scholarly journals Transient and steady-state analysis of single switched capacitor converter

2019 ◽  
Vol 10 (1) ◽  
pp. 342
Author(s):  
Alexander Kushnerov
Keyword(s):  
Steady State ◽  
Switched Capacitor ◽  
Equivalent Resistance ◽  
Accurate Calculation ◽  
First Order ◽  
Voltage Ripple ◽  
Steady State Operation ◽  
Switched Capacitor Converter ◽  
Analytical Expressions ◽  
Transient And Steady State

<div class="WordSection1">The paper derives closed form expressions for transient and steady-state operation of a DC-DC converter with single switched capacitor. To this end, the result of each switching is considered as a point in the iterative process, and the function between the points is reconstructed. As opposed to the commonly accepted approach, when each of the topologies is approximated by a first order circuit, the proposed analysis is carried out for second order circuits. This allows obtaining the waveform of output voltage ripple and paves the way to more accurate calculation of equivalent resistance. The obtained analytical expressions were verified by simulations and an excellent agreement between the results was found.</div>

scholarly journals Transient and Steady-State Analysis of Single Switched Capacitor Converter

2018 ◽  
Vol 14 (1) ◽  
pp. 38-45
Author(s):  
Alexander Kushnerov
Keyword(s):  
Steady State ◽  
Switched Capacitor ◽  
Equivalent Resistance ◽  
Accurate Calculation ◽  
First Order ◽  
Voltage Ripple ◽  
Steady State Operation ◽  
Switched Capacitor Converter ◽  
Analytical Expressions ◽  
Transient And Steady State

The paper derives closed form expressions for transient and steady-state operation of a DC-DC converter with single switched capacitor. To this end, the result of each switching is considered as a point in the iterative process, and the function between the points is reconstructed. As opposed to the commonly accepted approach, when each of the topologies is approximated by a first order circuit, the proposed analysis is carried out for second order circuits. This allows obtaining the waveform of output voltage ripple and paves the way to more accurate calculation of equivalent resistance. The obtained analytical expressions were verified by simulations and an excellent agreement between the results was found.  

IMPROVEMENT OF POWER EFFICIENCY AND OUTPUT VOLTAGE RIPPLE OF EMBEDDED DC–DC CONVERTERS WITH THREE STEP DOWN RATIOS

2012 ◽  
Vol 21 (01) ◽  
pp. 1250007 ◽  
Author(s):  
KAUSHIK BHATTACHARYYA ◽  
P. V. RATNA KUMAR ◽  
PRADIP MANDAL
Keyword(s):  
Power Efficiency ◽  
Output Voltage ◽  
Cmos Process ◽  
Switched Capacitor ◽  
Switching Scheme ◽  
Time Interleaving ◽  
Regulation Scheme ◽  
Voltage Ripple ◽  
Switched Capacitor Converter ◽  
On Chip

In this paper three embedded switched capacitor based DC–DC converters targeting Vdd/2, 2Vdd/3, and Vdd/3 output voltages have been designed with improved power efficiency and output voltage ripple. The performance of each of the converter is improved by nonoverlapped rotational time interleaving (NRTI) switching scheme. Current regulation scheme is included with each of the above NRTI switched capacitor converter to achieve better load and line regulation. The proposed converters are designed and simulated in a 0.18 μm n-well CMOS process with the total flying capacitance of 330 pF and load capacitor of 50 pF. The capacitance values are kept within on-chip implementable range. The maximum power efficiency and the output voltage ripple of the integrated NRTI DC–DC converters targeted for Vdd/2, 2Vdd/3 and Vdd/3 output generation are 71.5% and 5 mV, 69.23% and 13.27 mV and 58.09% and 10.5 mV, respectively.

Transient Lubricating Films With Inertia—Turbulent Flow

1984 ◽  
Vol 106 (1) ◽  
pp. 134-139 ◽  
Author(s):  
H. G. Elrod ◽  
I. Anwar ◽  
R. Colsher
Keyword(s):  
Steady State ◽  
Turbulent Flow ◽  
Stream Function ◽  
Velocity Gradient ◽  
Eddy Viscosity ◽  
Mean Velocity ◽  
Steady State Operation ◽  
Pressure Development ◽  
Transient And Steady State

This paper presents some new equations for the treatment of turbulent lubricating films when the effects of inertia cannot be neglected. The eddy-viscosity concept is used to represent the turbulent stresses in terms of mean-velocity gradient. Transient and steady-state operation are both considered by means of a generalized stream-function-pressure development.

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