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A novel welding monitoring and detection strategy for high voltage contactors in Electric Vehicles. Mercedes Benz Research and Development
- Format:
- Book
- Conference/Event
- Author/Creator:
- mohan, Neethu, author.
- Conference Name:
- Symposium on International Automotive Technology (2021-09-29 : Pune, India)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- DC fast charging brought a paradigm shift in EV and HEVbattery charging with reduced charging times. The high voltagecontactors are the major components in the DC fast chargecontroller and provide reliable and fast switching of DC power fromEVSE to battery. However, unstable voltages, high inrush currents,poorly designed surge protectors, end of electrical endurancelifetime et cetera cause welding of contactors while operating with highvoltages. In general, welding detection algorithms, the voltagesacross contactors are compared. Current welding strategy haslimitations as it does not detect high voltage contactor weldingduring charging, initiate power shut off, safe state is not reachedand welding factor not used for contactor lifetime calculation.This paper proposes a novel strategy to monitor and detect weldingusing contact resistances and lifetime counters to detect andreport welding even before the contactors are normally triggered toopen. The safe state is ensured and DC power transfer is shut downbefore contactor open trigger. The work focuses on continuouslymonitoring contactor resistance for not welded, partially weldedand welded conditions and use resistance measurements to calculatecontactor life time data with additional factor of wear and tearobtained from resistance measurements. This is advantageous to EVsas partial welding and welding probabilities are predicted in thisstrategy. The lifetime prediction algorithm is combined withwelding so as to get more accuracy. The currently available weldingdetection strategies are also analyzed and compared with thisstrategy
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-26-0166
- Access Restriction:
- Restricted for use by site license
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