Using Transformer Parasitics for Resonant Converters—A Review of the Calculation of the Stray Capacitance of Transformers

Biela, J.; Kolar, Johann W.

doi:10.1109/tia.2007.912722

Cited by 215 publications

(114 citation statements)

References 26 publications

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“…The stray capacitance in picofarad (pF) of coaxial inductors has been previously investigated in detail [2], [11], [23]- [30]. These studies support the idea that the stray capacitance can be evaluated by the superposition of the turn-to-turnand turn-to-layer capacitances.…”

Section: O Ptimization Of Coaxial Inductors Is Based On a Priorimentioning

confidence: 69%

“…Therefore, the evaluation of such quantities may help engineers and physicists in the arduous task of predicting the inductor's behavior before its construction. This is particularly relevant in the design of: 1) miniature implantable inductor links for wireless power transmission [1]- [6]; 2) inductive coupling of antennas for radio-frequency identification systems [7]; 3) high-sensitive magnetometers for space research [8]; 4) inductive magnetometers for geophysics applications [9], [10]; and 5) the construction of dc-dc converters to reduce switching losses [11].…”

Section: O Ptimization Of Coaxial Inductors Is Based On a Priorimentioning

confidence: 99%

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On Evaluation of Inductance, DC Resistance, and Capacitance of Coaxial Inductors at Low Frequencies

Martı́nez¹,

Babić

Akyel

2014

IEEE Trans. Magn.

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A priori evaluations of inductance, stray capacitance, and dc resistance are important aspects in optimizations of inductors. In this paper, analytical formulas of the inductance (self and mutual), dc resistance (solid and litz wires), and the stray capacitances of coaxial inductors were derived for both hexagonal and orthogonal windings. Possible imperfections that occurred during the fabrication process were accounted by the inclusion of axial and azimuth filling factors into the formulations. The formulas presented here were validated using several coaxial coils with rectangular cross sections as reported in the literature and double tested by measurements. Discrepancies between estimated and measured values were less than 1%. The advantage of the present formulation is that optimization efforts are addressed at the earliest stages possible of inductor conception and construction.

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Section: O Ptimization Of Coaxial Inductors Is Based On a Priorimentioning

confidence: 69%

Section: O Ptimization Of Coaxial Inductors Is Based On a Priorimentioning

confidence: 99%

On Evaluation of Inductance, DC Resistance, and Capacitance of Coaxial Inductors at Low Frequencies

Martı́nez¹,

Babić

Akyel

2014

IEEE Trans. Magn.

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“…Using resonant converters for both low and high voltage applications has recently become widespread owing to the advantages of these types of topologies, which absorb parasitic elements and feature high efficiency, high power density, and reduced Electromagnetic Interference [1][2][3][4][5][6]. According to Fig.…”

Section: Introductionmentioning

confidence: 99%

“…When using a compatible rectifier with a high frequency energy source, the high frequency rectifier, output filter and load can be modeled with an equivalent resistance, and existing theoretical formulas are useful for considering different characteristics of the converter output side [7][8][9]. Either in order to reduce the size of the power converters and increase power density in low output voltage applications, or because of the difficulties of building an inductor filter on the output side of high voltage DC power supply, many power converters are designed with pure capacitive output filters [2][3][4][5][11][12][13][14]. Consequently, analysis of parallel and seriesparallel resonant converters with pure capacitive output filters can result in new features and applications.…”

Section: Introductionmentioning

confidence: 99%

Output rectifier analysis in parallel and series-parallel resonant converters with pure capacitive output filter

Shafiei

Ordonez

Eberle

2014

2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014

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This paper analyzes the behavior of a pure capacitive output filter in parallel and series-parallel resonant converters. Unlike traditional resonant voltageand current-driven rectifiers, pure capacitive output filters present interruptions in power transfer from the transformer primary to the secondary, owing to the existence of a parallel resonant capacitor. Therefore, existing formulas for different specifications of the output rectifier (e.g., output voltage ripple, efficiency, etc.) cannot be employed. This work provides detailed analysis of, and design equations for, pure capacitive output filters to cover the characteristic behavior of this rectifier. These valuable equations can be employed in the design of both low and high voltage power supplies for a variety of applications such as telecom power supplies and medical therapy instruments. Experimental results of a 10kVDC, 1.1kW power supply are presented to validate the analysis, along with other comparative experimental examples. With the rapid growth of low and high voltage applications, the equations will benefit researchers and R&D engineers in the area of resonant power conversion.

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“…They are usually with lower efficiency, high energy consumption and long processing time. With the advantage such as small size, high efficiency and low energy consumption, high-frequency ESP power has been more and more widely used [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The influence of parallel capacitor to output voltage in high-frequency ESP power

Zhang¹,

Zhang²,

Zhou³

2013

2013 IEEE Electrical Power &Amp; Energy Conference

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High frequency power supply has been widely used in electrostatic precipitator (ESP) systems. High level of parasitic capacitance is generated in the windings of the transformer, which is used to boost voltage to around one hundred volt. The stray capacitor can be treated as a capacitor in parallel with primary winding of the transformer. Due to the parasitic capacitance of the high voltage transformers, the topology of the converter in ESP systems is actually LCC resonant converter rather than LC resonant converter. Analysis of four operating modes of the LCC resonant converter, and the calculation of the series inductance, series capacitors, shunt capacitance value are presented in this article. The influence of parallel capacitance to output voltage is analyzed and verified by experiment as well. The results provide the theoretical basis and guidance for the analysis, design and control of the high voltage resonant converters with parasitic capacitance, which especially presents a good application value for engineering of capacitor charging and electrostatic precipitator supply.

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Using Transformer Parasitics for Resonant Converters—A Review of the Calculation of the Stray Capacitance of Transformers

Cited by 215 publications

References 26 publications

On Evaluation of Inductance, DC Resistance, and Capacitance of Coaxial Inductors at Low Frequencies

On Evaluation of Inductance, DC Resistance, and Capacitance of Coaxial Inductors at Low Frequencies

Output rectifier analysis in parallel and series-parallel resonant converters with pure capacitive output filter

The influence of parallel capacitor to output voltage in high-frequency ESP power

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