A transient core loss calculation algorithm for soft magnetic composite material

IEEE Trans. on Ind. Applicat.

Kharezy³

2016

121

The medium-frequency power transformer (MFPT) is one of the key elements of an isolated, bi-directional DC-DC converters in applications such as future all-DC offshore wind farms, traction and solid state transformers. This paper describes a design methodology taking into account the loss calculation, isolation requirements and thermal management. Incorporating this design methodology, an optimization process with a wide range of parameter variations is applied on a design example to find the highest power density while the efficiency, isolation, thermal and leakage inductance requirements are all met.

Section: B Fixed Parametersmentioning

confidence: 99%

Design Methodology and Optimization of a Medium-Frequency Transformer for High-Power DC–DC Applications

IEEE Trans. on Ind. Applicat.

Kharezy³

2016

121

Section: B Fixed Parametersmentioning

confidence: 99%

Design methodology and optimization of a medium frequency transformer for high power DC-DC applications

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

Kharezy

2015

The high power medium frequency transformer (HPMFT) is one of the key elements of an isolated, bi-directional DC-DC converters in applications such as future all-DC offshore wind farms, traction and solid state transformers. This paper describes a design methodology taking into account the loss calculation, isolation requirements and thermal management. Incorporating this design methodology, an optimization process with a wide range of parameter variations is applied on a design example to find the highest power density while the efficiency, isolation, thermal and leakage inductance requirements are all met.

“…To achieve this goal, the bulky 50/60 Hz transformers have been replaced with high power density DC-DC converters consisting of high-frequency transformers with lower weights and volumes. However, being exposed to higher frequencies, one should cope with extra losses coming from eddy current losses in the magnetic core [3], [4], excess losses in the windings due to enhanced skin and proximity effects [5], as well as parasitic elements, i.e., leakage inductance [6]- [8] and winding capacitance [9], [10], causing excess switching losses in the power semiconductors which is usually dominant at higher frequencies [11].…”

Section: Introductionmentioning

confidence: 99%

Accurate Evaluation of Leakage Inductance in High-Frequency Transformers Using an Improved Frequency-Dependent Expression

IEEE Trans. Power Electron.

2015

Moving towards higher power density in magnetic components, which is often realized by increasing the operating frequency, leads to the need for development of more accurate design tools, for example more accurate expressions for core losses, winding losses and leakage inductance calculations. This paper presents a new analytical expression intended to accurately evaluate the leakage inductance of transformers in the high frequency range in which the behavior of the magnetic field within the windings is altered. Unlike conventional expressions, which usually overestimate the leakage inductance at higher frequencies, this expression accounts for high frequency behavior of the magnetic field and provides high accuracy when operating at high frequencies. These high accuracy and applicability makes the derived expression of interest for designers to avoid time consuming finite element simulations without compromising with accuracy. The expression is validated by 2-D FEM simulation, as well as by measurements.