Dehong Xu
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View article: Place Cells as Multi-Scale Position Embeddings: Random Walk Transition Kernels for Path Planning
Place Cells as Multi-Scale Position Embeddings: Random Walk Transition Kernels for Path Planning Open
The hippocampus supports spatial navigation by encoding cognitive maps through collective place cell activity. We model the place cell population as non-negative spatial embeddings derived from the spectral decomposition of multi-step rand…
View article: A minimalistic representation model for head direction system
A minimalistic representation model for head direction system Open
We present a minimalistic representation model for the head direction (HD) system, aiming to learn a high-dimensional representation of head direction that captures essential properties of HD cells. Our model is a representation of rotatio…
View article: On Conformal Isometry of Grid Cells: Learning Distance-Preserving Position Embedding
On Conformal Isometry of Grid Cells: Learning Distance-Preserving Position Embedding Open
This paper investigates the conformal isometry hypothesis as a potential explanation for the hexagonal periodic patterns in grid cell response maps. We posit that grid cell activities form a high-dimensional vector in neural space, encodin…
View article: Emergence of Grid-like Representations by Training Recurrent Networks with Conformal Normalization
Emergence of Grid-like Representations by Training Recurrent Networks with Conformal Normalization Open
Grid cells in the entorhinal cortex of mammalian brains exhibit striking hexagon grid firing patterns in their response maps as the animal (e.g., a rat) navigates in a 2D open environment. In this paper, we study the emergence of the hexag…
View article: Guest Editorial: Special Issue on Emerging Topics of High-Frequency High-Power Density DC–AC Conversion Technologies
Guest Editorial: Special Issue on Emerging Topics of High-Frequency High-Power Density DC–AC Conversion Technologies Open
Recently, high-performance inverters are widely adopted in many applications such as photovoltaic (PV) systems, plasma generation, medical imaging, wireless power transfer, electric vehicle, and so on. For these applications, small volume,…
View article: Stability evaluation of a grid-tied hybrid wind/PV farm joined with a hybrid energy-storage system
Stability evaluation of a grid-tied hybrid wind/PV farm joined with a hybrid energy-storage system Open
This paper presents the stability-evaluation outcomes of a multimachine power system (MMPS) connected with a large-scale hybrid wind farm (WF) and photovoltaic (PV) farm or hybrid wind/PV farm (HWPF) and a hybrid energy-storage system (HES…
View article: Conformal Isometry of Lie Group Representation in Recurrent Network of Grid Cells
Conformal Isometry of Lie Group Representation in Recurrent Network of Grid Cells Open
The activity of the grid cell population in the medial entorhinal cortex (MEC) of the mammalian brain forms a vector representation of the self-position of the animal. Recurrent neural networks have been proposed to explain the properties …
View article: Design of Low Inductance SiC-MOS/Si-IGBT Hybrid Module for PV Inverters
Design of Low Inductance SiC-MOS/Si-IGBT Hybrid Module for PV Inverters Open
In this paper, design of a low parasitic inductance T-type SiC-MOS/Si-IGBT hybrid module for PV inverters is studied. Current commutation loops and self- and mutual inductances model of the hybrid module are analyzed. Then stacked substrat…
View article: A Fixed Frequency Zero-Voltage-Switching On-Board EV Charger
A Fixed Frequency Zero-Voltage-Switching On-Board EV Charger Open
For electric vehicle (EV) onboard charging, high efficiency and power density of the charger is required. Soft switching technique is an effective way to increase On-Board Charger (OBC) power density and efficiency. This paper presents a f…
View article: Analytical Calculation of the Residual ZVS Losses of TCM-Operated Single-Phase PFC Rectifiers
Analytical Calculation of the Residual ZVS Losses of TCM-Operated Single-Phase PFC Rectifiers Open
Triangular-current-mode (TCM) modulation guarantees zero-voltage-switching across the mains cycle in AC-DC power converters, eliminating hard-switching with a minor penalty in conduction losses over the conventional continuous current mod…
View article: An Optimization Design for Transformer and Output Filter of a Micro-inverter with Passive Integration Technique
An Optimization Design for Transformer and Output Filter of a Micro-inverter with Passive Integration Technique Open
The transformer and output filter of the micro-inverter usually have a considerable footprint in the total system. In order to improve the power density of a micro-inverter, an integrated structure of passive components including transform…
View article: A General Pulse Width Modulation Method for Zero-Voltage-Switching Active-clamping Three-phase Power Converters: Edge Aligned Pulse Width Modulation (EA-PWM)
A General Pulse Width Modulation Method for Zero-Voltage-Switching Active-clamping Three-phase Power Converters: Edge Aligned Pulse Width Modulation (EA-PWM) Open
A general PWM method for soft-switching three-phase power converters-Edge Aligned PWM (EA-PWM) is proposed. It aligns all the high loss commutation instants of the converter bridges in a switching cycle at the same instant so that all the …
View article: Novel ZVS S-TCM Modulation of Three-Phase AC/DC Converters
Novel ZVS S-TCM Modulation of Three-Phase AC/DC Converters Open
For three-phase AC-DC power conversion, the widely-used continuous current mode (CCM) modulation scheme results in relatively high semiconductor losses from hard-switching each device during half of the mains cycle. Triangular current mode…
View article: The Operation of the “Chang’an” China-Europe freight Trains Based on Competitiveness
The Operation of the “Chang’an” China-Europe freight Trains Based on Competitiveness Open
Many international railway transport lines from China to Europe have been established with the further implementation of “Belt and Roadâ€, such as “Chongqing-Xinjiang-Europe international railwayâ€, “Chang’an international railwa…
View article: Soft-switching SiC power electronic conversion for distributed energy resources and storage applications
Soft-switching SiC power electronic conversion for distributed energy resources and storage applications Open
Power electronic conversion plays an important role in flexible AC or DC transmission and distribution systems, integration of renewable energy resources, and energy storage systems to enhance efficiency, controllability, stability, and re…
View article: Special Section on Resonant and Soft-Switching Techniques With Wide Bandgap Devices
Special Section on Resonant and Soft-Switching Techniques With Wide Bandgap Devices Open
The development of wide bandgap (WBG) devices in recent years, such as silicon carbide (SiC) and gallium nitride (GaN) power devices, has resulted in power converters with power densities and efficiencies that are not possible with traditi…
View article: Fast Fault Protection Based on Direction of Fault Current for the High-Surety Power-Supply System
Fast Fault Protection Based on Direction of Fault Current for the High-Surety Power-Supply System Open
The high-surety power-supply system, super uninterruptable power supply (Super-UPS), is an evolution of the traditional uninterruptible power supply. It consists of multiple sources, multiple energy storages, and redundant power converters…
View article: General Control Scheme for a Dual-Input Three-Level Inverter
General Control Scheme for a Dual-Input Three-Level Inverter Open
This paper proposes a general control scheme for the dual-input three-level inverter, which comes from a neutral point clamped three-level inverter. It can be used for photovoltaic (PV) systems or battery storage systems with two dc source…