Dual-Input Switched Capacitor Converter Suitable for Wide Voltage Gain Range

The capacitive-based switching converter suffers from low efficiency, except for a few conversion ratios, thus limiting its use in fine dynamic voltage and frequency scaling for the power management of digital circuits. Therefore, this paper proposes a Multiple Input Single Output Switched Capacitor Converter (MISO-CSC) to provide flatness efficiency over a large voltage gain range. First, the power efficiency calculation in MISO configuration is given, and then the best ones to optimize the number of switched capacitor structures is selected. By using two power supplies, the MISO converter produces 18 ratios instead of three in SISO (Single Input Single Output) mode. Using a CMOS 65 nm technology, the transistor-based simulations exhibit an average 15% efficiency gain over a 0.5-1.4 V output voltage range compared to the SISO-CSC.

[1]  Chris H. Kim,et al.  Deep trench capacitor based step-up and step-down DC/DC converters in 32nm SOI with opportunistic current borrowing and fast DVFS capabilities , 2013, 2013 IEEE Asian Solid-State Circuits Conference (A-SSCC).

[2]  Raymond Foley,et al.  Technology Roadmapping for Power Supply in Package (PSiP) and Power Supply on Chip (PwrSoC) , 2013, IEEE Transactions on Power Electronics.

[3]  Michael D. Seeman,et al.  The Road to Fully Integrated DC–DC Conversion via the Switched-Capacitor Approach , 2013, IEEE Transactions on Power Electronics.

[4]  Bruno Allard,et al.  A proposal of embedded SoC power supply compatible with a digital block design flow , 2014 .

[5]  Johann W. Kolar,et al.  A deep trench capacitor based 2:1 and 3:2 reconfigurable on-chip switched capacitor DC-DC converter in 32 nm SOI CMOS , 2014, 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014.

[6]  K. W. E. Cheng,et al.  Level-Shifting Multiple-Input Switched-Capacitor Voltage Copier , 2012, IEEE Transactions on Power Electronics.

[7]  Elad Alon,et al.  Per-Core DVFS With Switched-Capacitor Converters for Energy Efficiency in Manycore Processors , 2015, IEEE Transactions on Very Large Scale Integration (VLSI) Systems.

[8]  Yuen-Haw Chang,et al.  A Gain/Efficiency-Improved Serial-Parallel Switched-Capacitor Step-Up DC–DC Converter , 2013, IEEE Transactions on Circuits and Systems I: Regular Papers.

[9]  Olivier Trescases,et al.  Multi-input single-inductor dc-dc converter for MPPT in parallel-connected photovoltaic applications , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  Ke-Horng Chen,et al.  A Wide Load Range and High Efficiency Switched-Capacitor DC-DC Converter With Pseudo-Clock Controlled Load-dependent Frequency , 2014, IEEE Transactions on Circuits and Systems I: Regular Papers.

[11]  David M. Otten,et al.  Two-Stage Power Conversion Architecture Suitable for Wide Range Input Voltage , 2015, IEEE Transactions on Power Electronics.

[12]  Yong-Bin Kim,et al.  A fully integrated switched-capacitor DC-DC converter with dual output for low power application , 2012, GLSVLSI '12.

[13]  Charles R. Sullivan,et al.  Integrating Magnetics for On-Chip Power: A Perspective , 2013, IEEE Transactions on Power Electronics.

[14]  Meeta Sharma Gupta,et al.  System level analysis of fast, per-core DVFS using on-chip switching regulators , 2008, 2008 IEEE 14th International Symposium on High Performance Computer Architecture.

[15]  Gaël Pillonnet,et al.  Efficiency Comparison of Inductor-, Capacitor-, and Resonant-Based Converters Fully Integrated in CMOS Technology , 2015, IEEE Journal on Emerging and Selected Topics in Circuits and Systems.

[16]  Anantha Chandrakasan,et al.  A Fully-Integrated Switched-Capacitor Step-Down DC-DC Converter With Digital Capacitance Modulation in 45 nm CMOS , 2010, IEEE Journal of Solid-State Circuits.

[17]  S.R. Sanders,et al.  Analysis and Optimization of Switched-Capacitor DC–DC Converters , 2008, IEEE Transactions on Power Electronics.

[18]  Elad Alon,et al.  Design Techniques for Fully Integrated Switched-Capacitor DC-DC Converters , 2011, IEEE Journal of Solid-State Circuits.