A Novel Power Delivery Method for Asynchronous Loads in Energy Harvesting Systems XUEFU ZHANG, DELONG SHANG, FEI XIA, and ALEX YAKOVLEV, Newcastle University For systems depending on power harvesting, a fundamental contradiction in the power delivery chain has existed between conventional synchronous computational loads requiring relatively stable Vdd and power harvesters unable to supply it. DC/DC conversion has therefore been an integral part of such systems to resolve this contradiction. On the other hand, asynchronous computational loads, in addition to their potential power-saving capabilities, can be made tolerant to a much wider range of Vdd variance. This may open up opportunities for much more energy ef cient methods of power delivery. This article presents indepth investigations into the behavior and performance of different on-chip power delivery methods driving both asynchronous and synchronous loads directly from a harvester source. A novel power delivery method, which employs a capacitor bank for adaptively storing the energy from power harvesters depending on load and source conditions, is developed. Its advantages, especially when driving asynchronous loads, are demonstrated through comprehensive comparative analysis. Categories and Subject Descriptors: D.4.1 [Operating Systems]: Process Management Multiprocessing/ multiprogramming/multitasking; scheduling; C.1.3 [Processor Architectures]: Other Architectural Styles Adaptable architectures General
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A Novel Power Delivery Method for Asynchronous Loads in Energy Harvesting Systems
Zhang, Xuefu; Shang, Delong; Xia, Fei; Yakovlev, Alex
Follow ACM Journal on Emerging Technologies in Computing Systems (JETC)
, Volume 7 (4)
Association for Computing Machinery – Dec 1, 2011
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