A general method for deriving output resistances of serial fixed type switched-capacitor power supplies

Oota, Ichirou; Hara, Noriaki; Ueno, Fumio

doi:10.1109/iscas.2000.856107

Cited by 35 publications

(16 citation statements)

References 6 publications

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“…This voltage drop is proportional to output current, and can be represented as an output resistance. An idealized model for a two-port SC converter is shown in figure 1.3, as discussed in references [27,35]. The model is made up of an ideal transformer with a turns ratio equal to the no-load conversion ratio, and an output resistance R OU T .…”

Section: Switched-capacitor Converter Structure and Terminologymentioning

confidence: 99%

“…Numerous additional references [8,35,67,34] follow the same approach and use non-general analysis methods to solve their particular problems. Clearly, a more-unified and general analysis approach is needed.…”

Section: Pre-existing Switched-capacitor Converter Analysismentioning

confidence: 99%

“…With the model in figure 1.3, the converter provides an ideal dc voltage conversion ratio under no load conditions, and all conversion losses are manifested by voltage drop associated with non-zero load current through the output impedance [27,35]. The resistive output impedance accounts for capacitor charging and discharging losses and resistive conduction losses.…”

Section: Fundamental Analysis Of Switched-capacitor Convertersmentioning

confidence: 99%

“…The circuit loss is related only to conduction loss in resistive elements. The concept of the FSL impedance is introduced informally in reference [35].…”

Section: Fast-switching Limit Impedancementioning

confidence: 99%

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A Design Methodology for Switched-Capacitor DC-DC Converters

Seeman¹

2009

232

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While they are only capable of a finite number of conversion ratios, SC converters can support a higher power density compared with traditional converters for a given conversion ratio. Finally, through simple control methods, regulation over many magnitudes of output power is possible while maintaining high efficiency.A complete, detailed methodology for SC converter analysis, optimization and implementation is derived. These methods specify device choices and sizing for each capacitor and switch in the circuit, along with the relative sizing between switches and capacitors. This method is advantageous over previously-developed analysis methods because of its simplicity and the intuition it lends towards the design of SC converters. The strengths and weaknesses of numerous topologies are compared amongst themselves and with magnetics-1 based converters. These methods are incorporated into a MATLAB tool for converter design.This design methodology is applied to three varied applications for SC converters. First, a high-voltage hybrid converter for an autonomous micro air vehicle is described. This converter, weighing less than 150mg, creates a supply of 200V from a single lithium-ion cell (3.7V) to supply the aircraft's actuators. Second, a power-management integrated circuit (IC) is presented for a wireless sensor node. This IC, with a target quiescent current of 1 µA, supplies the system voltages of the PicoCube wireless sensor node. Finally, the initial design of a high-current-density SC voltage regulator is presented for low-footprint microprocessor applications.Professor Seth R. Sanders Dissertation Committee Chair 2

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Section: Switched-capacitor Converter Structure and Terminologymentioning

confidence: 99%

Section: Pre-existing Switched-capacitor Converter Analysismentioning

confidence: 99%

Section: Fundamental Analysis Of Switched-capacitor Convertersmentioning

confidence: 99%

“…The circuit loss is related only to conduction loss in resistive elements. The concept of the FSL impedance is introduced informally in reference [35].…”

Section: Fast-switching Limit Impedancementioning

confidence: 99%

See 2 more Smart Citations

A Design Methodology for Switched-Capacitor DC-DC Converters

Seeman¹

2009

232

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show abstract

“…The average behavior of SCC systems was analyzed in numerous earlier studies (e.g. [1][2][3][4][5][6][7][8][9][10]), in which the expressions of the voltage transfer ratios and the expected losses were derived.…”

Section: Introductionmentioning

confidence: 99%

Generic average modeling and simulation of the static and dynamic behavior of Switched Capacitor Converters

Ben‐Yaakov

Evzelman

2012

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-A generic behavioral average circuit model of a Switched Capacitor Converter (SCC) is proposed and verified. The model is based on the average currents concept and assumes that each of the SCC subcircuits can be described or approximated as a first order network. The model can be used to calculate or simulate the average static, dynamic and small signal responses of the SCC. The model is valid for all operational modes of a SCC (complete, partial and no charge) and is compatible with any circuit simulator that includes dependent sources. Excellent agreement was found between the behavior of the proposed average model, full circuit simulation, and experimental results.

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Integrated charge pumps: a generalised method for power efficiency optimisation

Cabrini

Gregori²,

Torelli

2016

IET Circuits, Devices & Systems

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Charge pumps (CPs) represent the most common solution for the implementation of fully integrated DC-DC converters. In fact, as opposed to buck/boost DC-DC converters, that need at least an external inductor, charge pump circuits do not require any external component. However, the achievable power efficiency of these circuits is typically significantly lower than power efficiency of buck/boost DC-DC converters. In this study, we develop a general mathematical model of CPs, aiming to provide basic design considerations for power efficiency optimisation. A quality factor for achievable power efficiency is proposed together with guidelines for the design of efficiency-optimised CPs under the constraint of given output voltage and current values.

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A general method for deriving output resistances of serial fixed type switched-capacitor power supplies

Cited by 35 publications

References 6 publications

A Design Methodology for Switched-Capacitor DC-DC Converters

A Design Methodology for Switched-Capacitor DC-DC Converters

Generic average modeling and simulation of the static and dynamic behavior of Switched Capacitor Converters

Integrated charge pumps: a generalised method for power efficiency optimisation

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