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.

Single-Phase Step-Up Switched-Capacitor-Based Multilevel Inverter Topology With SHEPWM

Abstract: Multilevel inverter (MLI) topologies play a crucial role in the dc–ac power conversion due to their high-quality performance and efficiency. This article aims to propose a new switched-capacitor-based boost multilevel inverter topology (SCMLI). The proposed topology consists of nine power semiconductor switches with one dc voltage source and two capacitors, capable of generating a nine-level output voltage waveform with twice voltage gain. With the addition of two switches, the proposed topology can be used for higher voltage-gain applications. Other features of the proposed topology include the self-voltage balancing of the capacitors, parallel operation of the capacitors, lower voltage stress across the switches, along with the inherent polarity changing capability. To obtain the high-quality output waveform, a selective harmonic elimination pulsewidth modulation technique is applied. In this technique, the detrimental low-order harmonics can easily be regulated and eliminated from the output voltage of MLI. The proposed topology is compared with the recently introduced SCMLI topologies considering various parameters to set the benchmark of the proposed topology. The performance of the proposed MLI is investigated through various experimental results using a laboratory prototype setup.

Topology Selection and Efficiency Improvement of Inductive Power Links

Abstract: The problem of choosing the right topology for a wireless power transfer (WPT) application to maximize power transfer efficiency has been presented and addressed in this work. We analyze the series and parallel resonant topologies used in inductively coupled links, derive the efficiency expressions and verify them experimentally using planar inductors built on a PCB. We compare and contrast the two topologies and arrive at the frequency boundary that separates them. The results are verified experimentally and corroborated using simulation results from HFSS. We also address the misconception in the context of resonant tuning both qualitatively and quantitatively. Based on the analysis, we then provide the procedure to obtain the maximum power transfer efficiency for a given pair of coil across all frequencies, loads and topologies by proper selection of load, topology and the frequency of operation. The method is presented using an example pair of coils simulated in HFSS and the results agree well with the theoretical results.

Controllability of multi-agent systems with time-delay in state and switching topology

Abstract: In this article, the controllability issue is addressed for an interconnected system of multiple agents. The network associated with the system is of the leader–follower structure with some agents taking leader role and others being followers interconnected via the neighbour-based rule. Sufficient conditions are derived for the controllability of multi-agent systems with time-delay in state, as well as a graph-based uncontrollability topology structure is revealed. Both single and double integrator dynamics are considered. For switching topology, two algebraic necessary and sufficient conditions are derived for the controllability of multi-agent systems. Several examples are also presented to illustrate how to control the system to shape into the desired configurations.

High efficiency converter with charge pump and coupled inductor for wide input photovoltaic AC module applications

Abstract: Existing photovoltaic (PV) panels have widely varying input voltages based on the panel configuration and size. In this paper, a novel topology with a single active switch — combining boost, flyback, and charge-pump circuits — is proposed in order to achieve wide input range, high voltage gain, high efficiency, and low cost simultaneously. It meets the input-voltage and power-level needs of the majority of modern PV panels while still being suitable for connection with a highvoltage dc bus. The circuit has been designed, simulated, and implemented with the 20 to 70 V input, 200±20 V output, and 220 W output power as a part of a PV ac module. Experimental results verify the validity of the novel circuit and show 97.4% peak efficiency and greater than 96.3% for 50 to 220 W.

Novel full bridge semicontrolled switch mode rectifier

Abstract: A novel semicontrolled switch mode rectifier (SMR) topology is proposed and analysed. Its advantages when compared with other existing SMR topologies are high true power factor at the AC source (almost unity), high displacement power factor at the input of the SMR unit (almost unity), high efficiency, low implementation cost and high power density.