1 / 12

Power Management Strategies for Ultra-Low Power SoCs: Enhancing Energy Efficiency in BSNs

This document explores advanced power management solutions for ultra-low power System-on-Chips (SoCs), specifically focusing on Body Sensor Networks (BSNs). As BSNs require extended lifetimes for ubiquitous deployment, energy harvesting and efficient power distribution are crucial. Strategies include optimizing voltage regulation across multiple outputs and minimizing losses, with a focus on replacing traditional Low Dropout Regulators (LDOs). The research emphasizes the need for efficient energy harvesting systems to ensure BSNs perform reliably within energy-constrained environments.

taffy
Télécharger la présentation

Power Management Strategies for Ultra-Low Power SoCs: Enhancing Energy Efficiency in BSNs

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Power Management Solutions for ULP SoCsDeliberate Practice -I Seyiand Aatmesh 1st May 2013

  2. Ultra Low Power SoCs ( e.g. BSN) • BSNs promise to change the way we live • Need higher life-time for ubiquitous deployment • Energy harvesting and Power Management is critical

  3. Power Distribution in BSN 19µW out of 50µW from TEG Y. Zhang, et al, "A Batteryless19uW…. ", JSSC, Jan. 2013. • Efficient energy-harvesting ( E-harvesting) • To increase the amount of harvested energy • Efficient multiple regulated output voltages • To minimize the loss in voltage regulation • Power Management critical to BSN lifetime

  4. Power Supply Needs • A. Wang, et al, “A 180-mV Subthreshold …” JSSC, Jan. 2005 • Optimal energy point exists for each blocks such as CPU, Analog, RF etc. • Multiple regulated output voltages is needed.

  5. Power Supply needs for BSN • Optimal voltages exists for each Block in a BSN, which needs multiple supplies for BSN • Since BSNs operate in energy constrained environment each supply should be efficient • BSNs need efficient energy harvesting to further extend the lifetime

  6. Limitation of existing solution LDO • Input power to the IC • VDD*I • Power taken from the source • Vin*I • Ideal Efficiency is given by, • VDD*I/Vin*I=VDD/Vin • Ex, Vin=1.2V and VDD=0.5V • Efficiency is 0.41 or ~40%. • Almost 60% of power is lost in regulation I I

  7. State of the art BSN SoC Power Management Y. Zhang, et al, "A Batteryless19uW…. ", JSSC, Jan. 2013. • Boost converter harvests the energy on to a capacitor at 1.35V • Multiple rails are served by linear regulators • 63% 23% and 12% energy is lost in voltage regulation.

  8. Research Questions • There is a theoretical limit on the efficiency of LDO. • What can replace LDOs ??

  9. State of the art BSN SoC Power Management Y. Zhang, et al, "A Batteryless19uW…. ", JSSC, Jan. 2013. • Boost converter harvests the energy on to a capacitor at 1.35V • Multiple rails are served by linear regulators • 63% 23% and 12% energy is lost in voltage regulation.

  10. Research Questions • BSN needs multiple output voltages. • How do solutions replacing LDOs can address this problem?

  11. Energy Harvesting • State of the art solution is 38% efficient. • How can we raise this efficiency? Y. Zhang, et al, "A Batteryless19uW…. ", ISSCC, Feb. 2012.

  12. Research Questions • How voltage regulation and energy harvesting solution integrate together for BSN? • Cost of the solution? • Monitoring the power levels. e.g. DPM ( Shaksheer et. al.)

More Related