Fujitsu Component has Developed Automotive Relay FTR-K5 Series for 6.6kW EV/PHV On-Board Charger

Background

To extend the cruising distance of electrical vehicles (EV/PHV), the capacity of the on-board battery must be increased. Currently, existing standard 3.3kW chargers need too much time to fully recharge. To resolve this problem, the on-board charger capacity is being increased to 6.6kW. Relays used for the charger must also switch 6.6kW (32A-250VAC).

The new FUJITSU Component FTR-K5 relay series is a PCB relay that meets the 6.6kW capacity requirement well as automotive relay specifications.
Samples are available now, and mass production will begin in March 2020.

Features of FTR-K5 Series

1. 1. World’s first 32A-250VAC class automotive relay
   High capacity, 6.6kW (32A-250VDC) switching relay that also satisfies automotive relay specifications for severe vibration and shock resistance.
2. 2. Operable up to 105degC ambient temperature
   On-board charger is typically placed near the inverter. Therefore, the FTR-K5 uses heat resistant material that can withstand maximum 105degC ambient temperature. It is also designed to suppress the heat generation from relay coil. Its power consumption is only 900mW.
3. 3. High insulation
   Creepage distance between coil and contact is 8mm, which meets IEC61810-1 277V enhanced insulation requirement. Withstand voltage between coil and contact is 5,000VAC.
4. 4. 40A continuous power supply
   The relay can keep 40A continuous power supply (without switching) for 1 hour.
5. 5. Selectable enclosure
   Relay enclosure options are flux free or plastic sealed, according to the on-board charger’s form. Flux-free type is recommended for sealed charger units since it has longer life. Plastic-sealed type is good for non-sealed charger units, due to better resistance against dust and exhaust gas.

Fujitsu Component plans to expand the relay series for EV/PHV applications.