A high power buck-boost DC/DC converter for use in the powertrains of hybrid cars is presented. A special digital control strategy is implemented that allows a smooth change between both energy transfer directions. Equipped with this feature the converter can realize the energy management in the electric powertrain. The advantages of the hybrid system are shown by a hybrid fuel cell research car as an example. Application oriented data and test results of the used DC/DC converters are given. Two prototypes of highly efficient 24 kW and 70 kW bidirectional DC/DC converters were developed and evaluated. The digital control provides full protection against overvoltage, overcurrent and overtemperature. By integrated liquid cooling - up to 85 deg C - and very low losses, a high power density up to 5 W/cm3 is achieved. Characterization data of the converter and measurements in the target application - a hybrid fuel cell car - are presented.
High power buck-boost DC/DC converter for automotive powertrain applications
2005
6 Seiten, 13 Bilder, 2 Tabellen, 3 Quellen
Aufsatz (Konferenz)
Englisch
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