A Seminumerical Transient Analysis of Switched Capacitor Converters

Kushnerov, Alexander

doi:10.1109/jestpe.2014.2342195

Cited by 7 publications

(9 citation statements)

References 24 publications

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“…As shown in [5], the considered SCC uses an iterative method to solve consistent systems, which can be overdetermined. Thus, the question is: what happens if the system is inconsistent?…”

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

“…Thus, the question is: what happens if the system is inconsistent? The working hypothesis is that the method given in [5] converges to a least squares solution. To understand the theoretical premises of this hypothesis, we consider a general case, , where:…”

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

“…It is evident that topology satisfies only one equation, , where is the -th row of . The transient behavior of SCC is described in [5] by introducing and , where is a time interval allotted to topology . At the end of each interval the voltages across all the capacitors are found by (4) , where , and is the number of switching periods.…”

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

“…The coefficients are called relaxation parameters. It is evident that and (5) In the particular case when , and , where is a unity matrix, the expression (4) is reduced to the Kaczmarz method [6]. If , the SCC operates in the no-charge (NC) mode with maximal efficiency [1,3].…”

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

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A least squares method applied to multiphase switched capacitor converters

Kushnerov

Yakovlev

2015

2015 European Conference on Circuit Theory and Design (ECCTD)

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The paper proposes a new approach to improve the performance of multiphase switched capacitor converters (SCC). It is based on the use of redundant SCC topologies, which are switched forward and backward. The performance is improved by increasing the efficiency and simultaneous reducing the output current ripple. The SCC is considered as an analog computer that solves the system of linear equations by an iterative method. The SCC output voltage is assumed to be constant. This means that the corresponding system has no solution. It is shown that under this condition, the SCC operating in the no-charge mode solves the system by a least-squares method. This allows finding the average current in each SCC topology and consequently, an analytical expression for the equivalent resistance. The obtained theoretical results agree well with the results of simulations.

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“…As shown in [5], the considered SCC uses an iterative method to solve consistent systems, which can be overdetermined. Thus, the question is: what happens if the system is inconsistent?…”

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

Section: Linear Equations In the Theory Of Sccmentioning

confidence: 99%

See 2 more Smart Citations

A least squares method applied to multiphase switched capacitor converters

Kushnerov

Yakovlev

2015

2015 European Conference on Circuit Theory and Design (ECCTD)

Self Cite

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“…On the other hand the quality of most inductors on chips today are very low. A possible solution would be excluding the inductors using a switched capacitor network [15], [16], however these are often not efficient outside their optimum voltage conversion ratio [17]. Achieving an efficient PwrSoC solution would require an inductor having a high quality factor [8], [18].…”

Section: Introductionmentioning

confidence: 99%

Integrated Very-High-Frequency Switch Mode Power Supplies: Design Considerations

Hertel

Nour

Knott

2018

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-This paper presents a power supply using an increased switching frequency to minimize the size of energy storing components, thereby addressing the demands for increased power densities in power supplies. 100 MHz and higher switching frequencies have been used in resonant power converters, which along with the possible integration of passive components on silicon wafer, present a beneficial solution in applications such as mobile phones. This paper presents a design for a 9 W class E resonant power converter in an 0.18 µm CMOS process. The converter is driven by a self oscillating gate drive, which is presented in an in-depth mathematical analysis. The gate resistance of the designed transistors is of critical importance in order to achieve the correct phase shift required for zero-voltageswitching. The Z-parameter method is used to characterize the transistors which is verified through simulations. The required spiral inductors was modeled, and simulations show Q values of as high as 14 at a switching frequency of 250 MHz. Simulations of the converter show an efficiency of 55 % with a self oscillating gate drive. However the modeled inductor was not adequate for operating with the self oscillating gate drive, presenting a future challenge for power supplies on chip.

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Unified and non-ideal switch model for analysis of switching circuits

Pekdemir

Yıldız

2021

COMPEL

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Purpose This paper aims to propose a new unified and non-ideal switch model for analysis of switching circuits. Design/methodology/approach The model has a single unified structure that includes all possible states (on, off) of the switches. The analysis with the proposed switch model requires only one topology and uses the single system equation regardless of states of switches. Moreover, to improve accuracy, the model contains the on-state resistance and capacitive effect of switches. The system equations and the states of switches are updated by control variables, used in the model. Findings There are no restrictions on circuit topology and switch connections. Switches can be internally and externally controlled. The non-ideal nature of the model allows the switch to be modeled more realistically and eliminates the drawbacks of the ideal switch concept. After modeling with the proposed switch model, a linear circuit is obtained. Two examples related to switching circuits are included into the study. The results confirm the accuracy of the model. Originality/value This paper contributes a different switch model for analysis of switching converters to the literature. The main advantage of the model is that it has a unified and non-ideal property. With the proposed switch model, the transient events, like voltage spikes and high-frequency noises, caused by inductor and capacitor elements at switching instants can be observed properly.

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A Seminumerical Transient Analysis of Switched Capacitor Converters

Cited by 7 publications

References 24 publications

A least squares method applied to multiphase switched capacitor converters

A least squares method applied to multiphase switched capacitor converters

Integrated Very-High-Frequency Switch Mode Power Supplies: Design Considerations

Unified and non-ideal switch model for analysis of switching circuits

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