GaN transistors efficient cooling by graphene foam

Antonini, Mattia; Cova, Paolo; Delmonte, Nicola; Castellazzi, Alberto

doi:10.1016/j.microrel.2018.07.004

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…However, the impedance of the top-cooled converter is more stable since it begins to grow at 10 MHz. The parasitic inductance values were calculated using these impedances and Equation (25). The resistance of the PCBs is equal to the impedance at low frequencies.…”

Section: Parasitic Elements Analysismentioning

confidence: 99%

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Effect of the Heat Dissipation System on Hard-Switching GaN-Based Power Converters for Energy Conversion

et al. 2021

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The design of a cooling system is critical in power converters based on wide-bandgap (WBG) semiconductors. The use of gallium nitride enhancement-mode high-electron-mobility transistors (GaN e-HEMTs) is particularly challenging due to their small size and high power capability. In this paper, we model, study and compare the different heat dissipation systems proposed for high power density GaN-based power converters. Two dissipation systems are analysed in detail: bottom-side dissipation using thermal vias and top-side dissipation using different thermal interface materials. The effectiveness of both dissipation techniques is analysed using MATLAB/Simulink and PLECS. Furthermore, the impact of the dissipation system on the parasitic elements of the converter is studied using advanced design systems (ADS). The experimental results of the GaN-based converters show the effectiveness of the analysed heat dissipation systems and how top-side cooled converters have the lowest parasitic inductance among the studied power converters.

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Section: Parasitic Elements Analysismentioning

confidence: 99%

“…Different methods to characterise solid TIMs were analysed by [24]. Finally, in [25,26], the effect of a graphene TIM on the dissipation of GaN transistors and converters was briefly studied. In industry, most power converters use commercial GaN e-HEMTs designed for forced-convection cooling.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Heat Dissipation System on Hard-Switching GaN-Based Power Converters for Energy Conversion

et al. 2021

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“…With the deepening of research, researchers observed that both sides of graphene can support precious metal substances, so graphene is gradually used as the support material of electrocatalyst [ 17 , 18 ]. Antonini [ 19 ] analyzed the effect of a graphene nanolayer on the activity of a catalyst by comparing the carrier carbon black, carbon nanotube, and graphene nanolayer, which can replace traditional carbon black as a catalyst support material for direct alcohol fuel cells. Xiao et al [ 20 ] developed a novel ethanol electrooxidation catalyst based on Pd nanoparticles supported by hydrogenated graphene.…”

Section: Introductionmentioning

confidence: 99%

Research on the Morphology Reconstruction of Deep Cryogenic Treatment on PtRu/nitrogen-Doped Graphene Composite Carbon Nanofibers

Zhu²,

Wang

et al. 2022

Materials

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To improve the performance of PtRu/nitrogen-doped graphene composite carbon nanofibers, the composite carbon nanofibers were thermally compensated by deep cryogenic treatment (DCT), which realized the morphology reconstruction of composite carbon nanofibers. The effects of different DCT times were compared: 12 h, 18 h, and 24 h. The morphology reconstruction mechanism was explored by combining the change of inner chain structure and material group. The results showed that the fibers treated for 12 h had better physical and chemical properties, where the diameter is evenly distributed between 500 and 800 nm. Combined with Fourier infrared analysis, the longer the cryogenic time, the more easily the water vapor and nitrogen enter polymerization reaction, causing changes of chain structure and degradation performance. With great performance of carbonization and group transformation, the PtRu/nitrogen-doped graphene composite carbon nanofibers can be used as an efficient direct alcohol fuel cell catalyst and promote its commercialization.

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On the Investigations of Chip-on-Board Ultra-Violet Sensor by Screen Printing of GaN Powder

Beh

Kamarulakmal

Rasiman

et al. 2020

J. Phys.: Conf. Ser.

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In this work, the characteristics of a chip-on-board screen printed GaN UV sensor was investigated. On the sensing element, GaN powders were obtained through ammonolysis of Ga2O3 at 1000°C under NH3 flow. The UV sensor platform was prepared using soft-lithography method, resulted in patterned circuit board. For the screen printing process, GaN powder is mixed with ethylcellulose/ethanol, subsequently deposited on the electrode pairs. The pure GaN sensor exhibited oscillations and change in amplitude upon UV sensing. This could be ascribed to high intrinsic resistance and parasitic capacitance and inductance. To mitigate this effect, rGO fillers were added and showed discern responds. Both sensors (with and without rGO) showed sensitiviy at 300 and 30% respectively, while the current magnitude for the latter was 54 times higher than that of former.

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GaN transistors efficient cooling by graphene foam

Cited by 9 publications

References 8 publications

Effect of the Heat Dissipation System on Hard-Switching GaN-Based Power Converters for Energy Conversion

Effect of the Heat Dissipation System on Hard-Switching GaN-Based Power Converters for Energy Conversion

Research on the Morphology Reconstruction of Deep Cryogenic Treatment on PtRu/nitrogen-Doped Graphene Composite Carbon Nanofibers

On the Investigations of Chip-on-Board Ultra-Violet Sensor by Screen Printing of GaN Powder

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