The traditional inductor-based buck converter has been the default design for switched-mode voltage regulators for decades. Switched capacitor (SC) dc–dc converters, on the other hand, have traditionally been used in low-power (<10><4:1)>80% over a load range of 5 mA to 1 A) than surveyed competitive buck converters, while requiring less board area and less costly passive components. The topology and controller enable a wide input range of 7.5–13.5 V. Controls based on feedback and feed forward provide tight regulation under worst case line and load step conditions. This study shows that the SC converter can outperform the buck converter, and thus, the scope of SC converter application can and should be expanded.

1. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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A High-Efficiency Wide-Input-Voltage Range Switched
Capacitor Point-of-Load DC–DC Converter
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ABSTRACT:
The traditional inductor-based buck converter has been the default design for switched-mode
voltage regulators for decades. Switched capacitor (SC) dc–dc converters, on the other hand,
have traditionally been used in low-power (<10 mW) and low conversion ratio (<4:1)
applications where neither regulation nor efficiency is critical. This study encompasses the
complete successful design, fabrication, and test of a CMOS-based SC dc–dc converter,
addressing the ubiquitous 12–1.5 V board mounted point-of-load application. In particular, the
circuit developed in this study attains higher efficiency (92% peak, and >80% over a load range
of 5 mA to 1 A) than surveyed competitive buck converters, while requiring less board area and
less costly passive components. The topology and controller enable a wide input range of 7.5–
13.5 V. Controls based on feedback and feed forward provide tight regulation under worst case
line and load step conditions. This study shows that the SC converter can outperform the buck
converter, and thus, the scope of SC converter application can and should be expanded.
KEYWORDS:
1. DC-DC power converters
2. switched capacitor circuits
3. switched-mode power supply
SOFTWARE: MATLAB/SIMULINK

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BLOCK DIAGRAM:
Fig. 1. Overall block diagram of the controller.
EXPECTED SIMULATION RESULTS:
Fig. 2. Expected and measured efficiency versus output current at an input Fig. 3. Expected andmeasured efficiency versus input voltage at
voltage around 8.7 V. output current around 50 and 220 mV.

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Fig. 4. Oscilloscope plot of loading and unloading output current step of 1 A Fig. 5. Comparison of efficiency between this work
and similar works.
at input voltage equals 9 V. Timebase 20 μs/div.
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CONCLUSION:
The traditional inductor-based buck converter has been the default design for switched-mode
voltage regulators for decades. Switched capacitor (SC) dc–dc converters, on the other hand,
have traditionally been used in low-power (<10 mW) and low conversion ratio (<4:1)
applications where neither regulation nor efficiency is critical. This study encompasses the
complete successful design, fabrication, and test of a CMOS-based SC dc–dc converter,
addressing the ubiquitous 12–1.5 V board mounted point-of-load application. In particular, the
circuit developed in this study attains higher efficiency (92% peak, and >80% over a load range
of 5 mA to 1 A) than surveyed competitive buck converters, while requiring less board area and
less costly passive components. The topology and controller enable a wide input range of 7.5–
13.5 V. Controls based on feedback and feed forward provide tight regulation under worst case
line and load step conditions. This study shows that the SC converter can outperform the buck
converter, and thus, the scope of SC converter application can and should be expanded.
REFERENCES:

4. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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[1] M. Seeman and S. Sanders, “Analysis and optimization of switched capacitor dc–dc
converters,” IEEE Trans. Power Electron., vol. 23, no. 2, pp. 841–851, Mar. 2008.
[2] M. Seeman,V.Ng, H.-P. Le,M. John, E. Aton, and S. Sanders, “Acomparative analysis of
switched-capacitor and inductor-based dc–dc conversion technologies,” in Proc. IEEE Workshop
Control Model. Power Electron. (COMPEL), Jun. 2010.
[3] M. Seeman, “A design methodology for switched-capacitor dc-dc converters,” Ph.D.
dissertation, UC Berkeley, Berkeley, CA, May 2009.
[4] High Efficiency, 250 mA Step-Down Charge Pump, Texas Instruments (TPS60503), Dallas,
TX, 2002.
[5] 500 mA High Efficiency, Low Noise, Inductor-Less Step-Down DC/DC Converter, Linear
Technology (LTC3251), Milpitas, CA, 2003.
For Simulation Results of the project Contact Us
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