Column: Electric Vehicles


Figure 3: Vicor automotive decentralised


A 48V mild-hybrid system provides a way to rapidly introduce new vehicles with lower emissions, longer


range and higher gas mileage


Figure 4: Automotive centralised architecture showing heat dissipation


Maximising a 48V PDN Using a 48V battery to power the heavier powertrain and chassis system loads offers options to developers: Now there is a choice of adding systems that can deal directly with a 48V input, or, to retain legacy 12V electromechanical loads such as pumps, fans and motors, convert the 48V to 12V via a regulated DC- DC converter. In order to manage change and risk, existing mild-hybrid power delivery systems are slowly adding 48V loads but still use a large centralised multi-kW 48V-to-12V converter that provides 12V around the vehicle. However, this centralised architecture does not take the full advantage of a 48V PDN, nor does it utilise the benefits of available advanced converter topologies, control systems and packaging.


Figure 5: Automotive decentralised architecture showing heat dissipation


www.electronicsworld.com February 2023 19


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