SiC FETs in EV Applications

 

Practical electric vehicles have gone from niche to mainstream and have spawned a whole new application area for power conversion. In the vehicle, every watt lost in power conversion translates to shorter range, and in chargers translates to higher running costs and longer payback. Efficiency is key with an emphasis on the need for high voltage semiconductor switches with lowest loss. 

 

On-board Charging and DC/DC Converters

Performance improvements of SiC FETs and the availability of a wide range of Rds(on) classes in both through-hole and surface mount packages allows designers to keep improving on-board charger designs in efficiency, size, and thermal performance while keeping costs low. Furthermore, using a simpler 0 to 10/12/15 V gate drive helps manage cost and complexity.

EV Traction Inverters

Inverters needed for EV traction typically range between 60kW and 200kW. The use of SiC FETs in these designs can result in a 3X reduction in losses at 200kW and a 6X reduction in losses at 50kW. This ensures a stable thermal design for rapid periods of acceleration despite the much smaller size of SiC FETs. In addition, designers can realize excellent range enhancements from the light-load loss reduction.

 

EV Battery Chargers

SiC is enabling a revolution in EV transportation. In addition to their high critical breakdown voltage, high-temperature operation, and high thermal conductivity, SiC FETs boast high immunity to avalanche effects with over-voltages, high immunity to short circuits, and lower switching losses than other WBG devices due to lower device capacitance, making them ideal devices for EV charging applications.

400-500V_battery_charger_schematic

BEST 750V OPTIONS

TO-247-4L

TO-247-4L

6mO_button
9mO_button
11mO_button
18mO_button
D2PAK-7L_package_92x100

D2PAK-7L

9mO_button
11mO_button
18mO_button

BEST 1200V OPTIONS
(for 800V Bus)

TO-247-4L

TO-247-4L

23mO_button
30mO_button
53mO_button
70mO_button

Supporting Design Resources

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FET-Jet CalculatorTM

Quickly evaluate and identify the optimal SiC device for your power topology

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SiC FET Design Tips

Important SiC FET design considerations and snubber recommendations

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SiC FET User Guide

Practical solutions and guidelines for using RC snubbers with fast switching SiC devices

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Product Selector Guide

Find the ideal SiC FET and complimentary SiC devices for your high-performance power design

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