Design and comparison of high frequency transformers using foil and round windings

Iyer, Kartik V.; Robbins, W.P.; Mohan, Ned

doi:10.1109/ipec.2014.6870117

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…Here, I p is the current on the primary winding and δ is the skin depth. According to [18], ∆=0.1535 gives the conductor thickness to be d=0.083 mm when the frequency is 15 kHz. Based Fig.…”

Section: Resultsmentioning

confidence: 99%

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Single stage transformer isolated high frequency AC link based open end drive

Gandikota

Mohan

2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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An open end drive configuration utilizing a transformer isolated single phase high frequency ac link is presented. A high frequency ac link enables the use of a compact and light weight transformer to provide voltage transformation and galvanic isolation while the open end configuration leads to an improved utilization of the ac link. The desired output is synthesized using dual cycloconverters modulated using a space vector technique that has been modified to work with a high frequency ac link and leads to single stage conversion. Any change in the switch states is restricted to the zero crossings of the ac link to achieve zero voltage switching in the cycloconverters. The topology described also has the advantage of achieving natural commutation of leakage energy in the transformer windings and avoids the need for additional circuits to achieve the same. The proposed drive is simulated using MATLAB/Simulink and the results are discussed. A hardware prototype has been constructed to demonstrate the implementation of the proposed drive.

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Section: Resultsmentioning

confidence: 99%

“…Based Fig. 9: Multi-turn multi-layer foil winding of a transformer [18] on the current density J, the width of the foil conductor can be computed and the primary foil conductor dimensions are chosen as 0.003" X 0.5" inch. A similar computation for secondary windings yields the secondary foil conductor dimensions to be 0.003" X 1" inch.…”

Section: Resultsmentioning

confidence: 99%

Single stage transformer isolated high frequency AC link based open end drive

Gandikota

Mohan

2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Furthermore, to reduce the winding losses with large number of layers, it is suggested to interleave the high and low voltage winding [146]. Authors in [147] argue that interleaving can be avoided with an effective design.…”

Section: Winding Materials and Arrangementmentioning

confidence: 99%

Solid State Transformers: Concepts, Classification, and Control

et al. 2020

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Increase in global energy demand and constraints from fossil fuels have encouraged a growing share of renewable energy resources in the utility grid. Accordingly, an increased penetration of direct current (DC) power sources and loads (e.g., solar photovoltaics and electric vehicles) as well as the necessity for active power flow control has been witnessed in the power distribution networks. Passive transformers are susceptible to DC offset and possess no controllability when employed in smart grids. Solid state transformers (SSTs) are identified as a potential solution to modernize and harmonize alternating current (AC) and DC electrical networks and as suitable solutions in applications such as traction, electric ships, and aerospace industry. This paper provides a complete overview on SST: concepts, topologies, classification, power converters, material selection, and key aspects for design criteria and control schemes proposed in the literature. It also proposes a simple terminology to identify and homogenize the large number of definitions and structures currently reported in the literature.

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“…Hence, the DC resistance, R DC , of the winding can be calculated as 19.5 mΩ. Consequently, total DC loss, P DC is equal to 8.8 W, at rated current. Determine the high‐frequency losses arising from the proximity and skin effects : The high‐frequency loss at the operating point can be determined by plotting the high‐frequency resistance multiplier, R AC / R DC , as a function of winding thickness ratio, h / δ [15], where h is the winding thickness. AC resistance for this 16‐layer high‐current PCB design is found to be ∼5.36 R DC , as indicated in Fig.…”

Section: Systematic Design Approachmentioning

confidence: 99%