Optimization of Shielded PCB Air-Core Toroids for High-Efficiency DC–DC Converters

Orlandi, Silvia; Allongue, B.; Blanchot, G.; Buso, Simone; Faccio, F.; Fuentes, Claudio; Kayal, Maher; Michelis, S.; Spiazzi, G.

doi:10.1109/tpel.2010.2090902

Cited by 48 publications

(11 citation statements)

References 13 publications

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“…Therefore, when designing a WPT system with series inductors, modeling of the series inductors is very important. Inductance and resistance calculations through modeling of toroidal inductors have been performed in various previous studies [27][28][29]. One is a method using mathematical calculation [27,28], and the other is a calculation method using a magnetic field EM simulator [29].…”

Section: Analysis Of the Mpt And Pte Of The Wpt System With Series Inductorsmentioning

confidence: 99%

Design Considerations for Adding Series Inductors to Reduce Electromagnetic Field Interference in an Over-Coupled WPT System

et al. 2021

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This paper analyzes how over-coupled coils affect odd harmonic current and electromagnetic interference (EMI) in a wireless power transfer (WPT) system, and proposes design considerations for series inductors to solve the EMI problem. When the air gap of the coils of the WPT system decreases below a certain level and the coils are over-coupled, the odd harmonic component of the input impedance of the system decreases and odd harmonic currents increase. The increase in the odd harmonic components current quickly aggravates the EMI issues. To solve the EMI problem of the over-coupled WPT system, additional series inductors were applied to the system, and considerations for designing the series inductors were analyzed. When designing additional series inductors, power transfer efficiency, maximum power transfer, input impedance and odd harmonic components current must be considered. Using simulations and experiments, it was confirmed that the WPT system designed with analyzed considerations maintained relatively high efficiency and reduced EMI issues.

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Section: Analysis Of the Mpt And Pte Of The Wpt System With Series Inductorsmentioning

confidence: 99%

Design Considerations for Adding Series Inductors to Reduce Electromagnetic Field Interference in an Over-Coupled WPT System

et al. 2021

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“…Also, air core inductors are not limited by current saturation or by a Curie temperature limit, therefore offering much better linearity over wide operation range compared to their cored counterparts. Moreover, modern fabrication techniques [e.g., PCB [22][23][24][25][26][27][28][29], 3D printing [30], etc.] can be leveraged to reduce weight and cost without sacrificing performance.…”

Section: Switched Mode Dc-rf Power Inverter With Pcb Inductorsmentioning

confidence: 99%

An Integrated RF Power Delivery and Plasma Micro-Thruster System for Nano-Satellites

et al. 2018

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Progress in satellite technologies is ongoing and eventually finds applications back on Earth. Electric propulsion systems have been proven effective on large scale satellites (NASA DAWN) with better propellant efficiency than chemical or cold gas propulsion, and if miniaturized can be promising for long term operation of nano-satellites (e.g., CubeSats) in low Earth orbit or in deep space (NASA MarCO). However, the power supplies often used to power these electric thrusters, particularly those involving radiofrequency (RF) plasma, typically comprise power inefficient linear mode RF power amplifiers (e.g., class AB). These are simple systems designed to operate reliably under a wide range of loads for versatility, but they suffer low power efficiencies when operating at conditions significantly different from the nominal operating point. The required bulky and heavy thermal management components deem these electric propulsion systems impossible to fit on board nano-satellites. Here we present a compact and efficient switched mode dc-RF power inverter integrated with an electro-thermal plasma micro-thruster for nano-satellite (e.g., Cubesats) propulsion. The integrated system can serve as side panels and structural support of CubeSats, saving precious on-board volume for propellant and/or payloads. A complete assembly has been operationally tested in a space simulation system. This development opens a route for a new generation of power supplies applicable to the space sector, the microelectronics industry as well as the field of bioengineering.

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“…4 An air-core configuration is an alternative solution for megahertz-class power converters. [9][10][11][12] Air-core magnetic components are free from magnetic material iron losses. However, their magnetic flux density in the high-frequency region must be considered due to the following reasons.…”

Section: Introductionmentioning

confidence: 99%

Measurement of internal magnetic flux density distribution in air-core toroidal transformer under high-frequency excitation

Hashimoto

Okuda

Hikihara

2020

Review of Scientific Instruments

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An investigation of air-core toroidal transformers has been undertaken to enable power converters to achieve megahertz operation. The characteristics of the air-core toroidal transformer govern the behaviors of the internal magnetic flux of the transformer. Understanding the behaviors at an above-megahertz level is a key issue in the design of the air-core toroidal transformer. This paper discusses the internal magnetic flux density distribution in the air-core toroidal transformer under high-frequency excitation. We propose a measurement method for the distribution and show the obtained results under a sinusoidal excitation with an amplitude of 1.5 A and a frequency of 1 MHz. The results reveal a non-uniform distribution in the tangential and normal directions. The cause of this non-uniformity was found to be the structure of the air-core toroidal transformer. In addition, the validity of the proposed measurement method was confirmed by comparing the experimentally obtained results with a numerical estimation using the Biot-Savart law. These results suggest that the proposed measurement method is capable of investigating the distributed characteristics of air-core toroidal transformers under megahertz excitation.

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Optimization of Shielded PCB Air-Core Toroids for High-Efficiency DC–DC Converters

Cited by 48 publications

References 13 publications

Design Considerations for Adding Series Inductors to Reduce Electromagnetic Field Interference in an Over-Coupled WPT System

Design Considerations for Adding Series Inductors to Reduce Electromagnetic Field Interference in an Over-Coupled WPT System

An Integrated RF Power Delivery and Plasma Micro-Thruster System for Nano-Satellites

Measurement of internal magnetic flux density distribution in air-core toroidal transformer under high-frequency excitation

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