DC Link Capacitor in Electric Vehicles

Thread Starter


Joined Jun 6, 2020
My application is the EV powertrain. Most commercial electric vehicles tend to use film capacitors as high as 1000 uF or even more (link: https://info.ornl.gov/sites/publications/files/Pub26762.pdf). In this document, evaluation report of 2010 TOYOTA PRIUS is presented. The attached figure shows the screenshot from this document where a 30kW powertrain needs around 1000uF film capacitors. My estimate shows that it is way too big capacitor for just 30kW powertain.
My question is why would they use such big film capacitors when their rms current requirement (~100-200A) can be fulfilled by DC link capacitors of around 200 uF. I would be very thankful if experts in the area of Electric Vehicles can help me with this query.