Semiconductors in the 48V vehicle electrical system are used in particular for controlling electric motors and in the inverter for power distribution or for supplying the auxiliary units. They also provide the connection between the 48V and 12V electrical system levels by means of DC/DC converters. The Battery Management System (BMS) controls the battery state during charging and discharging and an intelligent functionality is needed to extend the battery lifetime. An E-Booster in combination with a turbocharger increases the charge pressure and improves the fuel efficiency. A 48V Dual Power Inverter for e-drive is an emerging new technology that enables the car manufacturer to build low cost 48V based BEV – ideal for city-cars. Corresponding semiconductor components required are sensors, microcontrollers, supply, and communication, power MOSFETs and driver ICs.
Get the whitepaper: Dual Inverter drive for light electric vehicles - a design study
An efficient and low-cost way to implement electric drive in a light vehicle is to use two in-wheel motors and two inverter drives. This study outlines a proposed architecture and the safety standards that the system must meet.
This design study considers the architecture of a dual inverter drive system for a light electric or hybrid electric vehicle in the EU L7e category, which limits electric drive power to 15kW and a running weight of 450kg for passenger types or 550kg for goods-carrying types, excluding batteries. Typical vehicles in this category are ‘heavy quadricycles’ – an EU classification that includes four-wheel ‘micro cars’ such as the Renault ‘Twizy’ as well as utility vehicles such as quad bikes. For simplicity, a 48V motor in each rear wheel is driven independently by two inverters with common control electronics.
The electrical system architecture will be considered, along with standards which apply for safety after component failure and on ‘cyber threats’ to the software controlling the system.
48V Architecture – Electrification of the Powertrain
While the first vehicles on the market with a 48V power network enabled performance and comfort features, today more and more OEMs announcing new mild hybrid electric vehicles with former 12V components moving to the 48V board net. Now components like pumps or fans with increased power demand can be supplied by 48V lithium ion battery. Furthermore, the 48V architecture opens up new possibilities to build efficient and low-cost electric drive in a light vehicle using in-wheel motors and two inverter drives.