Issues and advances in high-frequency magnetics for switching power supplies

Lotfi, A.; Wilkowski, Matthew

doi:10.1109/5.931473

Cited by 60 publications

(24 citation statements)

References 28 publications

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“…Mn-Zn ferrites [5]. These are widely used for common mode noise filters and 10~500kHz transformer applications [6].…”

Section: Candidate Coresmentioning

confidence: 99%

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Proposal of Potted Inductor with Enhanced Thermal Transfer for High Power Boost Converter in HEVs

You¹,

Ko²,

Kim³

et al. 2015

Journal of Electrical Engineering and Technology

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-A hybrid electric vehicle (HEV) powertrain has more than one energy source including a high-voltage electric battery .However, for a high voltage electric battery, the average current is relatively low for a given power level. Introduced to increase the voltage of a HEV battery, a compact, high-efficiency boost converter, sometimes called a step-up converter, is a dc-dc converter with an output voltage greater than its input voltage. The inductor occupies more than 30% of the total converter volume making it difficult to get high power density. The inductor should have the characteristics of good thermal stability, low weight, low losses and low EMI. In this paper, Mega Flux ® was selected as the core material among potential core candidates. Different structured inductors with Mega Flux ® were fabricated to compare the performance between the conventional air cooled and proposed potting structure. The proposed inductor has reduced the weight by 75% from 8.8kg to 2.18kg and the power density was increased from 15.6W/cc to 56.4W/cc compared with conventional inductor. To optimize the performance of proposed inductor, the potting materials with various thermal conductivities were investigated. Silicone with alumina was chosen as potting materials due to the high thermo-stable properties. The proposed inductors used potting material with thermal conductivities of 0.7W/m·K, 1.0W/m·K and 1.6W/m·K to analyze the thermal performance. Simulations of the proposed inductor were fulfilled in terms of magnetic flux saturation, leakage flux and temperature rise. The temperature rise and power efficiency were measured with the 40kW boost converter. Experimental results show that the proposed inductor reached the temperature saturation of 107°C in 20 minutes. On the other hand, the temperature of conventional inductor rose by 138°C without saturation. And the effect of thermal conductivity was verified as the highest thermal conductivity of potting materials leads to the lowest temperature saturations.

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“…Mn-Zn ferrites [5]. These are widely used for common mode noise filters and 10~500kHz transformer applications [6].…”

Section: Candidate Coresmentioning

confidence: 99%

“…In recent years, the automotive industry has developed more efficient and eco-friendly vehicles such as EV, FCEV and PHEV to meet environmental requirements [1,2]. High power dc-dc converters have been proposed for these power trains to increase the stable output power [3].…”

Section: Introductionmentioning

confidence: 99%

Proposal of Potted Inductor with Enhanced Thermal Transfer for High Power Boost Converter in HEVs

You¹,

Ko²,

Kim³

et al. 2015

Journal of Electrical Engineering and Technology

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“…De plus, des progrès importants dans l'augmentation des limites de leur fréquence de commutation ont été effectués. Ainsi, depuis une vingtaine d'années, elles ont augmenté graduellement de 75 kHz au MHz, ce qui a permis de réduire considérablement la totalité des tailles de tous les éléments du convertisseur statique [11].…”

Section: Généralitésunclassified

Vers l'intégration de convertisseurs pour l'alimentation des microsystèmes

Estibals¹,

Sanchez²,

Alonso³

et al. 2003

J3eA

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“…There is an increasing demand for miniaturised power inductors and transformers that can be operated at high frequency either on a chip or on a module (Huljak et al 2000;Lotfi et al 2001;ITRS 2001). These inductive components have used either to power hand-held mobile electronic systems, locally distributed Points of Load (PoL) or power conversion electronic systems.…”

Section: Introductionmentioning

confidence: 99%

Design methodology and fabrication process of a microinductor for the next generation of DC–DC power converters

Flynn

Desmulliez

2009

Microsyst Technol

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Magnetic materials used in cored microinductors to supersede ferrite in the 0.5-10 MHz frequency range are investigated in this article. The performance of electrodeposited nickel-iron, cobalt-iron-copper alloys and the commercial alloy Vitrovac 6025 have been assessed through their inclusion within a custom-made solenoid microinductor. Although the present inductor achieves 77% power efficiency at 500 KHz for 24.7 W/cm 3 power density, an optimized process predicts a power efficiency of 97% for 30.83 W/cm 3 power density. The main issues regarding microinductor design and performance are discussed.

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Issues and advances in high-frequency magnetics for switching power supplies

Cited by 60 publications

References 28 publications

Proposal of Potted Inductor with Enhanced Thermal Transfer for High Power Boost Converter in HEVs

Proposal of Potted Inductor with Enhanced Thermal Transfer for High Power Boost Converter in HEVs

Vers l'intégration de convertisseurs pour l'alimentation des microsystèmes

Design methodology and fabrication process of a microinductor for the next generation of DC–DC power converters

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