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Neural stimulators are a key component of neural SoC designed for treating neurological disorders and closing the feedback loop in brain computer interfaces. In this work introduce a wireless power system customized to power a monolithic implantable neural (ECoG) stimulation platform which has unique power profile. For majority of time period, the stimulator is inactive and the SoC consumes minimal...
Implantable neural recording and stimulation devices hold great promise in monitoring and treatment of neurological disorders, limb reanimation and, development of brain-computer interfaces among other applications. However, transcutaneous wires limit the lifetime of such devices and there is a need for self-contained fully implantable solutions. In this work, we propose a novel dual-frequency approach...
Near Field Communication (NFC) readers, ubiquitously embedded in smart-phones, buses and other infrastructures, are able to wirelessly deliver mW-level power to ultra-low power, passive NFC tags via a coupled magnetic field. Additionally, an NFC reader can leverage the coupled communication channel to support relatively heavy computational applications, such as sensing, visual displays, etc. Consequently,...
A dual-band wireless neural stimulation device with high frequency (HF) wireless power transfer (WPT) at 13.56MHz and ultra high frequency (UHF) backscatter communication (BSC) at 915MHz is presented. Neural interfaces hold great promise in the development of future treatment/therapy for debilitating neurological disorders, spinal cord damage, and loss of limb function. Most state-of-the-art wireless...
In-band load modulation as a means of transferring information from a wirelessly-powered client device to a power provider in a wireless power transfer (WPT) system has long been considered to have an unacceptable impact on the efficiency of power transfer. Conventional load modulation involves either completely or severely detuning the receive coil in order to produce a detectable amplitude shift...
Wireless charging standards for consumer devices include specifications for charging multiple receive devices simultaneously. However if the devices are not all the same size or if they require different amounts of power, these existing standards may be incapable of charging multiple devices efficiently. This paper provides an overview of a complete wireless power transfer system that is capable of...
Tissue heating is a key safety consideration in wireless power transfer (WPT) systems. Heating is regulated in the form of specific absorption rate (SAR) limitations to prevent dangerous conditions when wireless power transfer is used in proximity to people. Implanted biomedical devices which depend on wireless power transfer for their operation are particularly of interest, as a high potential for...
Wireless battery charging has been incorporated into an increasing number of commercial electronics with power requirements ranging from a few milliwatts to several hundred watts. With this growing number of deployed devices, there is a necessity to quickly locate and charge them individually. Conventional localization techniques either require intelligence and extra hardware or are limited to merely...
Optimization of coil sizes for wireless power transfer applications has a significant impact on the range and efficiency of the wireless power system. Often it is difficult to accurately analyze how a set of coils will perform before they are constructed due to the complexity of approximating the parasitic components and coupling coefficients associated with the coils. Also, for certain wireless power...
Wireless Power Transfer using magnetically coupled resonators has been widely used for biomedical and consumer electronics applications. However, typical analysis of wireless power transfer has focused on standard operating conditions (linear power source and fixed impedances Zs = ZL = Z0) and is not applicable for practical applications. In this work we use experimentally obtained S-parameters to...
Onboard power remains a major challenge for miniature robotic platforms. Locomotion at small scales demands high power densities from all system components, while limited payload capacities place severe restrictions on the size of the energy source, resulting in integration challenges and short operating times when using conventional batteries. Wireless power delivery has the potential to allow microrobotic...
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