Topic
Topology (electrical circuits)
About: Topology (electrical circuits) is a research topic. Over the lifetime, 33316 publications have been published within this topic receiving 397651 citations. The topic is also known as: topology.
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TL;DR: A seven-level inverter is proposed, which can synthesize seven levels containing a single dc source and can further generate more levels by a cascaded extension, and the capacitor voltage is self-balanced without utilizing the complicated control strategy and additional control circuits.
Abstract: Based on the switched-capacitor (SC) principle, a seven-level inverter is proposed, which can synthesize seven levels containing a single dc source. Moreover, it can further generate more levels by a cascaded extension. Meanwhile, the proposed topology does not require any sensor due to the use of SC technology. Furthermore, the capacitor voltage is self-balanced without utilizing the complicated control strategy and additional control circuits. The phase disposition pulsewidth modulation is adopted to reduce the total harmonic distortion. The topology can generate different levels with a wide range of modulation index. In addition, the topology can also work in overmodulation. Compared with the traditional SC multilevel inverter, the absence of H-bridge makes low-voltage stress in proposed topology. The voltage stress of all switches is not more than the input voltage. Operational principles, modulation strategy, and voltage stress analysis are discussed. Simulation and experiment are conducted in low power to verify the feasibility of the proposed topology.
114 citations
TL;DR: In this paper, a numerical approach of topology optimization under multiple load cases for heat conduction problem is presented, which is based on the theories of topological derivative and shape derivative for elliptic system.
114 citations
TL;DR: It is concluded that the multilevel topology provides benefits compared with the conventional two-level DAB converter and the capacitor voltage balancing can be guaranteed for all operating conditions.
Abstract: Aiming to improve the performance features of conventional two-level dual-active-bridge (DAB) converters, this paper presents a three-level neutral-point-clamped (NPC) DAB dc–dc converter. A general modulation pattern is initially defined, the dc-link capacitor voltage balancing is analyzed in detail, and a proper balancing control is designed. Then, a set of decoupled optimization problems is formulated as a function of the available modulation degrees of freedom to minimize the predominant converter losses. Finally, a simple and practical specific modulation strategy is provided, resembling the optimum solutions. The good performance of the proposed three-level NPC DAB converter operated with the proposed modulation strategy and voltage balancing control is verified through simulation and experiments. The capacitor voltage balancing can be guaranteed for all operating conditions. In addition, it is concluded that the multilevel topology provides benefits compared with the conventional two-level DAB converter.
114 citations
TL;DR: It is shown that even when the nodes have complete information about the network, the steady-state topologies are suboptimal, and a modified algorithm is proposed based on a better response dynamic that is guaranteed to converge to energy-efficient and connected topologies.
Abstract: The problem of topology control is to assign per-node transmission power such that the resulting topology is energy efficient and satisfies certain global properties such as connectivity. The conventional approach to achieve these objectives is based on the fundamental assumption that nodes are socially responsible. We examine the following question: if nodes behave in a selfish manner, how does it impact the overall connectivity and energy consumption in the resulting topologies? We pose the above problem as a noncooperative game and use game-theoretic analysis to address it. We study Nash equilibrium properties of the topology control game and evaluate the efficiency of the induced topology when nodes employ a greedy best response algorithm. We show that even when the nodes have complete information about the network, the steady-state topologies are suboptimal. We propose a modified algorithm based on a better response dynamic and show that this algorithm is guaranteed to converge to energy-efficient and connected topologies. Moreover, the node transmit power levels are more evenly distributed, and the network performance is comparable to that obtained from centralized algorithms.
114 citations
Patent•
21 Dec 2004
TL;DR: In this paper, the passive scanner analyzes information from the sniffed packets to build a topology of network devices and services that are active on the network and then analyzes the information to detect vulnerabilities.
Abstract: Systems and methods to passively scan a network are disclosed herein. The passive scanner sniffs a plurality of packets traveling across the network. The passive scanner analyzes information from the sniffed packets to build a topology of network devices and services that are active on the network. In addition, the passive scanner analyzes the information to detect vulnerabilities in network devices and services. Finally, the passive scanner prepares a report containing the detected vulnerabilities and the topology when it observes a minimum number of sessions. Because the passive scanner operates passively, it may operate continuously without burdening the network. Similarly, it also may obtain information regarding client-side and server side vulnerabilities.
114 citations