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Power-Dense High-Efficiency Engine-Coolant-Capable 200 kW Silicon Carbide Inverter for Heavy Duty Vehicles by Brij Singh

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B Singh
Abstract: - This presentation will discuss public information related to John Deere project funded by the US Department of Energy - PowerAmerica Institute at North Carolina State University, Raleigh. Through PowerAmerica, John Deere has formed a collaboration with researchers from the US Department of Energy National Renewable Energy Laboratory to develop a 200 kW 1050 VDC silicon carbide (SiC) dual-inverter. The SiC inverter converts vehicle engine power into electrical power needed for the permanent-magnet-motor based power-train used in heavy-duty construction and mining vehicles. The presentation will cover development and test verification of various technologies deployed in the successful realization of a power-dense (greater than 40 kW/Liter) high-temperature (suitable for 115C coolant) high-efficiency (greater than 98% over entre range of coolant) SiC dual-inverter. Test results from various generations of the SiC inverter will be presented. In April 2017, the Fargo, North Dakota-based John Deere Electronic Solutions (JDES) successfully demonstrated the SiC inverter in a John Deere 644K hybrid front loader vehicle, using the engine radiator fluid to cool the SiC power electronics. The SiC inverter technology demonstration took place at John Deere Dubuque Works (JDDW) in Dubuque, Iowa. Since then this SiC inverter has been operating on vehicles resulting over 2,000 hours experience from real-world application of SiC power electronics technology. The DOE-PowerAmerica funding has greatly helped John Deere to accelerate the development of SiC inverter technology including the realization of key commercialization objectives.
YouTube link related to JD 644K Hybrid front loader vehicle is; https://www.youtube.com/watch?v=j1g0NwhO4Fg


Bio: Brij N. Singh is a senior staff engineer in John Deere Inc., USA and leading the US Department of Energy - PowerAmerica (DOE-PowerAmerica) funded project to develop a 200 kW SiC inverter for heavy-duty vehicle applications. Brij has earned Ph.D. degree in Electrical Engineering from the Indian Institute of Technology, New Delhi, India, in 1996. In 1996, Brij joined the École de Technology Supérieure, Université du Québec, Montreal, QC, Canada, as a Post-Doctoral Fellow. In 1999, Brij joined Concordia University, Montreal, QC, Canada as a Research Fellow. In 2000, Brij joined the Department of Electrical Engineering and Computer Science, Tulane University, New Orleans, Louisiana, as an Assistant Professor. In 2007, Brij joined John Deere in Fargo, North Dakota as a power electronics staff engineer. In Tulane, Brij received numerous teaching awards for outstanding instructions in electrical engineering. In John Deere, Brij received numerous awards for product and technology innovations and team collaboration activities. Brij has published over 90 research papers in various Journals including IEEE Transactions and IET Journals. Brij has 22 US patents, one trade secret, and numerous pending patents. Brij’s scholarly work and publications have been cited by his peers over 6000 times.  Brij is a senior member of the IEEE. 


The Cascaded Resonant Converter: A Hybrid Switched-Capacitor Topology with High Power Density and Efficiency by Zichao Ye- Given by Young Professionals

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Zichao Ye Photo croppedAbstract: This seminar will cover the topic of hybrid and resonant switched-capacitor (SC) power converters. This class of converters has received increased attention lately, owing to superior power density and efficiency compared to conventional approaches. Starting with an overview and analysis of conventional SC power converters, the concept of the fast and slow switching limits will be introduced, and the limitations and design constraints of SC converters will be highlighted. Second, the soft charging technique in SC convert¬ers through current source behavior and resonant operation will be examined, along with analytical techniques for modeling and comparing the performance of different SC topologies. Then, an example cascaded resonant converter with 99% peak efficiency and 2500 W/in3 power density for data center applications will be analyzed in detail. The key control techniques to achieve such high performance, including zero voltage switching and interleaving control will be presented. Finally, practical challenges such as gate driving and capacitor voltage balancing will be discussed, along with a number of proposed techniques to mitigate such difficulties. 


Bio: Zichao Ye is currently a PhD student in the Electrical Engineering and Computer Sciences Department at the University of California, Berkeley, advised by Prof. Robert Pilawa-Podgurski. His research focuses on high density and high efficiency power converter design, with specific interests in hybrid and resonant switched capacitor converters and flying capacitor multi-level converters. His prior works include switched-capacitor topology modeling and comparison, compact and efficient floating gate drive power supply design, flying capacitor voltage balancing and efficient data center power delivery. Ye received his BS degree (with highest honors) and MS degree in Electrical Engineering, both from University of Illinois at Urbana Champaign in 2014 and 2016 respectively.




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