Calculation of Leakage Inductance for High-Frequency Transformers

Ouyang, Ziwei; Zhang, Jun; Hurley, W.G.

doi:10.1109/tpel.2014.2382175

Cited by 141 publications

(87 citation statements)

References 14 publications

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“…Thus the magnetic field distribution in high-frequency within half-core window is similar to the distribution in low-frequency [19,20], shown in Fig. 6, where H(x) is the magnetic field intensity and x is the distance along x axis of core window.…”

Section: Leakage Inductance Of Integrated Transformer With Separated supporting

confidence: 52%

Calculation of Leakage Inductance of Integrated Magnetic Transformer with Separated Secondary Winding Used in ZVS PSFB Converter

Tian¹,

Zhang²,

Ren³

et al. 2016

Journal of Magnetics

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A novel zero voltage switching (ZVS) phase shift full bridge (PSFB) converter used in geophysical exploration is proposed in this paper. To extend the ZVS ranges and increase power density of the converter, external inductor acting as leakage inductance is applied and integrated into the integrated magnetic (IM) transformer with separated secondary winding. Moreover, the loss of ZVS PSFB converter is also decreased. Besides, the analysis and accurate prediction methodology of the leakage inductance of the IM transformer are proposed, which are based on magnetic energy and Lebedev. Finally, to verify the accuracy of analysis and methodology, the experimental and finite element analysis (FEA) results of IM transformer and 40 kW converter prototypes are given.

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Section: Leakage Inductance Of Integrated Transformer With Separated supporting

confidence: 52%

Calculation of Leakage Inductance of Integrated Magnetic Transformer with Separated Secondary Winding Used in ZVS PSFB Converter

Tian¹,

Zhang²,

Ren³

et al. 2016

Journal of Magnetics

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“…'FEKO' electromagnetic simulation software [25] is used, configured to use the 'Surface Equivalent Principle' and automatic mesh density selection.…”

Section: The Planar Transformer Modelmentioning

confidence: 99%

“…However, it has been shown in [25] that the leakage magnetic energy within the conductors decreases with frequency due to skin effect and becomes negligible at high frequency. The leakage energy within the conductor further becomes negligible when an infinitesimally thin conductor is assumed.…”

Section: Leakage Inductancementioning

confidence: 99%

The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

Vallabhapurapu¹,

Hofsajer²

2018

PIER C

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Abstract-This paper considers an ideal planar transformer wherein only the electromagnetic parasitics (stray capacitive and leakage inductance) arising out of the transformer geometry are taken into account, assuming lossless conditions. A suitable electrically equivalent circuit model for the planar transformer is used to analyze its frequency and power transfer characteristics; this model was validated by a three dimensional electromagnetic simulation of the planar transformer structure in FEKO electromagnetic simulation software. The effect of dielectric thickness on the bandwidth of the transformer has been analyzed based on the premise that the inherent stray capacitance and leakage inductance elements would affect the power transfer characteristics of the transformer. It has been found that the dielectric thickness of a planar transformer can be optimized so as to maximize the frequency bandwidth. It is also shown that the bandwidth is found to be sensitive to the thickness of the dielectric beyond the optimum thickness threshold t opt . Convenient closed form analytic expressions for the optimum dielectric thickness and the resultant maximum bandwidth are derived and presented. It is argued that these results can be readily used to benefit the design of air-core PCB/Planar transformers.

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“…Solving for L1 yields (20) in which L1,min is the minimum inductance of L1 for CCM. If RH = 640 Ω, fs = 40 kHz, n = 3, and D1 = D3.…”

Section: Step-up Modementioning

confidence: 99%

“…Since the coupled inductor can also feature electrical isolation, a BDC including coupled inductor is the major development. However, the energy dissipation caused from leakage inductor will degrade converter efficiency [19,20]. That is, clamped circuit or snubber mechanism for leakage energy harvesting is imperative.…”

Section: Introductionmentioning

confidence: 99%

Isolated DC-DC Converter for Bidirectional Power Flow Controlling with Soft-Switching Feature and High Step-Up/Down Voltage Conversion

Shen

Tsai

2017

Energies

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Abstract:In this paper, a novel isolated bidirectional DC-DC converter is proposed, which is able to accomplish high step-up/down voltage conversion. Therefore, it is suitable for hybrid electric vehicle, fuel cell vehicle, energy backup system, and grid-system applications. The proposed converter incorporates a coupled inductor to behave forward-and-flyback energy conversion for high voltage ratio and provide galvanic isolation. The energy stored in the leakage inductor of the coupled inductor can be recycled without the use of additional snubber mechanism or clamped circuit. No matter in step-up or step-down mode, all power switches can operate with soft switching. Moreover, there is a inherit feature that metal-oxide-semiconductor field-effect transistors (MOSFETs) with smaller on-state resistance can be adopted because of lower voltage endurance at primary side. Operation principle, voltage ratio derivation, and inductor design are thoroughly described in this paper. In addition, a 1-kW prototype is implemented to validate the feasibility and correctness of the converter. Experimental results indicate that the peak efficiencies in step-up and step-down modes can be up to 95.4% and 93.6%, respectively.

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Calculation of Leakage Inductance for High-Frequency Transformers

Cited by 141 publications

References 14 publications

Calculation of Leakage Inductance of Integrated Magnetic Transformer with Separated Secondary Winding Used in ZVS PSFB Converter

Calculation of Leakage Inductance of Integrated Magnetic Transformer with Separated Secondary Winding Used in ZVS PSFB Converter

The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

Isolated DC-DC Converter for Bidirectional Power Flow Controlling with Soft-Switching Feature and High Step-Up/Down Voltage Conversion

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