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ELECTRIFIED VEHICLE POWER CONVERSION FOR LOW VOLTAGE BUS

United States Patent Application

20180050597
A1
View the Complete Application at the US Patent & Trademark Office
An electrified vehicle high voltage battery pack has series-connected battery units or cells combining to provide the high voltage. To power a low voltage bus (e.g., for low voltage accessories or charging a low voltage battery) in a balanced manner, a plurality of DC/DC converters each has an input coupled to a respective battery unit and the converters have respective outputs coupled in parallel to the low voltage bus. A first loop controller receives an actual bus voltage. The first controller generates a target current in response to the bus voltage adapted to regulate the actual bus voltage to a target voltage less than the high voltage. A second controller distributes the target current into a plurality of allocated current commands for respective converters according to respective states of charge of the battery units connected to the converters.
HAND, III, MICHAEL J. (YPSILANTI, MI), ANDERSON, RICHARD DYCHE (PLYMOUTH, MI)
15/ 237,994
August 16, 2016
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0001] This invention was made with Government support under Contract No. DE-AR0000271 awarded by the Department of Energy. The Government has certain rights to the invention.