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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Patent•
05 Aug 2004TL;DR: In this paper, a semiconductor integrated circuit device is connected to an external reference resistor, including an impedance control circuit for generating impedance control codes variable with impedances established by the external resistor.
Abstract: A semiconductor integrated circuit device is connected to an external reference resistor, including an impedance control circuit for generating impedance control codes variable with impedances established by the external reference resistor. An input circuit receives an external signal through an input transfer line and forwards the external signal to an internal circuit. A termination circuit terminates the input transfer line in response to at least one of the impedance control code. An output circuit drives an output transfer line in accordance with an output signal. Impedance is variable with the control codes.
81 citations
Patent•
04 Dec 2009TL;DR: In this paper, a non-contact power transmission apparatus with an AC power source and a resonant system is described, and a variable-impedance circuit is constructed to adjust its own impedance in accordance with the state of the system detected by the state detection unit, in such a way that the input impedance and the output impedance at the resonant frequency are matching.
Abstract: Disclosed is a non-contact power transmission apparatus provided with an AC power source and a resonant system. The resonant system has a primary coil that is connected with the AC power source, a primary-side resonance coil, a secondary-side resonance coil, a secondary coil and a load that is connected with the secondary coil. In addition, the non-contact power transmission apparatus is provided with a state detection unit and a variable-impedance circuit. The state detection unit detects the state of the resonant system. The variable-impedance circuit is constructed so as to adjust its own impedance in accordance with the state of the resonant system detected by the state detection unit, in such a way that the input impedance and the output impedance at the resonant frequency of the resonant system are matching.
80 citations
09 Mar 2012
TL;DR: In this article, the output impedance of three-phase voltage-source converters (VSCs) used as inverters for grid integration of renewable energy and energy storage devices is modeled by a positive-sequence and a negative-sequence output impedance.
Abstract: This paper presents techniques to shape the output impedance of three-phase voltage-source converters (VSC) used as inverters for grid integration of renewable energy and energy storage devices. The objective is to avoid harmonic resonance and other unintended interactions between the inverter and the grid impedance. For this purpose, the inverter is modeled by a positive-sequence and a negative-sequence output impedance. Shaping of the inverter output impedance is achieved through changes to various inverter control functions, including grid synchronization and current control. The trade-off between grid compatibility and inverter control performance is also discussed. Experimental results from a multi-converter system test-bed are presented to validate the analyses.
80 citations
TL;DR: In this paper, the authors presented the modeling and analysis of small-signal input impedance for line-commutated rectifiers, and derived closed-form analytical expressions for the ac input impedance as functions of the dc circuit impedance, which is intended for stability analysis and design of large ac power systems involving significant number of rectification loads, such as more-electric aircraft power systems and microgrids.
Abstract: This paper presents the modeling and analysis of small-signal input impedance for line-commutated rectifiers. The recently developed impedance mapping method, which has been applied to single-phase rectifiers with sinusoidal line inputs, is generalized to single-phase rectifiers with distorted lines as well as three-phase rectifiers. The modeling method assumes known impedance of the circuit on the dc side of the rectifier bridge (including its output filter and the load), and determines the corresponding ac input impedance by using a current and voltage mapping function that describes the operation of the rectifier bridge in the frequency domain. In this approach, closed-form analytical expressions are derived for the ac input impedance as functions of the dc circuit impedance. The resulting models are intended for stability analysis and design of large ac power systems involving significant number of rectification loads, such as more-electric aircraft power systems and microgrids. Detailed derivation of the models is presented in this paper. Numerical simulation and experimental measurement results are also presented to validate the developed models.
80 citations
29 Oct 2001
TL;DR: This paper proposes one approach with a 2-impedance model, which has one shunt impedance and one series impedance and can be used with more complicated structures than the single impedance model.
Abstract: In general, three parameters are needed to model symmetrical adapters, but not enough equations can be found to solve them. The measurement of through adapters gives two conditions only, but neither open nor short adapter gives any useful condition. The results from lines with length L and length 2L can be used to derive the result for through adapters. This paper proposes one approach with a 2-impedance model, which has one shunt impedance and one series impedance. This model can be used with more complicated structures than the single impedance model.
80 citations