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Decoupling capacitor

About: Decoupling capacitor is a research topic. Over the lifetime, 12282 publications have been published within this topic receiving 141890 citations. The topic is also known as: bypass capacitor.


Papers
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Journal ArticleDOI
TL;DR: Two active capacitor voltage balancing schemes are proposed for single-phase (H-bridge) flying-capacitor multilevel converters that can be utilized to converters with any desired number of levels in their output voltage.
Abstract: Two active capacitor voltage balancing schemes are proposed for single-phase (H-bridge) flying-capacitor multilevel converters. They are based on the circuit equations of flying-capacitor converters. Consequently, they can be implemented using straightforward control rules. In particular, the first technique is based on an algorithm which follows the standard multilevel modulation. Then, it utilizes a redundant state selection table for capacitor voltage balancing. In the second method, multiple duty cycles are defined and modulated in direct response to the capacitor voltages. The most important advantage of these two proposed methods is that they can be utilized to converters with any desired number of levels in their output voltage. Moreover, the analysis and implementation of both methods are straightforward. Through simulation and experimental implementation, these methods are shown to be effective on capacitor voltage regulation in flying-capacitor multilevel converters.

222 citations

Patent
28 May 1999
TL;DR: In this paper, a structure and process for converting DC-DC voltages, which allows both buck and boost conversion utilizing a single switched capacitor array, is provided for converting dc-dc voltages.
Abstract: A structure and process are provided for converting DC-DC voltages, which allows both buck and boost conversion utilizing a single switched capacitor array. In one embodiment of this invention, the switched capacitor array comprises multiple gain blocks, where the gain blocks are identical and stacked upon each other. The switches and capacitors are configured so that various combinations of series and parallel capacitor connections are possible, and thus both buck and boost conversions are attainable with one switched capacitor array. Other embodiments of the present invention use multiple gain blocks, configured such that the capacitor in each gain block can be connected to ground. As a result, a single charge state for a range of desired gains can be configured for use with a shared or common rest state, i.e., a capacitor configuration which is the same regardless of the desired gain. In the charge state, selected capacitors are configured in series for the desired gain setting, while in the shared rest state, all the capacitors are configured in parallel from the output to the input. Because a shared rest state is used, the correct charge is always transferred at the desired gain with a single switched capacitor array.

216 citations

Journal ArticleDOI
TL;DR: In this article, a new deterioration diagnosis method for the electrolytic capacitor is proposed for a forward-type converter and a buck-boost converter, which is valid for any load condition, no matter whether the circuit has feedback control.
Abstract: A new deterioration diagnosis method for the electrolytic capacitor is proposed for a forward-type converter and a buck-boost converter. It was observed that the ESR (equivalent series resistance) of the electrolytic capacitor increases as it deteriorates, and the knowledge that ripple varies proportionally to the ESR increase was used. With this method, the electrolytic capacitor life-cycle aging rate can be projected for the active circuit over the system life. This approach to deterioration is valid for any load condition, no matter whether the circuit has feedback control or not. >

214 citations

Journal ArticleDOI
TL;DR: In this paper, a flyback converter is used to separate the decoupling capacitor from the PV Module, which allows for a high voltage and voltage ripples across its terminals.
Abstract: This paper presents a new microinverter topology that is intended for single-phase grid-connected PV systems. The proposed microinverter topology is based on a flyback converter, where an extra switch is added to separate the decoupling capacitor from the PV Module, which allows for a high voltage and voltage ripples across its terminals. This results in reducing the power decoupling required capacitance. In this manner, long life-time low power density film capacitors can be used instead of life-time limited high power density electrolytic capacitors, resulting in remarkable increase of microinverter's lifespan. The main advantages of the proposed topology are summarized as: 1) eliminating the double-frequency power ripple using a small film capacitor; 2) using long lifetime film capacitors, which will improve the reliability of the inverter; and 3) requiring no additional circuitry to manage the transformer leakage energy. A 100-W microinverter prototype was built to verify the proposed topology. Experimental results show that the proposed topology and its control scheme can realize the power decoupling, while maintaining very good conversion efficiency numbers.

208 citations

Journal ArticleDOI
TL;DR: In this article, the self-discharge of an electrochemical capacitor is characterized by measuring the decline of open-circuit voltage of the electrochemical capacitance, and the mechanisms of selfdischarge, leakage current, and diffusion of ions at the electrode-electrolyte interfaces are modeled by an electrical equivalent circuit.
Abstract: The self-discharge of an electrochemical capacitor, also referred to as a supercapacitor, is an important factor in determining the duration of maintaining stored energy, especially in low-duty-cycle applications. The study of self-discharge is conducted as follows: first, the self-discharge is characterized by measuring the decline of open-circuit voltage of the electrochemical capacitor. Second, the mechanisms of self-discharge, leakage current, and diffusion of ions at the electrode-electrolyte interfaces are modeled by an electrical equivalent circuit. The equivalent circuit elements are experimentally determined according to the self-discharge time behavior. In addition, the dependence of the self-discharge parameters on both temperature and initial voltage across the electrochemical capacitor is described in detail.

204 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202351
2022126
202151
2020111
2019111
2018156