HypoEnergy. Hybrid supercapacitor-battery power-supply optimization for Energy efficiency

Mirhoseini, Azalia; Koushanfar, Farinaz

doi:10.1109/date.2011.5763298

Cited by 33 publications

(29 citation statements)

References 13 publications

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“…Prior work has explored hybrid battery-ultracapacitor power sources to support burst currents in larger electronic systems [34] and to improve battery efficiency [32,33]. The latest ultra-capacitors have the potential to meet our requirements for energy capacity, peak current, and form factor with negligible energy losses due to leakage.…”

Section: Power Sourcementioning

confidence: 99%

Computational sprinting

Raghavan

Luo

Chandawalla

et al. 2012

IEEE International Symposium on High-Performance Comp Architecture

155

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Although transistor density continues to increase, voltage scaling has stalled and thus power density is increasing each technology generation. Particularly in mobile devices, which have limited cooling options, these trends lead to a utilization wall in which sustained chip performance is limited primarily by power rather than area. However, many mobile applications do not demand sustained performance; rather they comprise short bursts of computation in response to sporadic user activity.To improve responsiveness for such applications, this paper explores activating otherwise powered-down cores for sub-second bursts of intense parallel computation. The approach exploits the concept of computational sprinting, in which a chip temporarily exceeds its sustainable thermal power budget to provide instantaneous throughput, after which the chip must return to nominal operation to cool down. To demonstrate the feasibility of this approach, we analyze the thermal and electrical characteristics of a smart-phone-like system that nominally operates a single core (∼1W peak), but can sprint with up to 16 cores for hundreds of milliseconds. We describe a thermal design that incorporates phase-change materials to provide thermal capacitance to enable such sprints. We analyze image recognition kernels to show that parallel sprinting has the potential to achieve the task response time of a 16W chip within the thermal constraints of a 1W mobile platform.

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Section: Power Sourcementioning

confidence: 99%

Computational sprinting

Raghavan

Luo

Chandawalla

et al. 2012

IEEE International Symposium on High-Performance Comp Architecture

155

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“…Recently a hybrid battery-supercapacitor power-supply system has been proposed in which the hybrid source's charge/discharge policy is made based upon the load profile and supply's state. The work includes a novel algorithm to maximize the supply system's lifetime [3]. A number of limited earlier studies have already shown the benefits of a hybrid supercapacitor and solar energy generation system in optimizing system's efficiency and dynamic response time, in particular for transient loads with a low duty cycle and also for pulsed loads in sensor networks [4], [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Hybrid heterogeneous energy supply networks

Koushanfar

Mirhoseini

2011

2011 IEEE International Symposium of Circuits and Systems (ISCAS)

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Abstract-Efficient energy supply, storage, and distribution are key technical challenges for design and operation of electronic systems. In particular, energy supply is the most scarce resource and constraint for mobile embedded systems where the supply lifetime, cost, weight, size, and portability are major concerns. With the advent of newer electrical energy supply and storage technologies, energy supplies with differing energy/power storage densities, cost, size, and recycling abilities are becoming available. Efficient system design requires an exact matching between the fluctuating load demands and the underlying energy resources. Combining the energy supplies in a hierarchical way creates a unique opportunity for efficient matching and variable load serving. Such a heterogeneous hybrid network of energy supply components could address a variety of power needs and serve a much broader range of system loads with a high efficiency. This paper presents a Hierarchial Architecture of Heterogenous Electrical Energy Supplies (HierArcHEES) that can be tuned to different load demands.

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“…For the example, we considered the workload scenarios of Figure 2, which are essentially based on the iPhone battery current measurements in [18,22]. The tasks considered in the scenarios include airplane mode (40 mA), default mode (100 mA), working internet with 3G network (310 mA), working game application "Tap-Tap" (220 mA), working 3D game application "GTI Racing" (400 mA), working application "YouTube" with WiFi (260 mA), working application "YouTube" (350 mA), and voice phone (170 mA) [18].…”

Section: An Illustrative Examplementioning

confidence: 99%

Dynamic Power Management for Portable Hybrid Power-Supply Systems Utilizing Approximate Dynamic Programming

et al. 2015

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Abstract:Recently, the optimization of power flows in portable hybrid power-supply systems (HPSSs) has become an important issue with the advent of a variety of mobile systems and hybrid energy technologies. In this paper, a control strategy is considered for dynamically managing power flows in portable HPSSs employing batteries and supercapacitors. Our dynamic power management strategy utilizes the concept of approximate dynamic programming (ADP). ADP methods are important tools in the fields of stochastic control and machine learning, and the utilization of these tools for practical engineering problems is now an active and promising research field. We propose an ADP-based procedure based on optimization under constraints including the iterated Bellman inequalities, which can be solved by convex optimization carried out offline, to find the optimal power management rules for portable HPSSs. The effectiveness of the proposed procedure is tested through dynamic simulations for smartphone workload scenarios, and simulation results show that the proposed strategy can successfully cope with uncertain workload demands.

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HypoEnergy. Hybrid supercapacitor-battery power-supply optimization for Energy efficiency

Cited by 33 publications

References 13 publications

Computational sprinting

Computational sprinting

Hybrid heterogeneous energy supply networks

Dynamic Power Management for Portable Hybrid Power-Supply Systems Utilizing Approximate Dynamic Programming

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