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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01 Feb 1980
TL;DR: In this article, it is shown that a necessary and sufficient condition for a transistor network to possess more than one solution to its dc equations, for some choice of network parameter values, is that a certain simple set of connections, involving some pair of transistors, is present in the circuit's topological structure.
Abstract: It is shown that a necessary and sufficient condition for a transistor network to possess more than one solution to its dc equations, for some choice of network parameter values, is that a certain simple set of connections, involving some pair of transistors, is present in the circuit's topological structure The presence of this set of connections, prescribing the presence of a certain special two-transistor substructure, referred to as a feedback structure, is thus a necessary condition that any transistor network must satisfy in order to possess the property of bistability The proof of this result is based upon a consideration of two topological properties of transistor networks possessing unique solutions to their dc equations In addition, it is shown how the amount of computation required to verify a certain well-known set of necessary and sufficient conditions which guarantees the uniqueness of solutions to the dc equations of transistor networks can be reduced by determining the location of all feedback structures
113 citations
TL;DR: A power-efficient frequency compensation topology, Impedance Adapting Compensation (IAC), is presented, which has a normal Miller capacitor still needed to provide an internal negative feedback loop and a serial RC impedance as a load to the intermediate stage, improving performance parameters such as stability, gain-bandwidth product and power dissipation.
Abstract: A power-efficient frequency compensation topology, Impedance Adapting Compensation (IAC), is presented in this paper. This IAC topology has, on one hand, a normal Miller capacitor, which is still needed to provide an internal negative feedback loop, and on the other hand, a serial RC impedance as a load to the intermediate stage, improving performance parameters such as stability, gain-bandwidth product and power dissipation. A three-stage IAC amplifier was implemented and fabricated in a 0.35 μm CMOS technology. Experiment results show that the implemented IAC amplifier, driving a 150 pF load capacitance, achieved a gain-bandwidth product (GBW) of 4.4 MHz while dissipating only 30 μW power with a 1.5 V supply.
113 citations
12 Dec 2011
TL;DR: In this article, general design criteria are described for efficient power transfer in a CPT system and the need for compensation has been discussed and general conditions for achieving bifurcation-free operation for each compensation topology have been derived.
Abstract: Contactless power transfer (CPT) is a safe, convenient and reliable way of transferring power in many applications where there exists no physical contact between the source and the load. In this paper, general design criteria are described for efficient power transfer in a CPT system. The need for compensation has been discussed and general conditions for achieving bifurcation-free operation for each compensation topologies have been derived. Advantages of using Series-Series compensated topology over other topologies are discussed. Constant current and constant voltage modes of operation of Series-Series topology and conditions for these modes of operation are presented. An experimental CPT setup is built to validate the theory developed.
113 citations
TL;DR: In this paper, a novel converter topology of high-voltage direct current (HVDC) transmission for integrating the offshore wind farm (WF) with the grid is proposed, which consists of a series connection of the 12-pulse diode rectifiers and a voltage-source converter (VSC).
Abstract: In this letter, a novel converter topology of high-voltage direct current (HVDC) transmission for integrating the offshore wind farm (WF) with the grid is proposed, which consists of a series connection of the 12-pulse diode rectifiers and a voltage-source converter (VSC). For this topology, the PCC (point of common coupling) voltage of the offshore WF side is regulated at a constant magnitude and constant frequency by the WFVSC. Also, the current at the PCC becomes almost sinusoidal since the WFVSC functions as an active power filter for the 11th- and 13th-order harmonic current components. By virtue of the diode rectifier, the cost and power loss of HVDC converters is reduced compared with the case of the conventional fully rated VSC, whereas the performance is kept almost the same. The PSCAD/EMTDC simulation results for a 500-MW HVDC transmission system have been shown to verify the validity of the proposed scheme.
112 citations
TL;DR: In this paper, the authors proposed a seven-switch 5L-ANPC (7S-5L -ANPC) topology, which employs only seven active switches and two discrete diodes.
Abstract: Multilevel inverters are receiving more attentions nowadays as one of preferred solutions for medium- and high-power applications. As one of the most popular hybrid multilevel inverter topologies, the five-level active-neutral-point-clamped inverter (5L-ANPC) combines the features of the conventional flying-capacitor type and neutral-point-clamped (NPC) type inverter and was commercially used for industrial applications. In order to further decrease the number of active switches, this paper proposes a seven-switch 5L-ANPC (7S-5L-ANPC) topology, which employs only seven active switches and two discrete diodes. The analysis has shown a lower current rating can be selected for the seventh switch under high power factor condition, which is verified by simulation results. The modulation strategy for 7S-5L-ANPC inverter is discussed. A 1 kVA single-phase experimental prototype is built to verify the validity and flexibility of the proposed topology and modulation method.
112 citations