Extending the Supercapacitor-Assisted Low-Dropout Regulator (SCALDO) Technique to a Split-Rail DC–DC Converter Application

Subasinghage, Kasun; Gunawardane, Kosala; Kularatna, Nihal; Lie, Tek Tjing

doi:10.1109/access.2019.2937754

Cited by 11 publications

(6 citation statements)

References 43 publications

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“…This technique [46,60] is unique, as it helps to increase the efficiency of a linear regulator by a factor where M = (1 + N) for cases in which the input voltage is much greater than the regulated output (e.g., 12-5 V conversion), and M = 1 + 1 N for cases where the input voltage is only slightly higher than the input (e.g., 5-3.3 V conversion), where N indicates the number of supercapacitors required [56]. The SCALDO technique was further extended to a dual-output split-rail version in [61].…”

Section: Supercapacitor-assisted Low-dropout (Scaldo) Regulatormentioning

confidence: 99%

Supercapacitor-Assisted Techniques and Supercapacitor-Assisted Loss Management Concept: New Design Approaches to Change the Roadmap of Power Conversion Systems

et al. 2021

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All electrical and electronic devices require access to a suitable energy source. In a portable electronic product, such as a cell phone, an energy storage unit drives a complex array of power conversion stages to generate multiple DC voltage rails required. To optimize the overall end-to-end efficiency, these internal power conversions should waste minimal energy and deliver more to the electronic modules. Capacitors are one of the main component families used in electronics, to store and deliver electric charges. Supercapacitors, so called because they provide over a million-fold increase in capacitance relative to a traditional capacitor of the same volume, are enabling a paradigm shift in the design of power electronic converter circuits. Here we show that supercapacitors could function as a lossless voltage-dropping element in the power conversion stages, thereby significantly increasing the power conversion stage efficiency. This approach has numerous secondary benefits: it improves continuity of the supply, suppresses voltage surges, allows the voltage regulation to be electromagnetically silent, and simplifies the design of voltage regulators. The use of supercapacitors allows the development of a novel loss-circumvention theory with applicability to a wide range of supercapacitor-assisted (SCA) techniques. These include low-dropout regulators, transient surge absorbers, LED lighting for DC microgrids, and rapid energy transfer for water heating.

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Section: Supercapacitor-assisted Low-dropout (Scaldo) Regulatormentioning

confidence: 99%

Supercapacitor-Assisted Techniques and Supercapacitor-Assisted Loss Management Concept: New Design Approaches to Change the Roadmap of Power Conversion Systems

et al. 2021

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“…Supercapacitor Assisted Surge Absorber Technique Supercapacitors (SCs) can be described as a family of very large capacitors where the capacitance is almost six to seven order larger than a traditional electrolytic or a film capacitor of the same canister size [6]. These devices come in capacitance values of 1 f to 70,000 F in single cell devices, where their DC rated voltage can be between 2.5 V to 4.0 V. Symmetrical SCs in the range of 1 F to 100 F are pretty small in size and they are only 15 to 20 % more expensive than a similar can size traditional capacitor [7]. When a SC of 1 -100F range is coupled with an ohms order loop resistance, it creates time constant in the range of few seconds to several 100 seconds.…”

Section: An Overviewmentioning

confidence: 99%

Supercapacitor assisted surge absorber (SCASA) technique: selection of magnetic components based on permeance

Thotabaddadurage

Kokuhennadige

Fernando

et al. 2021

2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Supercapacitors help building long time constant resistor-capacitor circuits. This property helps them withstand high voltage transient surges and dissipate transient energy in the resistive element of the circuit without exceeding the supercapacitor's DC voltage rating, which is usually between 2.5 to 4 V. SCASA is a patented technique, which was commercialized within the last five years. Successful implementation of this circuit topology, despite its simplicity, is quite dependent on the selection of the core of the coupled inductor utilized. This paper provides the essential details of the process of selecting the core for the magnetic component required, with a brief comparison of SCASA technique with a traditional surge protector, without any supercapacitors.

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“…DC-DC converters play an essential role in too many different applications, including renewable energy systems [1,2], hybrid or fully electric vehicles (EVs) systems [3,4], microgrids in power systems [5,6], and voltage regulation applications [7,8]. These converters are Luo Mahafzah converter Zeta The Buck-Boost converter can either step-up or step-down the output voltage using a low number of components.…”

Section: Introductionmentioning

confidence: 99%

A New Cuk-Based DC-DC Converter with Improved Efficiency and Lower Rated Voltage of Coupling Capacitor

et al. 2023

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DC-DC converters play a crucial role in recent and advanced applications, enabling efficient power conversion and management for renewable energy systems, electric vehicles, portable devices, and advanced communication systems. In line with this, the objective of this paper is to introduce a new DC-DC configuration based on the Cuk converter named as Mahafzah converter, which utilizes a coupling capacitor with a lower rated voltage. The paper aims to demonstrate the effectiveness of the proposed converter in terms of improved efficiency, reduced size, and reduced semiconductor device currents compared to the conventional Cuk converter. The proposed configuration comprises the same components as the Cuk converter, but in a different arrangement, without any additional elements. The main advantage of the proposed converter is using a coupling capacitor with a much lower rated voltage than the Cuk converter, resulting in a smaller capacitor size, reduced printed circuit board (PCB) size, and manufacturing cost. Additionally, the proposed converter reduces the currents of the semiconductor devices compared to those in the Cuk converter. To demonstrate its effectiveness, the converter is operated under continuous current mode (CCM) with a constant duty cycle and switching frequency. The study provides an in-depth discussion of the various operating modes by making use of equations relating to currents, voltages, duty cycles, and voltage gains. It also provides detailed illustrations of the limits between CCM and discontinuous current mode (DCM). The effectiveness of the proposed converter is demonstrated through a design example with operating parameters of 1 kW, 200 V/−300 V, and 20 kHz. Additionally, a low voltage–low power prototype (12/−18 V, 3.24 W, 20 kHz) is established to verify the operation of the proposed converter. Simulation and experimental verification of the proposed configuration achieved the desired results to improve efficiency and reduce the rate. The results clearly indicate that the efficiency of the proposed converter surpasses that of the conventional Cuk converter under identical operating conditions, reaching approximately 88% at rated load conditions.

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Extending the Supercapacitor-Assisted Low-Dropout Regulator (SCALDO) Technique to a Split-Rail DC–DC Converter Application

Cited by 11 publications

References 43 publications

Supercapacitor-Assisted Techniques and Supercapacitor-Assisted Loss Management Concept: New Design Approaches to Change the Roadmap of Power Conversion Systems

Supercapacitor-Assisted Techniques and Supercapacitor-Assisted Loss Management Concept: New Design Approaches to Change the Roadmap of Power Conversion Systems

Supercapacitor assisted surge absorber (SCASA) technique: selection of magnetic components based on permeance

A New Cuk-Based DC-DC Converter with Improved Efficiency and Lower Rated Voltage of Coupling Capacitor

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