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Analysis of a Battery Charging
System Powered by a Fuel Cell
Dr.-Ing. Uwe Knorr
Product Marketing Director
Ansoft Corporation
Pittsburgh, PA
Battery Charging Design Issues
Electrical design of the battery charging system
DC/DC Converter Design
Magnetic component design
Control design
Power Management
Battery behavior in drive cycles
SOC (State Of Charge)
SOH (State Of Health)
Charging System Structure
14/42V Bus Voltage
+ -
Power Battery
Source
Battery
Monitoring
Software
Loads
Power Management
Controller
Power Sources
Alternator Fuel Cell
AC, needs rectification, bus Low Voltage, independent
Output Voltage voltage, dependent on the from propulsion system,
engine speed limited current response
Bus voltage
None DC/DC, e. g. Boost Converter
converter
Control Built in voltage regulation Control via DC/DC converter
14/42V Bus Voltage 14/42V Bus Voltage
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