Bus Bar Design for EMC Performance of Power Converters in Fuel Cell Electric Vehicles

The power converter used in fuel cell electric vehicles (FCEVs)´ power train need to handle increasingly higher power. However, the space left for it is very limited in most cases. Such a contradiction makes it challenging to design a practical onboard power converter. Linear converters are not practical due to its low efficiency and high volume and weight. Switched-mode converters are reasonable and viable. But switched-mode converters are notorious for their EMI emissions. The need to incorporate a filter compromises the advantage of switched-mode converters in respect of volume and weight. A good solution is to utilize the distributed components of interconnected bus bars. This paper is focused on the design of low stray inductance bus bars in order for power converters to gain good EMC performance and high power density.