The Experts below are selected from a list of 257478 Experts worldwide ranked by ideXlab platform
M M Jovanovic - One of the best experts on this subject based on the ideXlab platform.
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closed Loop Control methods for interleaved dcm ccm boundary boost pfc converters
Applied Power Electronics Conference, 2009Co-Authors: Laszlo Huber, Brian T Irving, M M JovanovicAbstract:In this paper, a systematic overview of PLL-based closed-Loop Control methods for interleaved DCM/CCM boundary boost PFC converters is presented. It is shown that the PLL-based closed-Loop methods always provide stable operation, unlike the open-Loop Control methods, where the only method which results in stable operation is the slave synchronization to the turn-on instant of the master with current-mode Control. It is also shown that the dynamic response of the PLL-based closed-Loop methods with master-slave approach and democratic approach is almost identical. Experimental results obtained on a 300-W, universal input, 400-V output, interleaved DCM/CCM boundary boost PFC prototype circuit with a dedicated Controller IC utilizing a democratic, PLL-based closed-Loop method is also provided.
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implementation of open Loop Control for interleaved dcm ccm boundary boost pfc converters
Applied Power Electronics Conference, 2008Co-Authors: Laszlo Huber, Brian T Irving, Claudio Adragna, M M JovanovicAbstract:This paper is focused on the implementation of the open-Loop Control method for interleaved DCM/CCM boundary boost PFC converters where the slave converter is synchronized to the turn-on instant of the master converter and both converters operate with current-mode Control. It is shown that this method is the only open-Loop Control method that provides a stable operation. Implementations of the master-slave synchronization circuit in both analog and digital technology are described. Experimental results obtained on a 400-W, universal input, 400-V output prototype circuit with two interleaved DCM/CCM boundary boost PFC converters Controlled by an integrated Control circuit currently being developed are provided.
Maurizio Porfiri - One of the best experts on this subject based on the ideXlab platform.
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closed Loop Control of zebrafish response using a bioinspired robotic fish in a preference test
Journal of the Royal Society Interface, 2013Co-Authors: Vladislav Kopman, Jeffrey Laut, Giovanni Polverino, Maurizio PorfiriAbstract:In this paper, we study the response of zebrafish to a robotic-fish whose morphology and colour pattern are inspired by zebrafish. Experiments are conducted in a three-chambered instrumented water tank where a robotic-fish is juxtaposed with an empty compartment, and the preference of live subjects is scored as the mean time spent in the vicinity of the tank's two lateral sides. The tail-beating of the robotic-fish is Controlled in real-time based on feedback from fish motion to explore a spectrum of closed-Loop systems, including proportional and integral Controllers. Closed-Loop Control systems are complemented by open-Loop strategies, wherein the tail-beat of the robotic-fish is independent of the fish motion. The preference space and the locomotory patterns of fish for each experimental condition are analysed and compared to understand the influence of real-time closed-Loop Control on zebrafish response. The results of this study show that zebrafish respond differently to the pattern of tail-beating motion executed by the robotic-fish. Specifically, the preference and behaviour of zebrafish depend on whether the robotic-fish tail-beating frequency is Controlled as a function of fish motion and how such closed-Loop Control is implemented.
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closed Loop Control of zebrafish response using a bioinspired robotic fish in a preference test
Journal of the Royal Society Interface, 2013Co-Authors: Vladislav Kopman, Jeffrey Laut, Giovanni Polverino, Maurizio PorfiriAbstract:In this paper, we study the response of zebrafish to a robotic-fish whose morphology and colour pattern are inspired by zebrafish. Experiments are conducted in a three-chambered instrumented water tank where a robotic-fish is juxtaposed with an empty compartment, and the preference of live subjects is scored as the mean time spent in the vicinity of the tank's two lateral sides. The tail-beating of the robotic-fish is Controlled in real-time based on feedback from fish motion to explore a spectrum of closed-Loop systems, including proportional and integral Controllers. Closed-Loop Control systems are complemented by open-Loop strategies, wherein the tail-beat of the robotic-fish is independent of the fish motion. The preference space and the locomotory patterns of fish for each experimental condition are analysed and compared to understand the influence of real-time closed-Loop Control on zebrafish response. The results of this study show that zebrafish respond differently to the pattern of tail-beating motion executed by the robotic-fish. Specifically, the preference and behaviour of zebrafish depend on whether the robotic-fish tail-beating frequency is Controlled as a function of fish motion and how such closed-Loop Control is implemented.
Bruce Macintosh - One of the best experts on this subject based on the ideXlab platform.
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Performance of MEMS-based visible-light adaptive optics at Lick Observatory: closed- and open-Loop Control
Proceedings of SPIE, 2010Co-Authors: Katie M. Morzinski, Bryant Grigsby, Donald Gavel, Marc Reinig, Luke Johnson, Daren Dillon, Bruce MacintoshAbstract:At the University of California's Lick Observatory, we have implemented an on-sky testbed for next-generation adaptive optics (AO) technologies. The Visible-Light Laser Guidestar Experiments instrument (ViLLaGEs) includes visible-light AO, a micro-electro-mechanical-systems (MEMS) deformable mirror, and open-Loop Control of said MEMS on the 1-meter Nickel telescope at Mt. Hamilton. (Open-Loop in this sense refers to the MEMS being separated optically from the wavefront sensing path; the MEMS is still included in the Control Loop.) Future upgrades include predictive Control with wind estimation and pyramid wavefront sensing. Our unique optical layout allows the wavefronts along the open- and closed-Loop paths to be measured simultaneously, facilitating comparison between the two Control methods. In this paper we evaluate the performance of ViLLaGEs in openand closed-Loop Control, finding that both Control methods give equivalent Strehl ratios of up to ~ 7% in I-band and similar rejection of temporal power. Therefore, we find that open-Loop Control of MEMS on-sky is as effective as closed-Loop Control. Furthermore, after operating the system for three years, we find MEMS technology to function well in the observatory environment. We construct an error budget for the system, accounting for 130 nm of wavefront error out of 190 nm error in the science-camera PSFs. We find that the dominant known term is internal static error, and that the known contributions to the error budget from open-Loop Control (MEMS model, position repeatability, hysteresis, and WFS linearity) are negligible.
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performance of mems based visible light adaptive optics at lick observatory closed and open Loop Control
arXiv: Instrumentation and Methods for Astrophysics, 2010Co-Authors: Katie M. Morzinski, Bryant Grigsby, Donald Gavel, Marc Reinig, Luke Johnson, Bruce Macintosh, Daren DillonAbstract:At the University of California's Lick Observatory, we have implemented an on-sky testbed for next-generation adaptive optics (AO) technologies. The Visible-Light Laser Guidestar Experiments instrument (ViLLaGEs) includes visible-light AO, a micro-electro-mechanical-systems (MEMS) deformable mirror, and open-Loop Control of said MEMS on the 1-meter Nickel telescope at Mt. Hamilton. In this paper we evaluate the performance of ViLLaGEs in open- and closed-Loop Control, finding that both Control methods give equivalent Strehl ratios of up to ~ 7% in I-band and similar rejection of temporal power. Therefore, we find that open-Loop Control of MEMS on-sky is as effective as closed-Loop Control. Furthermore, after operating the system for three years, we find MEMS technology to function well in the observatory environment. We construct an error budget for the system, accounting for 130 nm of wavefront error out of 190 nm error in the science-camera PSFs. We find that the dominant known term is internal static error, and that the known contributions to the error budget from open-Loop Control (MEMS model, position repeatability, hysteresis, and WFS linearity) are negligible.
Laszlo Huber - One of the best experts on this subject based on the ideXlab platform.
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closed Loop Control methods for interleaved dcm ccm boundary boost pfc converters
Applied Power Electronics Conference, 2009Co-Authors: Laszlo Huber, Brian T Irving, M M JovanovicAbstract:In this paper, a systematic overview of PLL-based closed-Loop Control methods for interleaved DCM/CCM boundary boost PFC converters is presented. It is shown that the PLL-based closed-Loop methods always provide stable operation, unlike the open-Loop Control methods, where the only method which results in stable operation is the slave synchronization to the turn-on instant of the master with current-mode Control. It is also shown that the dynamic response of the PLL-based closed-Loop methods with master-slave approach and democratic approach is almost identical. Experimental results obtained on a 300-W, universal input, 400-V output, interleaved DCM/CCM boundary boost PFC prototype circuit with a dedicated Controller IC utilizing a democratic, PLL-based closed-Loop method is also provided.
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implementation of open Loop Control for interleaved dcm ccm boundary boost pfc converters
Applied Power Electronics Conference, 2008Co-Authors: Laszlo Huber, Brian T Irving, Claudio Adragna, M M JovanovicAbstract:This paper is focused on the implementation of the open-Loop Control method for interleaved DCM/CCM boundary boost PFC converters where the slave converter is synchronized to the turn-on instant of the master converter and both converters operate with current-mode Control. It is shown that this method is the only open-Loop Control method that provides a stable operation. Implementations of the master-slave synchronization circuit in both analog and digital technology are described. Experimental results obtained on a 400-W, universal input, 400-V output prototype circuit with two interleaved DCM/CCM boundary boost PFC converters Controlled by an integrated Control circuit currently being developed are provided.
Vladislav Kopman - One of the best experts on this subject based on the ideXlab platform.
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closed Loop Control of zebrafish response using a bioinspired robotic fish in a preference test
Journal of the Royal Society Interface, 2013Co-Authors: Vladislav Kopman, Jeffrey Laut, Giovanni Polverino, Maurizio PorfiriAbstract:In this paper, we study the response of zebrafish to a robotic-fish whose morphology and colour pattern are inspired by zebrafish. Experiments are conducted in a three-chambered instrumented water tank where a robotic-fish is juxtaposed with an empty compartment, and the preference of live subjects is scored as the mean time spent in the vicinity of the tank's two lateral sides. The tail-beating of the robotic-fish is Controlled in real-time based on feedback from fish motion to explore a spectrum of closed-Loop systems, including proportional and integral Controllers. Closed-Loop Control systems are complemented by open-Loop strategies, wherein the tail-beat of the robotic-fish is independent of the fish motion. The preference space and the locomotory patterns of fish for each experimental condition are analysed and compared to understand the influence of real-time closed-Loop Control on zebrafish response. The results of this study show that zebrafish respond differently to the pattern of tail-beating motion executed by the robotic-fish. Specifically, the preference and behaviour of zebrafish depend on whether the robotic-fish tail-beating frequency is Controlled as a function of fish motion and how such closed-Loop Control is implemented.
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closed Loop Control of zebrafish response using a bioinspired robotic fish in a preference test
Journal of the Royal Society Interface, 2013Co-Authors: Vladislav Kopman, Jeffrey Laut, Giovanni Polverino, Maurizio PorfiriAbstract:In this paper, we study the response of zebrafish to a robotic-fish whose morphology and colour pattern are inspired by zebrafish. Experiments are conducted in a three-chambered instrumented water tank where a robotic-fish is juxtaposed with an empty compartment, and the preference of live subjects is scored as the mean time spent in the vicinity of the tank's two lateral sides. The tail-beating of the robotic-fish is Controlled in real-time based on feedback from fish motion to explore a spectrum of closed-Loop systems, including proportional and integral Controllers. Closed-Loop Control systems are complemented by open-Loop strategies, wherein the tail-beat of the robotic-fish is independent of the fish motion. The preference space and the locomotory patterns of fish for each experimental condition are analysed and compared to understand the influence of real-time closed-Loop Control on zebrafish response. The results of this study show that zebrafish respond differently to the pattern of tail-beating motion executed by the robotic-fish. Specifically, the preference and behaviour of zebrafish depend on whether the robotic-fish tail-beating frequency is Controlled as a function of fish motion and how such closed-Loop Control is implemented.
