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For filtering three-phase and neutral on circuit boards, Schurter is offering the DKIH-4 series of four-line common mode chokes using nano-crystalline ring cores, with ratings from 10A to 40A.
"The power section is increasingly being mounted on the printed circuit board with discrete components," according to the firm. "However, due to the high integration density required to achieve a compact design, thermal problems can arise due to the high currents on the PCB. EMC interference can affect adjacent modules due to the lack of spatial separation." – going on to advocate a compact filter on the PCB with discrete components, including current-compensated choke with an open core to dissipate heat, plus capacitors.
DKIH-4 parts are designed according IEC 60938 and rated 500Vac or 760Vac, and designed for operation across -40°C to +100°C.
All are 31mm high and either 53 or 58mm in diameter.
There are standard versions, and customer-specific pin configurations and variants can be created on request.
Applications are expected in frequency converters, charging stations and un-interruptable power supplies.
Steve Bush