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Some converters use capacitors efficiently and others use switches efficiently, but none of these converters are superior in both asymptotes. For converters designed using a capacitor-limited process, a series-parallel topology would work best, while switch-limited designs should use a topology such as the Dickson charge pump or ladder topology.
In an application where switches are the limiting factor in performance or cost, switched-capacitor converters are evi-dently advantageous over conventional magnetics-based DC-DC converters at high or moderate conversion ratios.
tion loss) is compared with that of two magnetics-based DC-DC converters. At moderate to high conversion ratios, the switched-capacitor converter has significantly less conduction loss than an inductor-based buck converter. Some aspects of converter implementation are discussed, including t
SSL output impedance (scaled by switching frequency as it does not effectthe minimizatio ) and the second t i C2 λ (vc,i(rated))22i∂L 1= (vc,i(rated))2Ci − Etot , the optimal capacitor energies are proportional to th product of theirrated voltage and their charge mul
However, the switches and capacitors can be rated differently from each other, ie. if the highest-voltage switch is rated for 1 volt, a 1 volt process would be used, even if some capacitors support a higher voltage. The comparison results using identically-rated switches and transistors are shown in fig. 7.
portional to switch area and thus areproportional to switch conductanc . To compensate for parasitic loss, the capacitors must b made larger toallow for a lower switching freq ency and parasitic loss. If the FSL impedance was made lower inste oss would increase as the switch conductances increase.5 Control Methods
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System voltages of electric vehicles (EVs) are increasing from 400 V to 600–800 V to reduce charging time and to extend cruising distance. However, ordinary 500-V charging stations cannot directly be applied to such high voltage EV systems. This paper proposes and analyzes resonant switched capacitor converters (RSCCs) as on-board boost converters with 1-to-l.5 voltage …
T1 - Analysis and Comparison of Notch Filter and Capacitor Voltage Feedforward Active Damping Techniques for LCL Grid-Connected Converters. AU - Rodriguez-Diaz, Enrique. AU - Freijedo, Francisco D. AU - Vasquez, Juan C. AU - Guerrero, Josep M. PY - 2019/4. Y1 - 2019/4
This work develops a generalized output impedance model for switched-capacitor (SC) and hybrid-resonant switched-capacitor dc-dc converters that is scalable across conversion ratios and frequencies. This model builds on previous analytical treatments of SC and ReSC converters, but is expanded to derive optimizations that include both conduction and …
The topology, buck-boost modulation principle, capacitor voltage self-balance analysis, switching behaviors, and comprehensive comparison with the traditional SCDCT are completed in detail. Finally, the experimental results validate the effectiveness and correctness of the proposed solution.
This work develops a generalized output impedance model for switched-capacitor (SC) and hybrid-resonant switched-capacitor dc-dc converters that is scalable across conversion ratios and frequencies. This model builds on previous analytical treatments of SC and ReSC converters, but is expanded to derive optimizations that include both conduction and switching …
This article explores the merits of a variety of hybrid-resonant switched-capacitor dc–dc converters under strict size constraints on passive components (flying capacitors and inductors) and uses a charge-multiplier approach to show the impact of area or volume constraints on inductors and capacitors. This article explores the merits of a variety of hybrid …
An analysis and detailed breakdown is provided for several common and emerging topologies. This paper explores methods to optimize and compare a variety of switched-capacitor (SC) DC-DC topologies that can be operated in a resonant mode. A figure of merit is developed that is a proxy for minimum achievable power loss, based on conduction and ...
tions then permit comparison among the switched-capacitor topologies, and comparisons of SC converters with conven-tional magnetic-based dc-dc converter circuits, in the context of various application settings. The comprehensive analysis and design calculations given here are new, but connect with the analysis framework devel-
An analysis and detailed breakdown is provided for several common and emerging topologies. Keywords—DC-DC Converters, Resonant Converters, Switched Capacitor Circuits, Modelling and Optimization I. INTRODUCTION In recent years, a variety of hybrid, resonant, and soft charged switched capacitor converters have been presented for
This work introduces a digital technique to measure and correct the mismatch between capacitors in SAR ADCs with split capacitor-based DAC (CDAC), including the bridge capacitor impairments. The method takes advantage of redundancy for calibration with negligible impact on the analog section. It reuses some of the capacitors in the array to also compensate the comparison …
This work develops a generalized output impedance model for switched-capacitor (SC) and hybrid-resonant switched-capacitor dc-dc converters that is scalable across conversion ratios and frequencies. This model builds on previous analytical treatments of SC and ReSC converters, but is expanded to derive optimizations that include both conduction and switching loss and help …
This article explores the merits of a variety of hybrid-resonant switched-capacitor (SC) dc-dc converters under strict size constraints on passive components (flying capacitors and inductors). Topologies are compared using a "minimum power loss" figure of merit (FOM) that captures conduction- and frequency-dependent losses in active semiconductor devices and losses …
A detailed analysis of available surface mount discrete components and on-die devices reveals that capacitors have substantially higher energy and power density than their magnetic …
This article explores the merits of a variety of hybrid-resonant switched-capacitor (SC) dc-dc converters under strict size constraints on passive components (flying capacitors and inductors). Topologies are compared using a "minimum power loss" figure of merit (FOM) that captures conduction- and frequency-dependent losses in active semiconductor devices and losses …
Galluim-Nitride(GaN) power devises have a potential to achieve higher efficiency operation than Silicon(Si) ones such as MOS FETs and IGBTs. However, the characteristic of GaN FETs is different from MOS FETs, and thus, there is the possibility that GaN-based power electronics circuits shows more losses than Si-based ones. To resolve this problem, some of the gate …
Abstract—This paper explores methods to optimize and compare a variety of switched-capacitor (SC) DC-DC topologies that can be operated in a resonant mode. A figure of merit is …
The use of filtered capacitor voltage feed-forward mimics the capacitor current for the active damping action, since it is estimated by a derivative calculation (i.e., the capacitor current is estimated from a time derivative of the capacitor voltage) [5], [14]–[16]. On the other hand, notch-filters introduce and
Voltage gaps among charging and discharging levels as well as capacitor voltages exist fundamentally in switched-capacitor (SC) converters.
Analysis methods are developed that fully determine a switched-capacitor (SC) dc-dc converter''s steady-state performance through evaluation of its output impedance. This analysis method has been verified through …
Capacitor is a device that is used to store an electric charge. It is basically an arrangement of conductors. Capacitor stores electrical energy directly as an electrostatic field is created between two metal "plates". A supercapacitor is …
The increasing development of electronic controls has led to a wider use of capacitors each with distinct properties suited to different applications. This article describes the characteristics of different capacitors, including ceramic capacitors, electrolytic capacitors, film …
capacitor converter topologies are compared in the two asymptotic limits. Switched-capacitor converter performance (based on condu tion loss) is compared with that of two magnetics …
This article explores the merits of a variety of hybrid-resonant switched-capacitor (SC) dc-dc converters under strict size constraints on passive components (flying capacitors and inductors).
Recent studies use cascaded H-bridge (CHB) and modular multilevel converters (MMC) for large scale solar photovoltaic (PV) integration to a medium voltage (MV) grid. In these converters, electrolytic capacitors are normally preferred in order to obtain high capacitance in each module. This paper investigates the capacitance requirement of three modular …
Analysis and Comparison of Notch Filter and Capacitor Voltage Feedforward Active Damping Techniques for LCL Grid-Connected Converters ... Experimental tests are provided in order to show the accuracy of the analysis and verify the findings. This paper proves that filtered capacitor voltage feedforward is a more robust and reliable solution than ...
Design and analysis of n-stage switched-capacitor (SC)-based step-up DC/DC regulators using a current control scheme to adjust the charging trajectory of the capacitors are presented.
S. Sünter, M. Özdemir, B. Gümüş: Dynamic analysis and comparison of single-phase induction motor with a switching and double capacitors ENGINEERING MODELLING 15 (2002) 1-4, 51-56 51 SUMMARY In order to get maximum torque in the single-phase induction motor one of the methods is to use a switching capacitor in the auxiliary winding.
Offshore wind farm with an internal medium-voltage dc (MVDC)-grid collection connected HVDC transmission may be an option to harvest offshore wind energy. High-power MV dc/dc converters with high-step-up conversion ratios are the key components for the internal MVDC grid. In this paper, a high-efficiency step-up resonant switched-capacitor converter for offshore wind …
Request PDF | Modeling and Comparison of Passive Component Volume of Hybrid Resonant Switched-Capacitor Converters | Hybrid and resonant switched-capacitor (SC) convertersenable efficient ...
An analysis method has been presented to determine the performance of any switched-capacitor power converter using easily-determined charge multiplier vectors. The capacitors and …
Hybrid and resonant switched-capacitor (SC) convertersenable efficient utilization of both active and passive components, and have the potential to achieve higher efficiency and higher power density than conventional SC and magnetic-based converters. One or more added inductors offer an additional degree of freedom in the design space. It is of great interest to …
Hybrid/Resonant SC Converters Switched Capacitor Stage + Inductor(s) • Leverage high energy density SC network Reduce inductor ∆ Reduce inductor energy storage and size • Inductor eliminate ''charge sharing''in SC stage Higher efficiency (lower cond. loss and sw. frequency) Higher power density (smaller passive component volume, better utilization of semiconductor …
[McLaughlin, et al., "Analysis and Comparison of Hybrid-Resonant Switched-Capacitor DC–DC Converters With Passive Component Size Constraints," TPEL ''21]
System voltages of electric vehicles (EVs) are increasing from 400 V to 600–800 V to reduce charging time and to extend cruising distance. However, ordinary 500-V charging stations cannot directly be applied to such high voltage EV systems. This paper proposes and analyzes resonant switched capacitor converters (RSCCs) as on-board boost converters with …
The initial analysis will consider circuits made up of ideal devices: switches, each with a finite on-state resistance and ideal capacitors. For the basic analysis, the switches have no parasitic capacitances and can be turned on and off arbitrarily with no electrical effort. Also, the capacitors will have no parasitics or series resistance.
Abstract—In this paper we compare two resonant switched capacitor converters in which the resonant inductor can be placed in series with a resonant capacitor (AC side), conducting a …
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