Topic
Output impedance
About: Output impedance is a research topic. Over the lifetime, 11185 publications have been published within this topic receiving 134949 citations.
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TL;DR: In this paper, a self-powered and highly durable TENG pressure sensor for large-scale pressure detection based on double-side tribological layers of micro-patterned polydimethylsiloxane (PDMS) and PDMS-multi-wall carbon nanotube (CNT) nanocomposites is presented.
112 citations
Patent•
22 Jul 2002
TL;DR: In this paper, a method for monitoring the impedance in a circuit coupling a radio frequency electrode to a generator to control the power supplied by the generator to the electrode during a treatment procedure is presented.
Abstract: A method for monitoring the impedance in a circuit coupling a radio frequency electrode to a radio frequency generator to control the power supplied by the generator to the electrode during a treatment procedure. In the method, the impedance in the circuit is monitored over a length of time. An expected impedance at the end of the treatment procedure is calculated from the monitored impedance and compared to a predetermined maximum impedance. The power supplied to the circuit is reduced if the expected impedance is greater than the predetermined maximum impedance. A computer-readable memory and apparatus utilizing the method are provided.
111 citations
19 Feb 2003
TL;DR: In this paper, a small-signal model of the active droop control method, which is shown to be a two-loop feedback control system, is discussed, in order to achieve equal crossover frequencies for the two loops so that constant output impedance is realized in the voltage regulator.
Abstract: Use of the active droop control method is a popular way to achieve adaptive voltage position (AVP) for the voltage regulator (VR). This paper discusses the small-signal model of the active droop control method, which is shown to be a two-loop feedback control system. The compensator design impacts both the current and voltage loops, making the design complicated. An optimal design method is proposed in order to achieve equal crossover frequencies for the two loops so that constant output impedance is realized in the VR. Simulation and experimental results prove the good VR transient response and high efficiency.
111 citations
07 Sep 2016
110 citations
TL;DR: In this paper, an integrated boost converter approach was proposed to provide ride-through to critical ASD load during voltage sags without any additional energy storage device. But, the performance of the boost converter was not evaluated.
Abstract: In this paper, a critical evaluation of the effect of voltage sags on adjustable-speed drives (ASDs) is presented. In particular, the DC-link voltage variation under voltage sag and its dependence on source impedance, DC-link inductance and output load is computed. It is shown that, for larger source impedance, the DC-link voltage variation under a voltage sag is also large and increases the susceptibility of an ASD and may result in a nuisance trip. The results from the analysis are plotted in per-unit quantities and serve as a design guide to assess ASD performance for a variety of sags. In order to improve the performance of ASDs, this paper proposes an integrated boost converter approach. This approach provides ride-through to critical ASD load during voltage sags without any additional energy storage device. Upon detection of a voltage sag, the boost converter operates with suitable duty ratio and maintains the DC-link voltage within acceptable limits. This prevents nuisance tripping and facilitates continuous operation of critical ASD load at rated torque. The proposed integrated boost converter does not introduce any additional semiconductors in the series path of the power flow and is low in cost. A commercially available 480 V 22 kVA ASD is modified with the integrated boost converter approach, and details are discussed. Analysis, simulation, and experimental performance of the ride-through approach are presented.
109 citations