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LEAKAGE INDUCTANCE MODELS

LEAKAGE INDUCTANCE MODELS

One of the keys to a good engineering design, indistinctly of the technical branch, is a high accuracy in predicting the result of such design. When the design is a transformer, one of the most interesting parameters, due to its positive or negative influence in the power topology, including the risk of several iterations, is the leakage inductance. The objective of this application note is to present two models for calculating the leakage inductance, highlighting when each of them can be used, and to compare them with experimental measurements done in our laboratory.

15/01/2020

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LEAKAGE INDUCTANCE MODELS

LEAKAGE INDUCTANCE MODELS

One of the keys to a good engineering design, indistinctly of the technical branch, is a high accuracy in predicting the result of such design. When the design is a transformer, one of the most interesting parameters, due to its positive or negative influence in the power topology, including the risk of several iterations, is the leakage inductance. The objective of this application note is to present two models for calculating the leakage inductance, highlighting when each of them can be used, and to compare them with experimental measurements done in our laboratory.

15/01/2020

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LEAKAGE INDUCTANCE PART II

LEAKAGE INDUCTANCE PART II

The non-linked flux between primary and secondary windings of transformers lead to what is commonly known as the leakage inductance. Its magnitude plays a key role in modern switched-mode power supplies. Whether it needs to be minimized or maximized, the use of complex prediction models, that are many times far from reality, is required. The objective of this paper is to provide a general idea of the leakage inductance range values found in different topologies and turns ratios.

15/01/2020

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PHASE SHIFT FULL-BRIDGE MODULATION

PHASE SHIFT FULL-BRIDGE MODULATION

The Phase-Shift Full Bridge power topology has a lot of potential for its use in applications where high reliability is a major design driver. Reliability requirements impose the use of specific techniques, and these are easy to implement in this topology. However, relevant hi-rel markets such as aerospace and defence have important component choice and component procurement constraints related to part qualification, use of extended range components, radiation tolerance and so on. This Application Note aims to highlight the merits of this topology for such uses, giving practical examples of possible implementations.

15/01/2020

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CORE LOSSES CALCULATION PROBLEMS

CORE LOSSES CALCULATION PROBLEMS

At Frenetic we propose a new method for predicting ferrite properties. In this app note we will compare this new method with three other classical models for calculating hysteresis losses. These models have good accuracy in the frequency range from 50 kHz to 300 kHz, but have poor performance outside, mainly because of harmonics or closeness to saturation zone. In this application note, the results are shown.

15/01/2020

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HARMONICS IMPACT

HARMONICS IMPACT

The impact of harmonics over winding losses have already been analysed by Juan Gallego in his application note Impact of Harmonic Analysis in Magnetic Design. The objective of this paper is to show a real example case of how harmonics can considerably affect the performance of a transformer and to provide some guidelines for reducing such impact at the design stage.

16/09/2019

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Fringing flux effect in Inductance

Fringing flux effect in Inductance

The fringing flux is an effect that happens around air gaps when the magnetic cores are excited. The magnetic flux lines swell because the magnetic lines repel each other when passing through a nonmagnetic material, causing a decrease in the flux density. Many models have been developed along the years. In this app note six models are studied and compared against measurements, plotting the values and their relative error.

21/08/2019

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FRENETIC CON 2019 WAS A HUGE SUCCESS.

FRENETIC CON 2019 WAS A HUGE SUCCESS.

Our annual event served as an international platform to bring together experts from the power electronics and magnetics industry.

01/08/2019

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LEAKAGE INDUCTANCE IN TRANSFORMERS

LEAKAGE INDUCTANCE IN TRANSFORMERS

Designing a magnetic component with a specific leakage inductance can be challenging and difficult to predict as the theoretical results commonly differ form reality. The objective of this App Note is to show how to control the leakage inductance, and check the theoretical knowledge with experimental results.

05/07/2019

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PARASITIC CAPACITANCE IN PLANAR TRANSFORMERS

PARASITIC CAPACITANCE IN PLANAR TRANSFORMERS

In this app note we are going to prove the effectiveness of Frenetic AI calculating the parasitic capacitance comparing Frenetic estimation with the theoretically calculated using different models and real measurements.

11/06/2019

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COMPARISON OF ISOLATED DC-DC CONVERTER TOPOLOGIES FOR HIGH POWER APPLICATIONS

COMPARISON OF ISOLATED DC-DC CONVERTER TOPOLOGIES FOR HIGH POWER APPLICATIONS

In this application note a comparison of Phase Shifted Full Bridge (PSFB) and Full Bridge LLC (FB-LLC) converters will be presented.

28/05/2019

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PLANAR MAGNETICS DESIGN: TWO-DIMENSIONAL WINDING LOSSES CALCULATION

PLANAR MAGNETICS DESIGN: TWO-DIMENSIONAL WINDING LOSSES CALCULATION

The objective of this App Note is to compare two winding losses calculation models: the classical Dowell one-dimensional (1-D) model and a twodimensional (2-D) model, that takes the edge effect into consideration.

13/05/2019

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FULL BRIDGE TRANSFORMER DESIGN: KEY ASPECTS

FULL BRIDGE TRANSFORMER DESIGN: KEY ASPECTS

In this app note it will briefly commented some key aspects to take in consideration for the design of the Full Bridge transformer. It will consider a secondary side with center tap, but it can be considered for a single secondary winding.

09/05/2019

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INDUCTOR CHARACTERIZATION THROUGH THE MEASUREMENT OF MAGNETIC FLUX DENSITY

INDUCTOR CHARACTERIZATION THROUGH THE MEASUREMENT OF MAGNETIC FLUX DENSITY

As part of Frenetic's hardware testing of magnetic components, a magnetic flux measurement circuit has been developed.

29/04/2019

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COMMON-MODE NOISE REDUCTION THROUGH SHIELDING TECHNIQUE

COMMON-MODE NOISE REDUCTION THROUGH SHIELDING TECHNIQUE

In this application note common-mode noise reduction is discussed.

23/04/2019

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HYSTERESIS LOSSES: LOSSES IN THE CORE THAT RESULT IN AN INCREASE OF TEMPERATURE

HYSTERESIS LOSSES: LOSSES IN THE CORE THAT RESULT IN AN INCREASE OF TEMPERATURE

In this App Note hysteresis losses will be discussed.

15/04/2019

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