Differential power as a metric to optimize power converters and architectures

Cobos, J.A.; Cristobal, Helena; Serrano, Diego; Ramos, Regina; Oliver, J. A.; Alou, P.

doi:10.1109/ecce.2017.8096427

Cited by 33 publications

(26 citation statements)

References 7 publications

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“…6a. The angles ϕ 11 , …, ϕ 26 contained in k are calculated by applying the set of vectors from (20) to (8), resulting in the expressions presented in Table 2. The behavior of these angles with the duty cycle variation is shown through a polar diagram in Fig.…”

Section: Piecewise Fryze Power Theory Analysismentioning

confidence: 99%

“…In the past years, several studies evaluated different design rules of converter parameters aiming to achieve higher system efficiency [7][8][9][10][11]. The analysis of energy variation and power processing in SMPSs has been a recurring theme, but there is no efficiencycorrelated approach that considers all circuit devices and provides a single consistent figure of merit.…”

Section: Introductionmentioning

confidence: 99%

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Piecewise Fryze power theory analysis applied to PWM DC–DC converters

Santos

Hey

Zientarski

et al. 2020

IET Power Electronics

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This study proposes an extension to the well-known Fryze power theory, which allows the development of a mathematical procedure that defines a global factor for the active and non-active power processing in pulse-width modulated (PWM) dc-dc converters. This global factor is the dc power factor. The proposed extension is a vector representation of periodic currents and voltages mapped into a k-dimensional Euclidean space, which permits that all non-active power of all converter elements to be collected into a single figure of merit. To validate the approaches, a 220 W prototype of an isolated dc-dc Ćuk converter architecture was implemented and evaluated. Experimental results have confirmed that both total non-active power, the proposed dc power factor, and system efficiency are correlated. In the worst case of step-down mode, the converter prototype presented the lowest total non-active power of ∼25 var for the turns ratio of 0.567, resulting in the highest dc power factor of 0.135 and prototype efficiency of 80.6%. In step-up mode, it was obtained the lowest total non-active power of ∼1.14 kvar for the turns ratio of 1.764, resulting in the highest efficiency of 88.3% and dc power factor of 0.145.

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Section: Piecewise Fryze Power Theory Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Piecewise Fryze power theory analysis applied to PWM DC–DC converters

Santos

Hey

Zientarski

et al. 2020

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…where η f e is the efficiency of the front-end converter. Note that the power loss highly depends on the converter efficiency which, in turn, highly depends on the converter topology and how the specific topology processes power through the components of the converter [34].…”

Section: Parallel Dpp System Analysismentioning

confidence: 99%

Design Considerations for Parallel Differential Power Processing Converters in a Photovoltaic-Powered Wearable Application

Lee

Kim

2018

Energies

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Solar photovoltaic (PV) power is a widely used to supply power to the electric grid but can also be used in lower-power emerging applications, like in wearables or the internet of things. One fundamental challenge of using PV power in flexible wearable applications is that individual PV modules point at various angles, thus receiving different light intensities. Using a series configuration for the PV modules greatly decreases power utilization under uneven irradiance conditions. Parallel differential power processing (DPP) converters are employed to address this power reduction problem, while maintaining individual PV control and maximizing output power. Two parallel DPP configurations, with and without a front-end converter, are analyzed and compared for a target battery-charging application. The DPP system without a front-end converter shows consistently high performance and operates properly over a wider range of lighting conditions. Maximum power point tracking (MPPT) algorithms are also examined for parallel DPP systems. When the MPPT parameters are properly calibrated, simulation results indicate that voltage-offset resistive control is the most effective at maximizing PV power under unbalanced lighting conditions.

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“…Furthermore, the advantages that PPP offers are very suitable for present and future coming applications, such as, energy storage systems (ESS) connected to renewable sources [2], [3] and electric vehicle (EV) fast charging stations [4]. This type of applications are usually considered as DC, but, there also exists some research around DC-AC inverters based on PPP [5], [6]. However, the present document focuses on describing PPP solutions for DC-DC applications.…”

Section: Introductionmentioning

confidence: 99%

Review of Architectures Based on Partial Power Processing for DC-DC Applications

et al. 2020

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This paper presents a review of advanced architectures based on the partial power processing concept, whose main objective is to achieve a reduction of the power processed by the converter. If the power processed by the converter is decreased, the power losses generated by the power converter are reduced, obtaining lower sized converters and higher system efficiencies. Through the review 3 different partial power processing strategies are distinguished: Differential Power Converters, Partial Power Converters and Mixed strategies. Each strategy is subdivided into smaller groups that entail different architectures with their own advantages and disadvantages. Also, due to the lack of agreement that exists in the sources around the naming of the different architectures, this paper seeks to stablish a nomenclature that avoids confusion when indexing this type of architectures. Regarding Partial Power Converters an extensive application oriented description is also developed. Finally, the main conclusions obtained through the review are presented.

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Differential power as a metric to optimize power converters and architectures

Cited by 33 publications

References 7 publications

Piecewise Fryze power theory analysis applied to PWM DC–DC converters

Piecewise Fryze power theory analysis applied to PWM DC–DC converters

Design Considerations for Parallel Differential Power Processing Converters in a Photovoltaic-Powered Wearable Application

Review of Architectures Based on Partial Power Processing for DC-DC Applications

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