Modeling approaches for dc–dc converters with switched capacitors To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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Modeling Approaches for DC–DC
Converters with Switched Capacitors
Abstract
Switched capacitor (SC) converters offer several
advantages such as light weight, small size, high power density,
and large voltage conversion ratios, which are important for a
large number of applications. For these reasons, increased
interest has been given to their design, modeling, and control.
Many control techniques for power converters are based on
nonlinear models; see, for instance, the extensive compendium
of control techniques presented. Such models and, consequently,
their associated nonlinear controllers are able to perform well in
wide ranges of operation compared with linearized models.
However, the conventional approach for the regulation of SC-
based converters is a linear feedback control that is based on
approximate small signal linearized models of the circuit
topologies. In some applications, this approach does not make
the converters able to respond well to requirements of regulation
in the presence of a wide range of input voltages and load
variations.

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Existing system:
Different approaches have been proposed for the modeling
of SC converters, such as incremental graph approaches, useful
for determining steady-state voltage gains. Approaches for
modeling SC are given by considering the inherent losses
produced when capacitors are connected in parallel. A steady-
state modeling approach is provided in which SC converters are
analyzed by considering equivalent output impedances.
Proposed system:
In this paper, we gather and discuss theory and principles
regarding the operation of SC converters. Moreover, we present
a systematic exposition of three modeling approaches for dc–dc
converters with SCs. The procedures are illustrated using a
Fibonacci SC converter and the three switch high-voltage
converter. The methods are similar to the classical averaging
techniques that consider equivalent circuits depending on the
position of the switches. However, instead of using the real
equivalent series resistor (ESR) lumped in the circuit, we
consider the following: 1) the case with ideal switches where
discontinuous signals are allowed; 2) an average loss modeling

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
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Mail : projects@lemenizinfotech.com
based on the results provided; and 3) a reduced-order model
based on a voltage-balancing property.

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Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Block diagram:
BUFFER
circuit
5VDC
PIC controller
circuit
OPTO coupler circuit12 V DC
LoadINPUT
DC supply
Switched
capacitor
cell 1
Switched
capacitor
cell 2
Filter

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Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.