Common-Mode Chokes Eye EV Chargers Up to 30 kW
When building residential electric-vehicle (EV) charging stations, it’s vital to be able to identify potential electromagnetic-compatibility (EMC) challenges so that engineers can deal with them as early as possible in the design process.
To minimize electromagnetic interference (EMI) and filter out noise, Schaffner rolled out its new RV series of common-mode chokes for residential EV charging stations of up to 30 kW. With rated currents from 16 to 50 A per phase at temperatures of 60°C, the high-power chokes are designed to meet UL/IEC 60938-1/-2 and UL 1446 standards. They also have rated common-mode inductance levels of 0.1 to 7.2 mH.
The RV Series offers the choice between ferrite (RV8140 and RV8540) and nanocrystalline (RV8141 and RV8541) core technology. Each current rating comes with eight different performance and footprint options: half designed for vertical (RV8540) and the rest for horizontal (RV8140) mounting. Other features include low magnetic leakage flux, improved winding insulation, and low parasitic capacitance.
The new chokes have four windings that can be used on the ac or dc side of a residential wall box charging unit. On the grid side, the four lines can be installed as three phases and neutral. On the EV side, two windings of the choke are connected in series, offering very high attenuation and protecting the EV from electrical disturbances and noise.