Charge Pumps for Ultra-Low-Power Applications: Analysis, Design, and New Solutions

Ballo, Andrea; Grasso, Alfio Dario; Palumbo, G.; Tanzawa, Toru

doi:10.1109/tcsii.2021.3070889

Cited by 25 publications

(20 citation statements)

References 74 publications

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“…Therefore, the current is flowing through the on-state power MOSFETs instead of their body diode. The voltage V Cn can be calculated by using Equation (1). In this mode, the top switches of both low-frequency half-bridges are turned off.…”

Section: Mode 2: Generation Of a Negative DC Voltagementioning

confidence: 99%

“…Topologies based on the concept of charge pumps [1][2][3] or switched-capacitors (SCs) are popular owing to attractive features, such as voltage boosting with natural voltage balancing, in their capacitors [4]. In [5][6][7], an SC is used to establish the concept of virtual dc-bus that can be discharged to generate a negative voltage across the load.…”

Section: Introductionmentioning

confidence: 99%

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A Dual-Buck-Boost DC–DC/AC Universal Converter

et al. 2022

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This paper proposes a universal converter that is capable of operating in three modes for generating positive dc voltage, negative dc voltage, and sinusoidal ac voltage. By controlling the duty-cycle of two half-bridges, an inductor is operated at a high frequency to control the voltage across two film capacitors that constitute a dual-buck-boost converter. Two additional half-bridges operating at a fixed state or line frequency are used to select the mode of operation. Compared to the latest universal converter in the recent literature, the proposed topology has the same switch count while reducing the number of conducting switches for inductor current and reducing the number of switches operating at high frequency. The operation of the proposed dual-buck-boost dc–dc/ac universal converter is analyzed. Experimental results are presented for validation. The power conversion efficiency of the 100 W experimental prototype modeled in PLECS is approximately 98%.

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Section: Mode 2: Generation Of a Negative DC Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Dual-Buck-Boost DC–DC/AC Universal Converter

et al. 2022

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“…Adequately designed charge pump circuits can be used as buck converters [14,15]. The literature lacks numerous simple and spread-spectrum-based modulation techniques on CE and peak-current harmonics levels for both conventional and interleaved buck converters.…”

Section: Introductionmentioning

confidence: 99%

Effects of Random Switching Schemes on the EMI Levels of Conventional and Interleaved Buck Converters for Mobile Devices

et al. 2022

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This study presents a comprehensive detailed analysis of the effect of five different random modulation switching schemes and their randomness levels on the elector magnetic interference (EMI) of designed simple and interleaved DC-DC buck converters for smartphone applications. The analyzed switching schemes are pulse width modulation (PWM), random pulse width modulation (RPWM), random pulse position modulation (RPPM), random carrier frequency modulation various duty (RCFMVD), and random carrier frequency modulation fixed duty (RCFMFD). The experimental analysis is performed for all aforementioned switching modulation schemes at the switching frequency of 20 kHz and different randomness levels (RL) (30% to 85%). For a fixed RL of 40%, the switching current harmonics/conducted emission (CE) levels are 5–10 dB/11 dBμV and 17 dB/14 dBμV lower for the RCFMVD case when compared to conventional PWM for both simple and interleaved buck-converters, respectively. The observed switching current harmonics and CE levels for interleaved schemes are around 23 dB and 12 dBμV lower when compared to the conventional simple buck converter scheme for the analyzed circuit configurations. The EMI levels decrease with the increase in the randomness levels from 30% to 85% with less variations in the output voltage level. The findings suggest that a interleaved buck converter circuit with the least-independent switching mechanisms and higher randomness is more appropriate for the reduction of both current spikes and CE levels with RCFMFD as the switching modulation scheme.

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“…Advancement in solid-state device manufacturing and the availability of alternative cheaper durable materials have been achieved. These breakthroughs enabled TEG electrical systems to emerge as dependable renewable energy systems [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Electronics 2021, 10, x FOR PEER REVIEW 2 of 21 cheaper durable materials have been achieved. These breakthroughs enabled TEG electrical systems to emerge as dependable renewable energy systems [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Optimal Control of Centralized Thermoelectric Generation System under Nonuniform Temperature Distribution Using Barnacles Mating Optimization Algorithm

et al. 2021

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The need for renewable energy resources is ever-increasing due to the concern for environmental issues associated with fossil fuels. Low-cost high-power-density manufacturing techniques for the thermoelectric generators (TEG) have added to the technoeconomic feasibility of the TEG systems as an effective power generation system in heat recovery, cooling, electricity, and engine-efficiency applications. The environment-dependent factors such as the nonuniform distribution of heat, damage to the heat-transfer coating between sinks and sources, and mechanical faults create nonuniform current generation and impedance mismatch causing power loss. As a solution to this nonlinear multisolution problem, an improved MPPT control is presented, which utilizes the improvised barnacle mating optimization (BMO). The case studies are formulated to gauge the performance of the proposed BMP MPPT control under nonuniform temperature distribution. The results are compared to the grey wolf optimization (GWO), particle swarm optimization (PSO), and cuckoo search (CS) algorithm. Faster global maximum power point tracking (GMPP) within 381 ms, higher power tracking efficiency of up to 99.93%, and least oscillation ≈0.8 W are achieved by the proposed BMO with the highest energy harvest on average. The statistical analysis further solidifies the better performance of the proposed controller with the least root mean square error (RMSE), RE, and highest SR.

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Charge Pumps for Ultra-Low-Power Applications: Analysis, Design, and New Solutions

Cited by 25 publications

References 74 publications

A Dual-Buck-Boost DC–DC/AC Universal Converter

A Dual-Buck-Boost DC–DC/AC Universal Converter

Effects of Random Switching Schemes on the EMI Levels of Conventional and Interleaved Buck Converters for Mobile Devices

Optimal Control of Centralized Thermoelectric Generation System under Nonuniform Temperature Distribution Using Barnacles Mating Optimization Algorithm

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