EV Auxiliary Power
Today’s hybrid/electric vehicles (xEV) contain many vehicle sub-systems used to perform various auxiliary tasks. They have been traditionally powered by the 12 V battery, but are migrating to the high-voltage battery bus - typically 48 V, 400 V, or 800 V.
The main traction inverter converts DC current provided by the high voltage battery of the car, into AC current required by the induction motor responsible for producing the torque required to propel the vehicle. Performance of this module significantly contributes to the overall efficiency of the vehicle, in terms of its acceleration and driving range. Both conduction and switching losses must be carefully evaluated when selecting the required power electronics components of the inverter module, in order to achieve the vehicle's targeted drivetrain performance.
Electric Vehicle (EV) Charging
With the decarbonization of automobiles and other transportation vehicles, there will be an increasing need for vehicle charging infrastructure. Robust devices and systems, designed for safety and reliability, are needed to power the cars of the future.
48 V Power Architecture
A newly emerging technology in the xEV vehicle world is that of 48 V dual-voltage architecture MHEV systems. In these vehicles, the primary voltage source is a 48 V Lithium Ion (Li-ion) battery pack. These 48 V battery packs are capable of driving much higher power loads, as compared to the 12 V battery.
Plug-in hybrid/electric vehicles (xEV) include high voltage battery sub-systems, in addition to the 12 V battery. The 12 V battery must be charged from the HV battery using a DC-DC converter, housed in the vehicle. Since these converters are contained in the vehicle itself, they must be efficient and lightweight. The sizing of these units is dependent upon the vehicle’s 12 V power demands.
On Board Charging
Plug-in hybrid/electric vehicles (xEV) include a high voltage battery sub-system that requires some form of external charging. Multiple methods to accomplish this task are available. Some of them are built into the vehicle itself (On Board Charger or OBC), while others are external and may be incorporated through a wired connection (Fixed Charger) or through wireless energy transfer (Wireless Charger).