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A High Efficiency Wide Input Voltage Range Switched Capacitor Point of Load Dc Dc Converter

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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 (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.
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  ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 A High-Efficiency Wide-Input-Voltage Range Swit   ched Capacitor Point-of-Load DC–DC Converter 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  ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 BLOCK DIAGRAM: Fig. 1. Overall block diagram of the controller.   EXPECTED SIMULATION RE   SULTS: 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.    ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 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  µ s/div.   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:  ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com 󰀬 Website: http://www.asokatechnologies.in 0-9347143789/9949240245 [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, “Acompara   tive 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.  

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