The Experts below are selected from a list of 46689 Experts worldwide ranked by ideXlab platform
David Blaauw - One of the best experts on this subject based on the ideXlab platform.
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a 42nj conversion on demand state of charge indicator for miniature iot li ion batteries
Asia and South Pacific Design Automation Conference, 2018Co-Authors: Junwon Jeong, Seokhyeon Jeong, Chulwoo Kim, Dennis Sylvester, David BlaauwAbstract:An energy efficient State-of-Charge (SOC) indication algorithm and integrated system for small IoT batteries are introduced in this paper. The system is implemented in a 180-nm CMOS technology. Based on a key finding that small Li-ion batteries exhibit a linear dependence between Battery Voltage and load current, we propose an instantaneous linear extrapolation (ILE) algorithm and circuit allowing on-demand estimation of SOC. Power consumption is 42nW and maximum SOC indication error is 1.7%.
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12 1 a rational conversion ratio switched capacitor dc dc converter using negative output feedback
International Solid-State Circuits Conference, 2016Co-Authors: Wanyeong Jung, Dennis Sylvester, David BlaauwAbstract:Switched-capacitor (SC) DC-DC converters have several advantages over inductive DC-DC converters in that they are easily integrated on-chip and can scale to desired power levels, rendering themselves promising for integrated Voltage regulators, especially for small, low-power systems. However, many SC DC-DC converters offer only a few conversion ratios, limiting their use for systems in which either the input or output Voltages vary. This is particularly important in wireless systems where Battery Voltage degrades slowly. [1] proposed a technique to reconfigure cascaded SC converters to achieve arbitrary binary ratios: p/2N, 0 90% efficiency when downconverting from 2V to a 1.1-to-1.86V output Voltage range.
Roberto Benato - One of the best experts on this subject based on the ideXlab platform.
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Sodium-nickel chloride Battery experimental transient modelling for energy stationary storage
Journal of Energy Storage, 2017Co-Authors: S. Dambone Sessa, Francesco Palone, Andrea Necci, Roberto BenatoAbstract:The paper presents the analysis of Sodium Nickel chloride batteries in transient operation, and proposes a simple but very precise model to represent both the transient and steady Battery behaviours. Hence, the main purpose of this model is to foresee the Battery Voltage during the most important network services, which require very fast transitions from the Battery charge operation to the discharge one. In order to validate the model, several comparisons between experimental measures and model results are shown.
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A general electric model of sodium-nickel chloride Battery
AEIT 2016 - International Annual Conference: Sustainable Development in the Mediterranean Area Energy and ICT Networks of the Future, 2016Co-Authors: Roberto Benato, S. Dambone Sessa, Andrea Necci, Francesco PaloneAbstract:The paper presents the analysis of Sodium Nickel chloride batteries in transient operation, and proposes a very simple but quite precise model to represent both the transient and steady Battery behaviours. The used modelling approach is based on steady state experimental measures. Sodium Nickel chloride batteries are one of the most promising technologies for electrical energy stationary storage in the high Voltage network. Hence, the main purpose of this model is to foresee the Battery Voltage during the most important network services, which require very fast transition from the Battery charge operation to the discharge one. In order to validate the model, several comparisons between experimental measures and model results are shown.
Hirofumi Akagi - One of the best experts on this subject based on the ideXlab platform.
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design and performance of a bidirectional isolated dc dc converter for a Battery energy storage system
IEEE Transactions on Power Electronics, 2012Co-Authors: Nadia Mei Lin Tan, Takahiro Abe, Hirofumi AkagiAbstract:This paper describes the design and performance of a 6-kW, full-bridge, bidirectional isolated dc-dc converter using a 20-kHz transformer for a 53.2-V, 2-kWh lithium-ion (Li-ion) Battery energy storage system. The dc Voltage at the high-Voltage side is controlled from 305 to 355 V, as the Battery Voltage at the low-Voltage side (LVS) varies from 50 to 59 V. The maximal efficiency of the dc-dc converter is measured to be 96.0% during Battery charging, and 96.9% during Battery discharging. Moreover, this paper analyzes the effect of unavoidable dc-bias currents on the magnetic-flux saturation of the transformer. Finally, it provides the dc-dc converter loss breakdown with more focus on the LVS converter.
Dennis Sylvester - One of the best experts on this subject based on the ideXlab platform.
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a 42nj conversion on demand state of charge indicator for miniature iot li ion batteries
Asia and South Pacific Design Automation Conference, 2018Co-Authors: Junwon Jeong, Seokhyeon Jeong, Chulwoo Kim, Dennis Sylvester, David BlaauwAbstract:An energy efficient State-of-Charge (SOC) indication algorithm and integrated system for small IoT batteries are introduced in this paper. The system is implemented in a 180-nm CMOS technology. Based on a key finding that small Li-ion batteries exhibit a linear dependence between Battery Voltage and load current, we propose an instantaneous linear extrapolation (ILE) algorithm and circuit allowing on-demand estimation of SOC. Power consumption is 42nW and maximum SOC indication error is 1.7%.
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12 1 a rational conversion ratio switched capacitor dc dc converter using negative output feedback
International Solid-State Circuits Conference, 2016Co-Authors: Wanyeong Jung, Dennis Sylvester, David BlaauwAbstract:Switched-capacitor (SC) DC-DC converters have several advantages over inductive DC-DC converters in that they are easily integrated on-chip and can scale to desired power levels, rendering themselves promising for integrated Voltage regulators, especially for small, low-power systems. However, many SC DC-DC converters offer only a few conversion ratios, limiting their use for systems in which either the input or output Voltages vary. This is particularly important in wireless systems where Battery Voltage degrades slowly. [1] proposed a technique to reconfigure cascaded SC converters to achieve arbitrary binary ratios: p/2N, 0 90% efficiency when downconverting from 2V to a 1.1-to-1.86V output Voltage range.
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a fully integrated successive approximation switched capacitor dc dc converter with 31mv output Voltage resolution
International Solid-State Circuits Conference, 2013Co-Authors: Suyoung Bang, Allan Wang, Bharan Giridhar, D Blaauw, Dennis SylvesterAbstract:Ultra-low power microsystems are gaining more popularity due to their applicability in critical areas of societal need. Power management in these microsystems is a major challenge as a relatively high Battery Voltage (e.g., 4V) must be down-converted to several low supplies, such as 0.6V for near-threshold digital circuits and 1.2V for analog circuits [1]. Furthermore, the small form factors of such systems rule out the use of external inductors, making switched-capacitor (SC) DC-DC converters the favored topology [2-4].
Ali Emadi - One of the best experts on this subject based on the ideXlab platform.
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a new Battery ultracapacitor hybrid energy storage system for electric hybrid and plug in hybrid electric vehicles
IEEE Transactions on Power Electronics, 2012Co-Authors: Jian Cao, Ali EmadiAbstract:In this paper, a new Battery/ultracapacitor hybrid energy storage system (HESS) is proposed for electric drive vehicles including electric, hybrid electric, and plug-in hybrid electric vehicles. Compared to the conventional HESS design, which uses a larger dc/dc converter to interface between the ultracapacitor and the Battery/dc link to satisfy the real-time peak power demands, the proposed design uses a much smaller dc/dc converter working as a controlled energy pump to maintain the Voltage of the ultracapacitor at a value higher than the Battery Voltage for the most city driving conditions. The Battery will only provide power directly when the ultracapacitor Voltage drops below the Battery Voltage. Therefore, a relatively constant load profile is created for the Battery. In addition, the Battery is not used to directly harvest energy from the regenerative braking; thus, the Battery is isolated from frequent charges, which will increase the life of the Battery. Simulation and experimental results are presented to verify the proposed system.
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a new Battery ultra capacitor hybrid energy storage system for electric hybrid and plug in hybrid electric vehicles
Vehicle Power and Propulsion Conference, 2009Co-Authors: Jian Cao, Ali EmadiAbstract:In this paper, a new Battery/ultra-capacitor hybrid energy storage system (HESS) is proposed for electric drive vehicles including electric, hybrid electric, and plug-in hybrid electric vehicles. Compared to the conventional HESS design, which requires a larger DC/DC converter to interface between the ultra-capacitor and the Battery/DC link, the new design uses a much smaller DC/DC converter to maintain the Voltage of the ultra-capacitor at a value higher than the Battery Voltage. In addition, the Battery directly provides power when the ultracapacitor Voltage drops below the Battery Voltage. Therefore, a relatively constant load profile is created for the Battery. In addition, the Battery is not used to directly harvest energy from the regenerative braking; thus, the Battery is isolated from random charges, which will increase the life of the Battery. The proposed topology has the possibility of utilizing the system configuration for fast charging via the ultra-capacitor.
