Systematic Synthesis of Step-Down Switched-Capacitor Power Converter Topologies

Larsen, Dennis Oland; Vinter, Martin; Jørgensen, Ivan Harald Holger

doi:10.1109/tcsii.2019.2909442

Cited by 13 publications

(11 citation statements)

References 20 publications

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“…Another approach is to use a switched-capacitor DC-DC converter which has a power efficiency of up to 97% [399]. However, switched capacitor designs typically only divide the input voltage and do not provide the ability of voltage regulation [400]. A hybrid architecture has been shown in [401][402][403] where the first stage divides the battery voltage by five using a switched capacitor DC-DC converter, then the design uses an LDO in the second stage for output voltage regulation.…”

Section: Dc-dc Power Convertersmentioning

confidence: 99%

Powering internet-of-things from ambient energy: a review

et al. 2023

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Internet-of-thing (IoT) is an assembly of devices that collect and share data with other devices and communicate via the internet. This massive network of devices, generates and communicates data and is the key to the value in IoT, allowing access to raw information, gaining insight, and making an intelligent decisions. Today, there are billions of IoT devices such as sensors and actuators deployed. Many of these applications are easy to connect, but those tucked away in hard-to-access spots will need to harvest ambient energy. Therefore, the aim is to create devices that are self-report in real-time. Efforts are underway to install a self-powered unit in IoT devices that can generate sufficient power from environmental conditions such as light, vibration, and heat. In this review paper, we discuss the recent progress made in materials and device development in power- and, storage units, and power management relevant for IoT applications. This review paper will give a comprehensive overview for new researchers entering the field of IoT and a collection of challenges as well as perspectives for people already working in this field.

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Section: Dc-dc Power Convertersmentioning

confidence: 99%

Powering internet-of-things from ambient energy: a review

et al. 2023

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“…As mentioned above, the switched-inductor and capacitor configurations are the most promising solutions to achieve high conversion ratio. [20][21][22][23][24][25][26][27][28][29][30]. To validate the improved performances of the proposed converter, the step-up voltage gain, switch and diode stresses are plotted in this section.…”

Section: Comparative Performance Of the Proposed Regenerative Sc/si Cmentioning

confidence: 99%

“…As mentioned above, the switched‐inductor and capacitor configurations are the most promising solutions to achieve high conversion ratio. Table 1 clearly describes the comparative performances of the proposed regenerative SC/SI configurations with recently derived topologies [20–30]. To validate the improved performances of the proposed converter, the step‐up voltage gain, switch and diode stresses are plotted in this section.…”

Section: Comparative Performance Of the Proposed Regenerative Sc/simentioning

confidence: 99%

“…The idea of switched inductors (SIs) approach is popularly used in DC/DC converter to reduce the pulsating-current drastically while operating continuous conduction mode (CCM). A combined switched-capacitor and switchedinductors type and various similar derived topologies are presented in [20][21][22], to improve the converter performances such as device stress, current ripple and efficiency. In [23], a combined approach of switched-capacitor and cross active network stage (SC-ANC) is proposed, but, it has higher voltage stress and voltage conversion ratio is limited.…”

Section: Introductionmentioning

confidence: 99%

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Regenerative switched‐inductor/capacitor type DC–DC converter with large voltage gain for PV applications

Karthikeyan

Kumaravel

Kumar

et al. 2020

IET Power Electronics

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In grid-connected PV applications, the presence of a transformer not only increases the cost, size and weight, but also decreases the whole system efficiency, especially, under poor irradiation conditions. To eliminate the transformer and to meet DC link voltage, a regenerative switched-inductor/capacitor type DC-DC converter with large voltage gain is proposed in this study. In traditional boost type and derived converters, the voltage gain ratio is limited due to voltage stress on the semiconductor devices and low efficiency because of more components count and large duty cycle operation. The proposed converter recycles the energy in lossless passive components and increases the step-up voltage gain, which improves the efficiency. In addition, the converter possesses fewer ripples and smooth continuous current, which reduces the power loss, elongates lifespan of the input source and restricts electromagnetic interference issues. This study presents detailed operating waveforms, modes of operation and performance characteristics of the proposed converter. In order to validate the operation, 500 W experimental prototype is developed and verified with measured results. The proposed converter yields the peak efficiency of 95.20% for the output power of 440 W.

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“…1, the SCC comprises a switch network that can be implemented using transistors or diodes, flying capacitors to pump charges from one stage to another, and a control circuit that drives the switch network. In general, the SCC can be used to buck/boost the input voltage [1], [3]. Considering the way it is synthesized, SCC can be categorized into two main groups: topological and non-topological converters.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Improve the Voltage Conversion Ratio in Topological Switched-Capacitor DC–DC Converters Using Negator Stage

Mahnashi

2023

IEEE Trans. Circuits Syst. II

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This paper provides a simple yet novel structure to achieve voltage conversion ratio (VCR) that exceeds the theoretical attainable VCR of topological switched-capacitor DC-DC converters (SCC). Typically, the SCC terminals are connected to the input voltage, the output voltage, or the ground reference. The proposed structure in this paper utilizes the ground-connected terminals and instead connecting them to negative input voltage provided by a negator stage. Here, two types of SCC are used as case studies: Series-parallel (SPSC) and Fibonacci (FSC). The model for the proposed structure is constructed and verified experimentally using 3-stage SPSC and FSC. The experimental results are in good agreement with the proposed model with an error of less than 5% in all cases. The VCR obtained from the proposed structure exceeds the theoretical limits of conventional topological structures.Index Terms-Switched-capacitor converter (SCC), high-gain DC-DC converters, series-parallel (SPSC), Fibonacci switchedcapacitor converters (FSC), and voltage conversion ratio (VCR).

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Systematic Synthesis of Step-Down Switched-Capacitor Power Converter Topologies

Cited by 13 publications

References 20 publications

Powering internet-of-things from ambient energy: a review

Powering internet-of-things from ambient energy: a review

Regenerative switched‐inductor/capacitor type DC–DC converter with large voltage gain for PV applications

A New Approach to Improve the Voltage Conversion Ratio in Topological Switched-Capacitor DC–DC Converters Using Negator Stage

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