A 42V powernet concept for soft hybrids

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A 42V powernet concept for soft hybrids

Bolz, S. / Knorr, R. / Lugert, G.

With the electrical motors available now, the automotive industry is struggling for the right energy storage devices, a standard PowerNet archiecture, and 42V compatible components. First ( low volume ) series vehicles will be on the market within the next three years and their acceptance will determine the speed of a volume market introduction of the 42V PowerNet. Since the electrical power at 42V is practically limited to some 10 kW, we would like to call a car equipped with these new vehicle functions a 'Soft Hybrid'. The 42 V PowerNet is seen as a test bed for the automotive industry to learn the whereabouts of power electronics and to develop a drivetrain architecture that accomodates the high power dynamics related to Stop-and-go, Boost and Regenerative Braking. For the Hybrid Vehicle the power electronics will look much like a soft hybrid, besides higher voltage and power. Eventually the Power MOS FETs may be replaced by IGBTs. With largely extended boost and recuperation energies the demand on high dynamic energy storage is largely increased ( e.g. fivefold ), calling for next generation SuperCaps. Again, a small, compact construction of the electronics is required. A separate water cooling circuit will no more be accetable for cost reasons, so high temperature converter technologies are required. ( This is not the case for the todays hybrids from Toyota and Honda ). The semiconductors may not be challenged by that temperatures, so bulk silicon appears still adequate. Packaging and interconnect technologies however will have to reach a new level of temperature durability and reliability. Among the passive components used in the converters we see the storage capacitors for the DC-link circuits as most critical.