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This new standard requires the 12-V bus to continuously power the ignition, lighting, infotainment, and audio systems. The 48-V bus will power active chassis systems, air-conditioning compressors, adjustable suspensions, electric superchargers, turbos, and even regenerative braking.
The implementation of an additional 48-V supply network into vehicles isn’t without significant impact. Electronic control units (ECUs) will be affected and must have their operational range adjusted to the higher voltage. In addition, this will necessitate that manufacturers of dc-dc converters introduce specialized ICs to enable these high-power energy transfers with very high efficiency to conserve energy while simultaneously minimizing thermal design aspects.
The need for a bidirectional step-down and step-up dc-dc converter that goes between the 12- and 48-V batteries is clearly required. Such converters could be used to charge either of the batteries while simultaneously allowing both batteries to supply current to the same load if required in the system.
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