SLLA497 September   2020 TMS320F28P550SJ , TMS320F28P559SJ-Q1

 

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Portable Chargers

Few Automotive OEMs are exploring the possibility of how ubiquitous DC chargers can lead to elimination of EV onboard chargers (OBC) in the years to come, making EVs more efficient and affordable. By pairing a portable (small form factor) DC charger with every EV, auto OEMs could be looking to eliminate OBC from EVs. Eliminating OBC from the car has numerous benefits such as:

• Reduced overall system cost, since Q100 qualified devices/system may not be required

• Serviceability of EV chargers becomes easier, no more downtime for your EV due to a charger breakdown

• Higher efficiency, that is, more miles per charge due to reduced gross vehicle weight

• Most importantly, the rate of charge will no longer be limited by the power rating of the OBC (which is the case while using a L1 or L2 AC charger)

These chargers are expected to be portable, that is, hand-held with a small form factor, natural convection based cooling (i.e. without fans). This may require manufactures to look at GaN/SiC based architecture that can switch in the order for 100s of kHz to a few MHz so as to reduce the size of the entire charger along with low thermal emissions. Figure 5-1 illustrates the block diagram of a portable EV charger.

GUID-484456ED-18BB-44F7-89E5-A53F1288FF5E-low.gifFigure 5-1 Portable EV Charger.