Switched-Capacitor Boost Converter for Low Power Energy Harvesting Applications

Rodič, M.; Milanovič, M.; Truntič, Mitja; Ošlaj, Benjamin

doi:10.3390/en11113156

Cited by 11 publications

(18 citation statements)

References 27 publications

(51 reference statements)

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“…A hybrid SIC converter that possesses the advantages of both a SC converter and a SI converter is an attractive solution [22][23][24][25][26][27][28][29][30]. However, it is complicated to design because of the many complex combinations of power switches and flying capacitors.…”

Section: Energy Transfer Mediamentioning

confidence: 99%

An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

Shin

2019

Energies

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As miniaturized mobile devices with various functionalities are highly desired, the current requirement for loading blocks is gradually increasing. Accordingly, the efficiency of the power converter that supports the current to the loading bocks is a critical specification to prolong the battery time. Unfortunately, when using a small inductor for the miniaturization of mobile devices, the efficiency of the power converter is limited due to a large parasitic DC resistance (RDCR) of the inductor. To achieve high power efficiency, this paper proposes an energy transfer media (ETM) that can make a switched inductor capacitor (SIC) converter easier to design, maintaining the advantages of both a conventional switched capacitor (SC) converter and a switched inductive (SI) converter. This paper shows various examples of SIC converters as buck, boost, and buck-boost topologies by simply cascading the ETM with conventional non-isolated converter topologies without requiring a sophisticated controller. The topologies with the ETM offer a major advantage compared to the conventional topologies by reducing the inductor current, resulting in low conduction loss dissipated at RDCR. Additionally, the proposed topologies have a secondary benefit of a small output voltage ripple owing to the continuous current delivered to the load. Extensions to a multi-phase converter and single-inductor multiple-output converter are also discussed. Furthermore, a detailed theoretical analysis of the total conduction loss and the inductor current reduction is presented. Finally, the proposed topologies were simulated in PSIM, and the simulation results are discussed and compared with conventional non-isolated converter topologies.

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Section: Energy Transfer Mediamentioning

confidence: 99%

An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

Shin

2019

Energies

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“…The converter topology is known as described in [1,8], but in the presented circuit, the diodes are replaced by transistors to improve efficiency issues. Moreover, the control algorithm is improved as well with the help of the decoupling of zdT s , as described in [8,9], to the time interval zT s when the switched capacitors are charged and the duty ratio of energised interval (d − z)T s ; see Figure 1. The time duration of the first frame controlled by parameter "Z" can be set based on the switched-capacitor capacitance and the chosen switching frequency.…”

Section: Introductionmentioning

confidence: 99%

“…In previously published applications, this was not considered, and intermediate voltage has not been stabilised. The constant zT s interval simplifies the implementation of non-linear control methods, which was relatively complex in [9].…”

Section: Introductionmentioning

confidence: 99%

Control of a Modified Switched-Capacitor Boost Converter

Ošlaj

Truntič

2022

Electronics

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Switched-capacitor converters and their alternatives have been shown to provide high efficiency with high power densities on smaller volumes, and can thereby be a suitable choice for energy harvesting. This paper proposes a hybrid power architecture based on a switched-capacitor topology and a boost converter that can be used for such purposes. A switching capacitor circuit can achieve any voltage ratio, allowing a boost converter to increase the input voltage to higher voltage levels. The first stage is unregulated with high-efficiency voltage conversion. The boost stage provides a regulated voltage output on such a converter. Rather than cascading two converters, their operation is integrated for the output voltage regulation. One major problem of switched-capacitor converters is output voltage regulation, which is solved by the interconnection of the power stages. The simplicity and robustness of the solution provide the possibility to achieve higher voltage ratios than cascading boost converters and provide higher efficiency. The converter’s size and cost can be improved with the integration of switching capacitors in DC-DC converter structures. A converter prototype has been designed, modelled, and built for the input voltage level of 2 V and power level of 5 W.

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“…Different strategies to step-up the voltage have been studied and proposed in the literature, such as: isolated step-up topologies [17,21,28], coupled-inductor, nonisolated topologies [29][30][31][32][33][34][35], nonisolated topologies with Capacitor-Diode/switch structure [19,[36][37][38], nonisolated topologies with Inductor-Diode/switch [39,40] and nonisolated topologies with Capacitor-Diode/switch and Inductor-Diode/switch structures [41,42]. These structures are known, respectively, as switched-capacitors and switched-inductors.…”

Section: Introductionmentioning

confidence: 99%

Novel Step-Down DC–DC Converters Based on the Inductor–Diode and Inductor–Capacitor–Diode Structures in a Two-Stage Buck Converter

et al. 2019

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This paper explores and presents the application of the Inductor–Diode and Inductor-Capacitor-Diode structures in a DC–DC step-down configuration for systems that require voltage adjustments. DC micro/picogrids are becoming more popular nowadays and the study of power electronics converters to supply the load demand in different voltage levels is required. Multiple strategies to step-down voltages are proposed based on different approaches, e.g., high-frequency transformer and voltage multiplier/divider cells. The key question that motivates the research is the investigation of the aforementioned Inductor–Diode and Inductor–Capacitor–Diode, current multiplier/divider cells, in a step-down application. The two-stage buck converter is used as a study case to achieve the output voltage required. To extend the intermediate voltage level flexibility in the two-stage buck converter, a second switch was implemented replacing a diode, which gives an extra degree-of-freedom for the topology. Based on this modification, three regions of operation are theoretically defined, depending on the operational duty cycles δ2 and δ1 of switches S2 and S1. The intermediate and output voltage levels are defined based on the choice of the region of operation and are mapped herein, summarizing the possible voltage levels achieved by each configuration. The paper presents the theoretical analysis, simulation, implementation and experimental validation of a converter with the following specifications; 48 V/12 V input-to-output voltage, different intermediate voltage levels, 100 W power rating, and switching frequency of 300 kHz. Comparisons between mathematical, simulation, and experimental results are made with the objective of validating the statements herein introduced.

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Switched-Capacitor Boost Converter for Low Power Energy Harvesting Applications

Cited by 11 publications

References 27 publications

An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

Control of a Modified Switched-Capacitor Boost Converter

Novel Step-Down DC–DC Converters Based on the Inductor–Diode and Inductor–Capacitor–Diode Structures in a Two-Stage Buck Converter

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