A Novel Quasi-Resonant Bridge Modular Switched-Capacitor Converter With Enhanced Efficiency and Reduced Output Voltage Ripple

2014 ◽  
Vol 29 (4) ◽  
pp. 1881-1893 ◽  
Author(s):  
Liangzong He
Keyword(s):  
Output Voltage ◽  
Switched Capacitor ◽  
Voltage Ripple ◽  
Switched Capacitor Converter

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.

scholarly journals Vertical Stacked LEGO-PoL CPU Voltage Regulator

2021 ◽  
Author(s):  
Minjie Chen
Keyword(s):  
Output Voltage ◽  
Input Voltage ◽  
Voltage Regulator ◽  
Switched Capacitor ◽  
Switched Capacitor Circuits ◽  
Coupled Inductors ◽  
Current Sharing ◽  
Charging Current ◽  
In Series ◽  
Switched Capacitor Converter

<div>This paper presents a 48 V–1 V merged-two-stage hybrid-switched-capacitor converter with a Linear Extendable Group Operated Point-of-Load (LEGO-PoL) architecture for ultra-high-current microprocessors, featuring 3-D stacked packaging and coupled inductors for miniaturized size and vertical power delivery. The architecture is highly modular and scalable. The switched capacitor circuits are connected in series on the input side to split the high input voltage into multiple stacked voltage domains. The multiphase buck circuits are connected in parallel to distribute the high output current into multiple parallel current paths. It leverages the advantages of switched capacitor circuits and multiphase buck circuits to achieve soft charging, current sharing, and voltage balancing. The inductors of the multiphase buck converters are used as current sources to soft-charge and soft-switch the switched-capacitor circuits, and the switched-capacitor circuits are utilized to ensure current sharing among the multiphase buck circuits. A 780 A vertical stacked CPU voltage regulator with a peak efficiency of 91.1% and a full load efficiency of 79.2% at an output voltage of 1 V with liquid cooling is built and tested. This is the first demonstration of a 48 V–1 V CPU voltage regulator to achieve over 1 A/mm2 current density and the first to achieve 1,000 W/in3 power density. It regulates output voltage between 0.8 V and 1.5 V through the entire 780 A current range.</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.  

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