An accurate method for modeling transformer winding capacitances

Collins, Jeff

doi:10.1109/iecon.1990.149290

Cited by 25 publications

(8 citation statements)

References 2 publications

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“…where H in and H ex are the magnetic field intensity at the left and right hand side of each winding layer and can be calculated as (9). Also, α is defined as 1+j δ where δ is the skin depth at any particular frequency and d pri and d sec are the thickness of the primary and secondary conductors, respectively,…”

Section: Expression Derivationmentioning

confidence: 99%

“…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%

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

Bahmani

Thiringer

2015

IEEE Trans. Power Electron.

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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.

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Section: Expression Derivationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Bahmani

Thiringer

2015

IEEE Trans. Power Electron.

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“…The distributed capacitances of pulse transformer include the distributed capacitances to ground [30], capacitance between adjacent turns or layers of windings [29][30][31][32], and capacitance between the primary and secondary windings [32][33]. It is very difficult to accurately calculate every distributed capacitance.…”

Section: Distributed Capacitance Analysis Of Pulse Transformer Windingsmentioning

confidence: 99%

Hybrid Energy Storage and Applications Based on High Power Pulse Transformer Charging

Liu¹

2013

Energy Storage - Technologies and Applications

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“…However, this model is too complex to achieve circuit analysis. The equivalent lumped capacitance is used to represent the CM noise behavior of the transformer [7,[13][14][15], which can keep the displacement current rule. Then, the CM noise behaviors of the isolated power converters such as flyback converter, forward converter, and LLC resonant converter are analyzed in [7,8] based on displacement current rule.…”

Section: Introductionmentioning

confidence: 99%

“…Then, the CM noise behaviors of the isolated power converters such as flyback converter, forward converter, and LLC resonant converter are analyzed in [7,8] based on displacement current rule. With the help of the previous efforts [7,8,[12][13][14][15][16], this paper will propose a general transformer evaluation method for CM noise behavior. Only a signal generator and an oscilloscope can effectively evaluate the CM noise behavior of the transformer in the low-frequency range, which is easy to be implemented without the expensive cost of the professional CE EMI testing instruments.…”

Section: Introductionmentioning

confidence: 99%

A General Transformer Evaluation Method for Common-Mode Noise Behavior

Chen

Lin

2019

Energies

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In isolated power converters, the transformer is a key part of voltage transformation and isolation. Since common-mode (CM) noise is rather difficult to suppress compared with different-mode (DM) noise, more and more scholars are paying attention to the characteristics of CM noise, especially in high-frequency CM noise behaviors. CM noise can be further divided into conducted CM noise and radiated CM noise, and the main focus of this paper is on conducted CM noise. The CM coupling capacitance of the transformer is one of the main contributors of CM noise, which has been verified in many previous studies. Hence, eliminating the CM noise in a transformer coupling path can significantly lower the whole CM noise level of the converter. Professional conducted electromagnetic interference (EMI) testing instruments are quite expensive. In this paper, a general transformer evaluation technique for CM noise behavior is proposed. Only a signal generator and oscilloscope can achieve transformer CM noise behavior evaluation. PCB planar flyback transformers are designed, and a series of noise spectrums and voltage waveforms can verify the effectiveness of the proposed transformer evaluation method. The flyback adapter porotype can pass the EMI standard limited line EN55022 class B by the proposed evaluation method.

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An accurate method for modeling transformer winding capacitances

Cited by 25 publications

References 2 publications

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

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

Hybrid Energy Storage and Applications Based on High Power Pulse Transformer Charging

A General Transformer Evaluation Method for Common-Mode Noise Behavior

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