NOVELTY - An automotive power electronics system (26) comprises a support member; and at least one electronic die mounted to the support member, where the electronic die having an integrated circuit formed on it comprising at least one wide band gap transistor.    USE - As an automotive power electronics system (claimed) e.g. direct current-to-direct current (DC/DC) power converter or direct current-to-alternating current (DC/AC) inverter.    ADVANTAGE - The use of the wide band gap transistors allows increase in the frequencies at which the inverter and/or the bi-directional converter (BDC) is operated when compared to conventional silicon based transistors, thus improving efficiency. The increased frequency of operation of the inverter reduces the ripple current in the AC waveform that is provided to the electric motor which improves the efficiency of the electric motor, when compared to lower frequency operation of the inverter when using conventional silicon based transistors, which reduces power consumption, and in the case of a hybrid electric vehicle, decreases fuel consumption. Because of the increased operating frequencies, smaller and lighter components are used in the inverter and/or the BDC. The system has reduced manufacturing cost and decreased power consumption. The wide band gap operates at temperatures higher than conventional silicon based transistors, a single loop cooling system. As a result, manufacturing costs are even further reduced, as is power consumption.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an automotive power electronics propulsion system comprising a support member; and electronic dies mounted to the support member, each electronic die comprising a substrate having an integrated circuit formed on it, the substrate of each electronic die comprising a wide band gap semiconductor material and each integrated circuit comprising at least one wide band gap transistor; and    (2) an automotive propulsion system comprising an electric motor; at least one direct current (DC) power supply; a power inverter coupled to the electric motor and the DC power supply, the power inverter comprising a support member; and at least one electronic die mounted to the support member, the electronic die having an integrated circuit formed on it comprising at least one wide band gap transistor; and controller in operable communication with the power inverter and coupled to the electric motor and the DC power supply, the controller being configured to operate the wide band gap transistor.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of automobile.    Automobile (10)    Chassis (12)    Wheels (16)    Generator (20)    Battery (22)    Automotive power electronics system (26)