The Experts below are selected from a list of 92481 Experts worldwide ranked by ideXlab platform
Cong Zheng - One of the best experts on this subject based on the ideXlab platform.
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design considerations to reduce gap variation and misalignment effects for the inductive power transfer system
IEEE Transactions on Power Electronics, 2015Co-Authors: Cong Zheng, Lanhua ZhangAbstract:An inductive power transfer (IPT) system usually consists of four parts: an ac–dc power factor correction (PFC) converter, a high-frequency dc–ac inverter, a compensation network comprising a loosely coupled transformer (LCT) and the resonant capacitors, and a rectification Output Circuit. Due to the relatively large air gap, the magnetic coupling coefficient of the IPT system is significantly lower than that with tightly coupled transformer. As a result, the efficiency of the IPT system is always a main concern for applications with possible gap variation or misalignment condition. To ensure high power transfer efficiency, these IPT systems should have high tolerance for different gap variation and horizontal misalignment conditions. In this paper, the effect of coupling coefficient deviation to compensation network efficiency is analyzed, and design considerations to reduce gap and misalignment effects for the IPT system are proposed. By using finite-element analysis simulation method, the performance of different transmitter and receiver coil dimensions is compared. In order to validate the performance of the proposed design considerations, a 100-W hardware prototype with two sets of LCT is built and the corresponding experiments are carried out. As compared to the symmetrical LCT architecture, the proposed asymmetrical LCT prototype improves the coupling coefficient reduction from 68% to 28% when the gap varies from 6 to 20 mm and from 89% to 31% when the misalignment ranges from 0 to 50 mm. Therefore, the efficiency deviation for the asymmetrical LCT is maintained within 3.5% over the entire tested gap variation and misalignment ranges.
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high efficiency contactless power transfer system for electric vehicle battery charging application
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2015Co-Authors: Cong Zheng, Rui Chen, Zaka Ullah Zahid, Jih-sheng Lai, William Eric Faraci, Bin Gu, Lanhua Zhang, Gianpaolo Lisi, Dave AndersonAbstract:In this paper, a contactless charging system for an electric vehicle (EV) battery is proposed. The system consists of three parts: 1) a high-frequency power supply from a full-bridge inverter with frequency modulation; 2) a loosely coupled transformer that utilizes series resonant capacitors for both the primary and secondary windings; and 3) a rectification Output Circuit that uses a full-bridge diode rectifier. With carefully selected compensation network parameters, zero-voltage switching can be ensured for all the primary switches within the full range of an EV battery charging procedure, which allows the use of low ON-state resistance power MOSFETs to achieve high-frequency operation and system efficiency. The design of loosely coupled transformer is simulated and verified by finite element analysis software. For a 4-kW hardware prototype, the peak dc–dc efficiency reaches 98% and 96.6% under 4- and 8-cm air gap conditions, respectively. The prototype was tested with an electronic load and a home-modified EV to verify the performance of constant current and constant voltage control and their transitions.
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High efficiency contactless power transfer system for electric vehicle battery charging
2013 IEEE Energy Conversion Congress and Exposition, 2013Co-Authors: Cong Zheng, Rui Chen, Eric Faraci, Zaka Ullah Zahid, Matthew Senesky, Dave Anderson, Jih-sheng Lai, Wensong Yu, Chien-yu LinAbstract:In this paper, a contactless charging system for an electric vehicle (EV) battery is proposed. The system is composed of three parts, a high frequency power supply from a full-bridge inverter with frequency modulation, a loosely coupled transformer that utilizes series resonant capacitors for both the primary and secondary windings, and a rectification Output Circuit that uses a full-bridge diode rectifier. With carefully selected compensation network parameters, zero-voltage switching (ZVS) can be ensured for all the primary switches within the full range of an EV battery charging procedure, which allows the use of low on-state resistance power MOSFETs to achieve high frequency operation and system efficiency. The design of loosely coupled transformer is simulated and verified by finite element analysis (FEA) software. A peak efficiency of 96.6% is achieved with a 4 kW prototype with an 8 cm air gap transformer and 156 kHz switching frequency.
Dave Anderson - One of the best experts on this subject based on the ideXlab platform.
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high efficiency contactless power transfer system for electric vehicle battery charging application
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2015Co-Authors: Cong Zheng, Rui Chen, Zaka Ullah Zahid, Jih-sheng Lai, William Eric Faraci, Bin Gu, Lanhua Zhang, Gianpaolo Lisi, Dave AndersonAbstract:In this paper, a contactless charging system for an electric vehicle (EV) battery is proposed. The system consists of three parts: 1) a high-frequency power supply from a full-bridge inverter with frequency modulation; 2) a loosely coupled transformer that utilizes series resonant capacitors for both the primary and secondary windings; and 3) a rectification Output Circuit that uses a full-bridge diode rectifier. With carefully selected compensation network parameters, zero-voltage switching can be ensured for all the primary switches within the full range of an EV battery charging procedure, which allows the use of low ON-state resistance power MOSFETs to achieve high-frequency operation and system efficiency. The design of loosely coupled transformer is simulated and verified by finite element analysis software. For a 4-kW hardware prototype, the peak dc–dc efficiency reaches 98% and 96.6% under 4- and 8-cm air gap conditions, respectively. The prototype was tested with an electronic load and a home-modified EV to verify the performance of constant current and constant voltage control and their transitions.
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High efficiency contactless power transfer system for electric vehicle battery charging
2013 IEEE Energy Conversion Congress and Exposition, 2013Co-Authors: Cong Zheng, Rui Chen, Eric Faraci, Zaka Ullah Zahid, Matthew Senesky, Dave Anderson, Jih-sheng Lai, Wensong Yu, Chien-yu LinAbstract:In this paper, a contactless charging system for an electric vehicle (EV) battery is proposed. The system is composed of three parts, a high frequency power supply from a full-bridge inverter with frequency modulation, a loosely coupled transformer that utilizes series resonant capacitors for both the primary and secondary windings, and a rectification Output Circuit that uses a full-bridge diode rectifier. With carefully selected compensation network parameters, zero-voltage switching (ZVS) can be ensured for all the primary switches within the full range of an EV battery charging procedure, which allows the use of low on-state resistance power MOSFETs to achieve high frequency operation and system efficiency. The design of loosely coupled transformer is simulated and verified by finite element analysis (FEA) software. A peak efficiency of 96.6% is achieved with a 4 kW prototype with an 8 cm air gap transformer and 156 kHz switching frequency.
Marcus Lira Brandao - One of the best experts on this subject based on the ideXlab platform.
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serotonergic mechanisms of the median raphe nucleus dorsal hippocampus in conditioned fear Output Circuit involves the prefrontal cortex and amygdala
Behavioural Brain Research, 2009Co-Authors: Rafael Carvalho Almada, Karina Genaro Borelli, Lucas Albrechetsouza, Marcus Lira BrandaoAbstract:Abstract Independent studies have shown that the median raphe nucleus (MRN) and dorsal hippocampus (DH) are involved in the expression of contextual conditioned fear (CFC). However, studies that examine the integrated involvement of serotonergic mechanisms of the MRN–DH are lacking. To address this issue, a CFC paradigm was used to test whether the serotonergic projections from the MRN to DH can influence CFC. Serotoninergic drugs were infused either into the MRN or DH prior to testing sessions in which freezing and startle responses were measured in the same context where 6 h previously rats received footshocks. A reduction of serotonin (5-HT) transmission in the MRN by local infusions of the 5-HT 1A agonist 8-hydroxy-2-(di- n -propylamino)-tetralin (8-OH-DPAT) decreased freezing in response to the context but did not reduce fear-potentiated startle. This pattern of results is consistent with the hypothesis that MRN serotonergic mechanisms selectively modulate the freezing response to the aversive context. As for the DH, a decrease in postsynaptic 5-HT receptor activity at projection areas has been proposed to be the main consequence of 5-HT 1A receptor activation in the MRN. Intra-DH injections of 8-OH-DPAT inhibited both the freezing and fear-potentiated startle response to the context. To reconcile these findings, an inhibitory mechanism may exist between the incoming 5-HT pathway from the MRN to DH and the neurons of the DH Output to other structures. The DH–amygdala or medial prefrontal cortex projections could well be this Output Circuit modulating the expression of CFC as revealed by measurements of Fos immunoreactivity in these areas.
Shinya Ohara - One of the best experts on this subject based on the ideXlab platform.
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local Circuits of layer vb to va neurons mediate hippocampal cortical Outputs in lateral but not in medial entorhinal cortex
bioRxiv, 2020Co-Authors: Shinya Ohara, Stefan Blankvoort, Rajeevkumar R Nair, Maximiliano Jose Nigro, Eirik Stamland Nilssen, Clifford Kentros, Menno P. WitterAbstract:The entorhinal cortex, in particular neurons in layer V, allegedly mediate transfer of information between the hippocampus and the neocortex, underlying long-term memory. Recently, this Circuit has been shown to comprise a hippocampal Output recipient layer Vb and a cortical projecting layer Va. With the use of in vitro electrophysiology in transgenic mice specific for layer Vb, we assessed the presence of the thus necessary connection between layer Vb and layer Va in the two functionally distinct medial (MEC) and lateral (LEC) subdivisions; MEC processes allocentric spatial information, whereas LEC represents the content of episodes. Using identical experimental approaches, we show that in LEC, but not in MEC, layer Vb neurons provide substantial direct input to layer Va neurons. This indicates that the hippocampal-cortex Output Circuit is present only in LEC, suggesting that episodic systems consolidation predominantly uses LEC-derived information and not allocentric spatial information from MEC.
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intrinsic projections of layer vb neurons to layers va iii and ii in the lateral and medial entorhinal cortex of the rat
Cell Reports, 2018Co-Authors: Shinya Ohara, Mariko Onodera, Øyvind W. Simonsen, Rintaro Yoshino, Hiroyuki Hioki, Toshio Iijima, Ken-ichiro Tsutsui, Menno P. WitterAbstract:Summary Layer V of the entorhinal cortex (EC) receives input from the hippocampus and originates main entorhinal Outputs. The deep-sublayer Vb, immunopositive for the transcription factor Ctip2, is thought to be the main recipient of hippocampal projections, whereas the superficial-sublayer LVa, immunonegative for Ctip2, originates the main Outputs of EC. This disrupts the proposed role of EC as mediating hippocampal-cortical interactions. With the use of specific (trans)synaptic tracing approaches, we report that, in medial entorhinal cortex, layer Vb neurons innervate neurons in layers Va, II, and III. A similar Circuitry exists in the lateral entorhinal cortex. We conclude that EC-layer Vb neurons mediate two Circuits in the hippocampus-memory system: (1) a hippocampal Output Circuit to telencephalic areas by projecting to layer Va and (2) a feedback projection, sending information back to the EC-hippocampal loop via neurons in layers II and III.
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Intrinsic Projections of Layer Vb Neurons to Layers Va, III, and II in the Lateral and Medial Entorhinal Cortex of the Rat
Elsevier, 2018Co-Authors: Shinya Ohara, Mariko Onodera, Øyvind W. Simonsen, Rintaro Yoshino, Hiroyuki Hioki, Toshio Iijima, Ken-ichiro Tsutsui, Menno P. WitterAbstract:Summary: Layer V of the entorhinal cortex (EC) receives input from the hippocampus and originates main entorhinal Outputs. The deep-sublayer Vb, immunopositive for the transcription factor Ctip2, is thought to be the main recipient of hippocampal projections, whereas the superficial-sublayer LVa, immunonegative for Ctip2, originates the main Outputs of EC. This disrupts the proposed role of EC as mediating hippocampal-cortical interactions. With the use of specific (trans)synaptic tracing approaches, we report that, in medial entorhinal cortex, layer Vb neurons innervate neurons in layers Va, II, and III. A similar Circuitry exists in the lateral entorhinal cortex. We conclude that EC-layer Vb neurons mediate two Circuits in the hippocampus-memory system: (1) a hippocampal Output Circuit to telencephalic areas by projecting to layer Va and (2) a feedback projection, sending information back to the EC-hippocampal loop via neurons in layers II and III. : Ohara et al. demonstrate the intrinsic connectivity of layer Vb neurons of both the medial and lateral entorhinal cortex. Layer Vb neurons are key elements of two Circuits in the hippocampus-memory system: a hippocampal-Output Circuit and a feedback loop to the hippocampus. Keywords: parahippocampus, rodent, interlaminar connectivity, hippocampal-entorhinal connections, hippocampal-cortical connection
Menno P. Witter - One of the best experts on this subject based on the ideXlab platform.
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local Circuits of layer vb to va neurons mediate hippocampal cortical Outputs in lateral but not in medial entorhinal cortex
bioRxiv, 2020Co-Authors: Shinya Ohara, Stefan Blankvoort, Rajeevkumar R Nair, Maximiliano Jose Nigro, Eirik Stamland Nilssen, Clifford Kentros, Menno P. WitterAbstract:The entorhinal cortex, in particular neurons in layer V, allegedly mediate transfer of information between the hippocampus and the neocortex, underlying long-term memory. Recently, this Circuit has been shown to comprise a hippocampal Output recipient layer Vb and a cortical projecting layer Va. With the use of in vitro electrophysiology in transgenic mice specific for layer Vb, we assessed the presence of the thus necessary connection between layer Vb and layer Va in the two functionally distinct medial (MEC) and lateral (LEC) subdivisions; MEC processes allocentric spatial information, whereas LEC represents the content of episodes. Using identical experimental approaches, we show that in LEC, but not in MEC, layer Vb neurons provide substantial direct input to layer Va neurons. This indicates that the hippocampal-cortex Output Circuit is present only in LEC, suggesting that episodic systems consolidation predominantly uses LEC-derived information and not allocentric spatial information from MEC.
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intrinsic projections of layer vb neurons to layers va iii and ii in the lateral and medial entorhinal cortex of the rat
Cell Reports, 2018Co-Authors: Shinya Ohara, Mariko Onodera, Øyvind W. Simonsen, Rintaro Yoshino, Hiroyuki Hioki, Toshio Iijima, Ken-ichiro Tsutsui, Menno P. WitterAbstract:Summary Layer V of the entorhinal cortex (EC) receives input from the hippocampus and originates main entorhinal Outputs. The deep-sublayer Vb, immunopositive for the transcription factor Ctip2, is thought to be the main recipient of hippocampal projections, whereas the superficial-sublayer LVa, immunonegative for Ctip2, originates the main Outputs of EC. This disrupts the proposed role of EC as mediating hippocampal-cortical interactions. With the use of specific (trans)synaptic tracing approaches, we report that, in medial entorhinal cortex, layer Vb neurons innervate neurons in layers Va, II, and III. A similar Circuitry exists in the lateral entorhinal cortex. We conclude that EC-layer Vb neurons mediate two Circuits in the hippocampus-memory system: (1) a hippocampal Output Circuit to telencephalic areas by projecting to layer Va and (2) a feedback projection, sending information back to the EC-hippocampal loop via neurons in layers II and III.
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Intrinsic Projections of Layer Vb Neurons to Layers Va, III, and II in the Lateral and Medial Entorhinal Cortex of the Rat
Elsevier, 2018Co-Authors: Shinya Ohara, Mariko Onodera, Øyvind W. Simonsen, Rintaro Yoshino, Hiroyuki Hioki, Toshio Iijima, Ken-ichiro Tsutsui, Menno P. WitterAbstract:Summary: Layer V of the entorhinal cortex (EC) receives input from the hippocampus and originates main entorhinal Outputs. The deep-sublayer Vb, immunopositive for the transcription factor Ctip2, is thought to be the main recipient of hippocampal projections, whereas the superficial-sublayer LVa, immunonegative for Ctip2, originates the main Outputs of EC. This disrupts the proposed role of EC as mediating hippocampal-cortical interactions. With the use of specific (trans)synaptic tracing approaches, we report that, in medial entorhinal cortex, layer Vb neurons innervate neurons in layers Va, II, and III. A similar Circuitry exists in the lateral entorhinal cortex. We conclude that EC-layer Vb neurons mediate two Circuits in the hippocampus-memory system: (1) a hippocampal Output Circuit to telencephalic areas by projecting to layer Va and (2) a feedback projection, sending information back to the EC-hippocampal loop via neurons in layers II and III. : Ohara et al. demonstrate the intrinsic connectivity of layer Vb neurons of both the medial and lateral entorhinal cortex. Layer Vb neurons are key elements of two Circuits in the hippocampus-memory system: a hippocampal-Output Circuit and a feedback loop to the hippocampus. Keywords: parahippocampus, rodent, interlaminar connectivity, hippocampal-entorhinal connections, hippocampal-cortical connection
