy scavenging techniques have been around for decades to provide electricity from different natural resources, such as wind power, water flow, heat, sunlight, and vibration. However, there has been a new interest in energy harvesting methods recently, due to the mass increase of wireless sensors and low power electronics [1]. Electronic devices, such as mobile phones, laptops, PDAs (Personal DigitalAssistants),medical implant devices, and differenttypes ofsensor nodes, all require a powersourceto operate.Therefore, they are providedwith eitherwires or disposable/rechargeable batteries to supply the power.Thanks to advanced fabrication technologies, very smallsized batteries areintroduced,which aresmallenough to belocated on a chip to power up a sensor node or a smallelectronic handheld [1]. The problem with batteries is that they havelimited lifetimes or they arerequired to berecharged on a regular basis. However, there have been technology advances to optimizethe battery performance and itslifetime,such as dynamic optimization of voltage and clock rate, hybrid analog digital designs, and clever wake up procedures that allow a deviceto go to inactive mode when it is not required to operate a task [1]
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