| 1. |
- Amirpour, Sepideh, 1980, et al.
(författare)
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Energy Loss Analysis in a SiC/IGBT Propulsion Inverter over Drive Cycles Considering Blanking time, MOSFET's Reverse Conduction and the Effect of Thermal Feedback
- 2020
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Ingår i: ECCE 2020 - IEEE Energy Conversion Congress and Exposition. ; :2020, s. 1505-1511
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Konferensbidrag (refereegranskat)abstract
- This paper presents a comparison of power and energy losses for two silicon carbide (SiC) and one silicon insulated gate bipolar transistor (Si-IGBT) power modules in a three-phase inverter, when considering the effect of blanking time and the MOSFET's reverse conduction. Two different drive cycles are chosen for the loss comparisons, the ECE-City manual and the Worldwide Harmonized Light Vehicles Test Cycle (WLTC). For the WLTC, the urban and highway phases are included. The focus of this paper is to determine the influence of the thermal feedback on the power loss calculation over the driving patterns. The analysis shows that, without accounting for the thermal feedback, the power loss levels are considerably underestimated, up to 1.5% on the conduction losses of the SiC inverters and up to 3% on the switching losses of the IGBT inverter over the ECE-City manual. Similarly, for the WLTC drive cycle, a loss increases up to 3.5% on the conduction losses of the SiC and up to 6% on the switching losses of the IGBT inverters are observed, when considering the thermal feedback. The data is derived at a chosen high torque, low speed operating point of a permanent magnet synchronous machine (PMSM) over the drive cycles. The operating point is considered as a worse operating condition from the power loss perspective.
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| 2. |
- Amirpour, Sepideh, 1980, et al.
(författare)
-
Highly thermal conductive graphene-based heatsink tailored for electric propulsion SiC-based inverter
- 2024
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Ingår i: Applied Thermal Engineering. - 1359-4311. ; 243
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Tidskriftsartikel (refereegranskat)abstract
- This study introduces an innovative multidisciplinary design approach for highly conductive and lightweight pin-fin-based heatsinks leveraging the advantages of graphene technology. The primary objective is to optimize the thermal management of silicon carbide (SiC) based inverters within electric vehicles (EVs). To closely emulate the real SiC power module, comprehensive analyses, including scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), are performed on the module. A detailed fluid dynamics model utilizing a 3D-conjugate heat transfer (CHT) methodology is employed to evaluate the thermal behavior of SiC power switches in contact with the coolant. The multidisciplinary analysis is initially implemented on an aluminum-based heatsink, validated experimentally, and subsequently compared to graphene. The integration of graphene in the heatsink design demonstrates notable improvements, including a 24.4 % increase in the heat transfer coefficient (HTC) and a 19.6 % reduction in thermal resistance (sink to fluid) at a 6 l/min fluid flow rate compared to its aluminum counterpart. Consequently, the SiC chips within the graphene-based heatsink exhibit an 11.5 % lower temperature rise compared to the aluminum version. The improvements in the cooling solution for SiC inverters in EVs, achieved through the adoption of graphene instead of traditional metals, serve as a proof of concept. This signifies a step forward in prioritizing the crucial balance between performance and power density.
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| 3. |
- Amirpour, Sepideh, 1980, et al.
(författare)
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Improving of Heat Spreading in a SiC Propulsion Inverter using Graphene Assembled Films
- 2021
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Ingår i: Advances in Science, Technology and Engineering Systems Journal. - : ASTES Journal. - 2415-6698. ; 6:6, s. 98-111
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Tidskriftsartikel (refereegranskat)abstract
- The focus of this work is first to establish the effect of the chip temperature and thermal feedback on the determination of the power loss in a three-phase propulsion inverter, then to demonstrate the possibility of achieving an improved heat spreading through the different layers inside a SiC power module by using graphene assembled films in the packaging of the power module. The power loss analysis has been carried out for two Silicon Carbide (SiC) modules in a vehicle inverter, incorporating the MOSFET’s reverse conduction as well as including the impact of blanking time on the inverter on-state losses. This data for calculating the losses is determined at an operationg situation below the filed weakening speed with a high torque for a PMSM machine The operating point is found to be the worst operating condition point when looking at the power loss point. First, it can be noted that not accounting for the thermal feed-back, the power loss is considerably underrated, i.e.,11-15% on the on-state converter. Following, the analysis of utilizing the graphene layer in the SiC module reveals a reduction of 10°C per SiC chips in the junction temperature of the SiC MOSFET is achievable. The reduction is calculated based on an applied power loss per SiC chips in steady-state simulation. Furthermore, up to 15°C decrease in the transient computation over the Worldwide Harmonized Light Vehicles Test Cycle (WLTC) per SiC chip is noticed. Moreover, a reduction up to 50% for the junction to case thermal resistance (Rth,JC) is observed by adding the graphene layer in the power module.
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| 4. |
- Amirpour, Sepideh, 1980, et al.
(författare)
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Mission-Profile-Based Lifetime study for SiC Module using Graphene Films
- 2022
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Ingår i: 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022. - 9781728193878
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Konferensbidrag (refereegranskat)abstract
- This work studies a lifetime comparison of silicon carbide (SiC) MOSFET’s chips in a SiC power module when incorporating and not incorporating graphene assembled films in the packaging of the SiC module. The Worldwide Harmonized Light Vehicles Test Cycle (WLTC) is used as a mission profile for lifetime comparisons. The analysis reveals that, Utilizing the graphene assembled films as a layer in the silicon carbide (SiC) module demonstrates an improved heat spreading through the different layers inside the module. This leads to a lower thermal stress as well as a lower accumulated damage on the SiC MOSFET’s chips for an applied worst condition power loss per chip. Therefore, a higher lifetime of 9.3% per chip is achieved when adding the graphene layer in the module compared to that of no graphene layer in the module packaging.
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| 5. |
- Amirpour, Sepideh, 1980, et al.
(författare)
-
Power Loss Analysis in a SiC/IGBT Propulsion Inverter Including Blanking Time, MOSFET’s Reverse Conduction and the Effect of Thermal Feedback Using a PMSM Model
- 2020
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Ingår i: IECON Proceedings (Industrial Electronics Conference). - 2162-4704 .- 2577-1647. ; :2020, s. 1424-1430
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Konferensbidrag (refereegranskat)abstract
- This paper presents a comparison of power losses for two silicon carbide (SiC) and one silicon insulated gate bipolar transistor (Si IGBT) power modules in a three-phase inverter, when considering the effect of blanking time and the MOSFET's reverse conduction. The total power losses versus different switching frequencies are also compared for the three inverters. The focus of this paper is to determine the influence of junction temperature and thermal feedback on the power loss calculation. The analysis shows that, without accounting for the thermal feedback, the loss levels are substantially underestimated, 11-15% on the conduction losses of the SiC inverters and up to 18% on the switching losses of the IGBT inverter. The data is derived at a chosen high torque, low speed operating point of a permanent magnet synchronous machine (PMSM). The operating point is considered as a worse operating condition from the power loss perspective.
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| 6. |
- Xu, Yu, 1996, et al.
(författare)
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Comparative study of efficiency improvement with adjustable DC-link voltage powertrain using DC-DC converter and Quasi-Z-Source inverter
- 2023
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Ingår i: 2023 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific). - 9798350314274
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Konferensbidrag (refereegranskat)abstract
- Adjusting the DC-link voltage in the electric pow-ertrain has proven to be beneficial for enhancing powertrain efficiency. This paper presents a comparative study between two adjustable DC-link voltage powertrain solutions: (1) Voltage Source Inverter (VSI) integrated with a DC-DC converter (VSI+DC-DC) and (2) Quasi-Z-Source Inverter (QZSI). Based on the different operation principles of the two solutions, DC-link voltage adjustment strategies have been proposed to maximize powertrain efficiency over drive cycle operation. With the help of simulation in the PLECS environment, the powertrain losses of the two solutions are examined over the WLTC drive cycle. The results suggest both solutions can achieve significant powertrain loss reduction compared to the conventional powertrain with fixed DC-link voltage. In addition, the QZSI solution sees a 20% higher loss in power electronics than the VSI+DC-DC solution, as the DC-link voltage in the QZSI solution has to be boosted to higher values. Nevertheless, from an overall powertrain perspective, the QZSI solution has only 3% higher powertrain losses compared to the VSI+DC-DC solution, making QZSI remain an attractive alternative for adjustable DC-link powertrain given its advantages such as fewer active switches and improved system reliability.
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