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 article, the authors proposed practical and simple methods, which involve applying current or voltage perturbation to the dc side of distributed power systems then only measuring the amplitude of two currents or voltages in order to monitor the stability margin.
Abstract: In multi-module power electronics systems, especially DC distributed power systems, the small-signal stability issues are often dealt with by employing Middlebrook's impedance criterion. However, for on-line system stability margin monitoring, directly measuring impedance of the source and load subsystems then making quantitative comparisons is too complicated and difficult. This paper proposes practical and simple methods, which involve applying current or voltage perturbation to the dc side of distributed power systems then only measuring the amplitude of two currents or voltages in order to monitor the stability margin. For both methods (current perturbation and voltage perturbation), an implementation approach that does not employ external voltage or current perturbation source is also presented. All these methods and approaches are equivalent to the impedance measuring and comparing method based on the impedance criterion with different forbidden regions. A comparative evaluation of each method and its corresponding implementation approach is provided.
127 citations
Patent•
25 Jun 1973
TL;DR: In this article, a constant magnitude alternating current source is connected to at least one electrical impedance to be measured, and a computer is attached to the first and second voltage detectors for processing the measured voltage to compute desired characteristics of the electrical impedance.
Abstract: There is disclosed a constant magnitude alternating current source connected to at least one electrical impedance to be measured. First and second voltage detectors are connected to the electrical impedance to measure voltage across first and second portions of the electrical impedance, respectively, in response to the current conducted from the current source. A computer is attached to the first and second voltage detectors for processing the measured voltage to compute desired characteristics of the electrical impedance.
127 citations
TL;DR: The theoretical analysis is instrumental in designing an optimally stable single dc bus EPS and provides a stability analysis based on the derivation of the output impedance of the source subsystem and input impedance ofThe load subsystem, including control dynamics.
Abstract: This paper focuses on the analysis of a single dc bus multigenerator electrical power system (EPS) for future more electric aircraft. Within such a single bus paradigm, the paper proposes a detailed control design procedure and provides a stability analysis based on the derivation of the output impedance of the source subsystem and input impedance of the load subsystem, including control dynamics. The single bus characteristic is analyzed and the stability properties of the EPS are investigated when supplying constant power loads. In addition, the paper highlights the impact on stability of the number of parallel sources and of the power sharing ratio. The theoretical analysis is instrumental in designing an optimally stable single dc bus EPS. The key findings are validated by experimental results.
127 citations
TL;DR: In this paper, a split-phase control scheme was proposed to enable the Dickson converter to achieve complete soft-charging (or resonant) operation, which is not possible using the conventional two-phase controller.
Abstract: Switched-capacitor (SC) converters are gaining popularity due to their high power density and suitability for on-chip integration. Soft-charging and resonant techniques can be used to eliminate the current transient during the switching instances, and improve the power density and efficiency of SC converters. In this paper, we propose a split-phase control scheme that enables the Dickson converter to achieve complete soft-charging (or resonant) operation, which is not possible using the conventional two-phase control. An analytical method is extended to help in the analysis and design of split-phase controlled Dickson converters. The proposed technique and analysis are verified by both simulation and experimental results. An 8-to-1 step-down Dickson converter with an input voltage of 150 V and rated power of 36 W is built using GaN FETs. The converter prototype demonstrated a five fold reduction in the output impedance (which corresponds to conduction power loss) compared to a conventional Dickson converter, as a result of the split-phase controlled soft-charging operation.
125 citations
TL;DR: In this article, a 700MHz fully differential class-E CMOS power amplifier for wireless applications has been built toward maximum efficiency, which can deliver 1 W of output power in a 50/spl Omega/output impedance.
Abstract: A 700-MHz fully differential class-E CMOS power amplifier for wireless applications has been built toward maximum efficiency The prototype can deliver 1 W of output power in a 50-/spl Omega/ output impedance The maximum power-added efficiency (PAE) is measured to be 62% The obtained efficiency and output power is compared with the class-E amplifiers theory
125 citations