High-Efficiency Switched-Capacitor DC-DC Converter with Three Decades of Load Current Range Using Adaptively-Biased PFM

Veerabathini, Anurag; Furth, Paul M.

doi:10.3390/jlpea10010005

Cited by 9 publications

(4 citation statements)

References 21 publications

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“…The paper [10] presented a modulation method to enhance the efficiency of a SCC operates to supply portable electronic devices assuming a wide range of load variation. It has been shown that decreasing the pulses frequency at light loading cuts the frequency-dependent losses and there-…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Development of an efficient voltage regulation mechanism for switched capacitor converter with exponential gain

Kadir

Ameen

Al-Badrani³

2022

EEJET

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The compact switched-capacitor converter with exponential gain and modular design has been adopted in this paper. Two approaches have been applied to improve the efficiency by providing multiple no-load voltages. The first modifies the switching strategy to bypass the gain of one or more stages. The second introduces modified design that provide additional no-load voltages through alternative current paths. The voltage regulation is implemented by two control loops: The outer loop is designed to produce the minimum feasible no-load voltage and the inner loop adjusts the duty ratio of the switching signals to regulate the voltage to meet the desired reference. Switched capacitor converters have been used as voltage multipliers with constant voltage gain. The efficiency of a switched capacitor converter depends on the ratio between regulated to unregulated output voltage. Therefore, output voltage adjustment of these converters causes a significant efficiency reduction. By providing multiple no-load voltages within the output voltage range the efficiency of the switched capacitor converter can be improved. The proposed design has been applied to a three-stage converter to provide six no-load voltages. Simulation results demonstrate that the average efficiency over the entire output voltage range is more than 90 % of its maximum efficiency of the unregulated switched capacitor converter which reflects the effectiveness of the proposed scheme. This paper offers an efficient method to regulate the voltage of a modular switched capacitor converter with exponential gain. The advantages of the proposed design are small number of added components, does not require additional sources and suitable for higher power range

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Voltage regulation of an SCC can be achieved by frequency control [10]. Reducing the switching frequency allows the capacitors voltage to drop and accordingly decreases the output voltage.…”

Section: Object and Hypothesis Of The Studymentioning

confidence: 99%

Development of an efficient voltage regulation mechanism for switched capacitor converter with exponential gain

Kadir

Ameen

Al-Badrani³

2022

EEJET

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“…The output voltage of an SCC can be attenuated from the maximum no-load voltage by adjusting the switching frequency or by modulating blanking intervals [18], [19]. The nominal efficiency of the SCC is equal to the ratio of the regulated to no-load voltages (Vo/Vo,OC).…”

Section: Introductionmentioning

confidence: 99%

Maximum resolution of switched capacitor converter: a graphical approach

Natheer

Kadir

2022

IJPEDS

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The efficiency of a switched capacitor converter can be represented as the ratio of the output voltage to open-circuit voltage. Switched capacitor converters with adjustable gain are designed with multiple no-load voltages to obtain higher efficiency over the voltage control range. This paper aims to realize the maximum resolution of a switched capacitor converter. A graphical representation of the output voltages formation has been proposed. The voltage composition diagram reveals a switching pattern of the multiphase operation cycle that leads to the desired output voltage. The proposed method has been applied to determine all possible output voltage levels that lead to maximum resolution. A three-capacitor converter has been controlled with the proposed scheme. The simulation results show that the output voltage follows the reference voltage closely. The converter provides 60% more output voltage steps compared to the nearest comparable design in the literature.

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“…Restriction of power consumption on the application core circuitry can compromise the performance of system. The use of high-efficiency DC-DC converters increases the runtime, and the use of fully-integrated converters, such as switched-capacitor converters, further helps to reduce the overall solution size [3]. Additionally, increasing the switching frequency of the DC-DC converter reduces the size of the energy element such as the inductor or capacitor [4].…”

Section: Introductionmentioning

confidence: 99%

Improved Frequency Compensation Technique for Three-Stage Amplifiers

Roman‐Loera

Veerabathini

Oropeza

et al. 2021

JLPEA

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Improved frequency compensation is proposed for a three-stage amplifier with reduced total capacitance, improved slew rate, and reduced settling time. The proposed compensation uses an auxiliary feedback to increase the total effective compensation capacitance without loading the output node. The proposed compensation scheme is validated in simulation by implementing a three-stage amplifier driving 10 pF load capacitor in a 0.18 μm CMOS process. A detailed comparison of the compensation with a conventional nested Miller compensation is also presented. The simulation results showed a reduction in total compensation capacitance and improvement in slew rate compared to conventional nested Miller compensation and the other reported techniques in the literature.

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High-Efficiency Switched-Capacitor DC-DC Converter with Three Decades of Load Current Range Using Adaptively-Biased PFM

Cited by 9 publications

References 21 publications

Development of an efficient voltage regulation mechanism for switched capacitor converter with exponential gain

Development of an efficient voltage regulation mechanism for switched capacitor converter with exponential gain

Maximum resolution of switched capacitor converter: a graphical approach

Improved Frequency Compensation Technique for Three-Stage Amplifiers

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