Common-mode noise analysis, modeling and filter design for a phase-shifted full-bridge forward converter

Makda, Ishtiyaq Ahmed; Nymand, Morten

doi:10.1109/peds.2015.7203521

Cited by 14 publications

(4 citation statements)

References 9 publications

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“…The equivalent circuit model of the transformer is a key factor in many aspects of a Switch-Mode Power Supply (SMPS) design, such as power loss calculation, common-mode (CM) and differential-mode (DM) filter design. An important element when designing a CM or DM filter is the amount of capacitance charged or discharged by the respective signals [1], [2]. The transformer models that currently exist does not clearly distinguish between whether the lumped capacitors are influenced by CM or DM signals, which is shown later in this paper.…”

Section: Introductionmentioning

confidence: 90%

A New Transformer Model with Separate Common-Mode and Differential-Mode Capacitance

Ostergaard

Kjeldsen

Nymand

2020

IECON 2020 the 46th Annual Conference of the IEEE Industrial Electronics Society

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A new transformer equivalent circuit model is presented containing separate common-mode and differentialmode capacitors, allowing for direct and simple analysis of the transformers influence. The representation of common-mode and differential-mode signals in two-winding transformers have been described and presented. Problems related to two commonly used transformer equivalent circuit models are shown. Operation scenarios of an isolated full bridge phase-shift DC/DC converter is used to compare the new transformer model with a commonly used model. Three transformers with different turns-ratio are constructed, with the purpose of evaluating the transformer models. Both models provided accurate impedance prediction for transformers with turns-ratio equal to one. However, for turns-ratios different from one, the commonly used model has an error of 40%-132% in the predicted equivalent capacitance of the measurements, whereas the proposed model only has an error of 0.6%-7.3%. The proposed model is therefore the only model that predicts accurate transformer behavior for any turns-ratio.

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Section: Introductionmentioning

confidence: 90%

A New Transformer Model with Separate Common-Mode and Differential-Mode Capacitance

Ostergaard

Kjeldsen

Nymand

2020

IECON 2020 the 46th Annual Conference of the IEEE Industrial Electronics Society

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“…In scenario 2 however, it is clear from the impedance in (2) that only the total self-capacitance ( 1 + 2 2 ) is measured, meaning that 12 = 0. The required terminal signals to only measure the affected capacitors in the respective scenarios, are deduced from (1), ( 2), ( 3), ( 4) and (5). The deduced voltage signals are listed in Table I, where the applied voltage signal from the impedance analyzer is denoted as .…”

Section: The Transformer Terminal Signal Potential For Parasitic Capacitor Calculationmentioning

confidence: 99%

“…As the switching frequency increases, the parasitic impedance has an increasing impact on the transformer performance. This is especially true for the capacitance of the transformer, which directly influences the capacitive power loss and noise emission [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Calculation of Planar Transformer Capacitance Based on the Applied Terminal Voltages

Ostergaard

Kjeldsen

Nymand

2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

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In order to calculate the parasitic capacitors of a transformer, it is important to apply the correct transformer terminal voltages such that only the desired lumped capacitors are charged. This paper shows the correct transformer terminal voltages that match measurement scenarios that are widely used to extract lumped capacitor values. The parasitic capacitors are calculated based on the stored energy in the transformer windings for different measurement scenarios. A 5kW heavily interleaved high turns-ratio planar transformer is constructed, and its parasitic capacitance is measured. Lumped capacitor simulations are performed using Ansys Maxwell 3D. The simulations are verified through comparison with the measurements and the difference from the measurements is between 1.55-3.76%. The calculation method has a difference of 9.92-10.38% compared to the simulated model, which primarily is caused by an assumption of overlapping turns which is different from the simulated model.

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“…For isolated power converters, the inter-winding capacitance of the transformer is a critical coupling path for common mode (CM) noise. The (CM) noise model of PSFB converter is analyzed in detail in [36,37]. However, the capacitance can be adjusted with low dielectric constant isolation between primary and secondary windings.…”

Section: Transformer Turns Ratio Selectionmentioning

confidence: 99%

A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications

et al. 2019

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The phase shift full bridge (PSFB) is a widely known isolated DC-DC converter topology commonly used in medium to high power applications, and one of the best candidates for the front-end DC-DC converter in server power supplies. Since the server power supplies consume an enormous amount of power, the most critical issue is to achieve high efficiency. Several organizations promoting electrical energy efficiency, like the 80 PLUS, keep introducing higher efficiency certifications with growing requirements extending also to light loads. The design of a high efficiency PSFB converter is a complex problem with many degrees of freedom which requires of a sufficiently accurate modeling of the losses and of efficient design criteria. In this work a losses model of the converter is proposed as well as design guidelines for the efficiency optimization of PSFB converter. The model and the criteria are tested with the redesign of an existing reference PSFB converter of 1400 W for server applications, with wide input voltage range, nominal 400 V input and 12 V output; achieving 95.85% of efficiency at 50% of the load. A new optimized prototype of PSFB was built with the same specifications, achieving a peak efficiency of 96.68% at 50% of the load.

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Common-mode noise analysis, modeling and filter design for a phase-shifted full-bridge forward converter

Cited by 14 publications

References 9 publications

A New Transformer Model with Separate Common-Mode and Differential-Mode Capacitance

A New Transformer Model with Separate Common-Mode and Differential-Mode Capacitance

Calculation of Planar Transformer Capacitance Based on the Applied Terminal Voltages

A Practical Approach to the Design of a Highly Efficient PSFB DC-DC Converter for Server Applications

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