The Effect of DC Bias Conditions on Ferrite Core Losses

Baguley, Craig; Carsten, B.; Madawala, Udaya K.

doi:10.1109/tmag.2007.911594

Cited by 81 publications

(29 citation statements)

References 17 publications

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“…This induces different losses compared to those provided by manufacturers based on sinusoidal flux density [19]. DC bias has also a significant effect on losses [20]. In buck converter a PWM voltage is applied on the inductor and a DC bias depending on the load exists.…”

Section: Buck Converter Applicationmentioning

confidence: 99%

Power Loss Prediction and Precise Modeling of Magnetic Powder Components in DC–DC Power Converter Application

Hilal

Raulet

Martin

et al. 2015

IEEE Trans. Power Electron.

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In power electronics applications, magnetic components are often subjected to non-sinusoidal waveforms, variable frequencies and DC bias conditions. These operating conditions generate different losses in the core compared to sinusoidal losses provided by manufacturers. In the conception and design stage, lack of precise losses diagnosis has unacceptable effects on system's efficiency, reliability and power consumption. Since virtual prototyping is used to predict and improve system's behavior before realization, losses and behavior prediction of components is possible. Circuit simulators and their compatible components models are required. This work is summarized by proposing non-linear dynamic model of powdered material magnetic core for use in circuit simulators. It includes the material's nonlinear hysteresis behavior with accurate winding and core modeling. The magnetic component model is implemented in circuit simulation software "Simplorer" using VHDL-AMS modeling language. Waveforms and losses of a powder core inductor in a buck converter application are simulated and compared to measured ones. The model is validated for different ripple currents, different loads and a wide frequency range. DC bias is taken into account in both continuous and discontinuous conduction modes.

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Section: Buck Converter Applicationmentioning

confidence: 99%

Power Loss Prediction and Precise Modeling of Magnetic Powder Components in DC–DC Power Converter Application

Hilal

Raulet

Martin

et al. 2015

IEEE Trans. Power Electron.

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“…5 contains harmonics as well as a dc-component. It is shown in [8] that the ac-excursion in the flux density around a dc-offset causes core losses which by far exceeds values obtained by the same ac-excursion around the origin on the BH-curve. For this reason a simplified experiment was set up to measure the core losses for the case study at hand.…”

Section: Resultsmentioning

confidence: 88%

Overview of helical foil winding design for planar magnetic components

Pentz¹

2013

2013 IEEE International Conference on Industrial Technology (ICIT)

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This paper further elaborates on the topic of conductor optimization for planar helical foil windings. Part 1 of this work briefly covers the classical design methods and new schemes suggested for ac-inductors supported by two case studies. Optimisation of the windings used in filter inductors, carrying both ac-and dc-currents simultaneously, are handled in Part 2 of the publication. Winding shaping techniques, formerly used for cylindrical conductor windings, are adapted for helical foil windings placed in gapped cores. The concept of varying conductor thickness is further used here to achieve substantial reduction in overall losses with the further advantage of drastically reducing the time needed for obtaining the optimal winding shape. The calorimetric methods used to verify results experimentally are also included in this part.

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“…Ainda, no caso do conversor meia ponte assimétrico, a diferença nas tensões dos capacitores por si só produz a componente de nível médio. Sua presença nos conversores é responsável pelo aumento das perdas no núcleo, perdas em condução nos interruptores, degradando a densidade de potência do conversor [28], [29], o que limita a sua aplicação para potências baixas (menores que 1 kW).…”

Section: Introductionunclassified

Conversor CC-CC Paralelo Ressonante Meia Ponte Assimétrico com Saída em Tensão

Lazzarin¹,

Barbi²,

Delvanei³

et al. 2017

Eletrônica de Potência

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dobrador de tensão. A configuração possui número reduzido de interruptores, elimina circulação de corrente média nos elementos passivos tanto no primário quanto no secundário, e pode utilizar os parâmetros intrínsecos do transformador em seu projeto, o que a torna atrativa para aplicações como fontes de alta tensão de saída.Análise das etapas de operação, característica estática, equacionamento orientado ao projeto e a implementação de comutação sob tensão nula são abordados neste artigo. O estudo do conversor é verificado através de um protótipo de 1 kW, 400 V de entrada e 400 V de saída. O conversor apresentou rendimento elevado, acima de 97%, e comutação suave numa faixa de carga acima de 60% do valor nominal. Palavras-chave - HALF-BRIDGE PARALLEL RESONANT DC-DC CONVERTER WITH ASYMMETRICAL PWMAbstract -In this research, the study of a modified HalfBridge Parallel Resonant dc-dc converter is proposed. The proposed topology operates with constant frequency and asymmetrical PWM, such as the conventional one. The topology uses a voltage doubler rectifier in output stage, which avoid the flow of DC component current in the transformer primary. This characteristic improves the transformer design and eliminates the series capacitor, which is requred in the conventional half-bridge topology. The proposed topology also integrates the transformer parasitic elements, such as the leakage inductance and the winding capacitance in the operation, achieving zero voltage switching in transformer primary side switches, over a wide load range. Theoretical analysis, commutation analysis and design guidelines are presented in the paper. Experimental results from a 1 kW prototype, 50 kHz of switching frequency, 400 V at input voltage and 400 V A origem dos elementos parasitas ao longo do conversor está relacionada com sua aplicação. No contexto de fontes chaveadas para alta tensão, é comum o uso de transformador para conferir isolação galvânica ao projeto e elevação de ganho. Devido aos aspectos construtivos do transformador, necessários para operar com alta tensão, tais como número de espiras elevado, distância entre camadas, presença de material isolante, a presença dos elementos parasitas não pode ser desprezada, em especial da indutância de dispersão e da capacitância entre enrolamentos [3], [15], [16]. Estas podem ser responsáveis por provocar sobretensões e atrasos nas transições das tensões no transformador [17]. Já em veículos elétricos, incorporar os elementos parasitas propicia operar conversores com eficiência na ordem de 97%, com alguns exemplos encontrados em [18], [19].Um conversor CC-CC ressonante pode ser representado por três grandes blocos, conforme ilustrado no diagrama da Figura 1. Uma das principais características que diferencia os conversores ressonantes é a conexão dos elementos do circuito ressonante (também denominados de circuito tanque), sendo as configurações mais empregadas a série ressonante, a paralelo ressonante e a série paralelo ressonante [7]. Quanto ao estágio inversor de entrada, existem algu...

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The Effect of DC Bias Conditions on Ferrite Core Losses

Cited by 81 publications

References 17 publications

Power Loss Prediction and Precise Modeling of Magnetic Powder Components in DC–DC Power Converter Application

Power Loss Prediction and Precise Modeling of Magnetic Powder Components in DC–DC Power Converter Application

Overview of helical foil winding design for planar magnetic components

Conversor CC-CC Paralelo Ressonante Meia Ponte Assimétrico com Saída em Tensão

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