E CORE FOIL, SOLID WIRE AND TOROIDAL INDUCTOR IMPEDANCES VS FREQUENCY expressed in dB

DIFFERENTIAL MODE NOISE FOR DIFFERENT INDUCTORS

EI and C cores create high parasitic capacitance inducing high frequency voltage oscillations. It increases electromagnetic interference and electrical stress for insulation and IGBT.

Lower parasitic capacitance from toroidal coil decreases high frequency oscillations.

The parasitic capacitance dominates the impedance above the self-resonant frequency of the inductor (typically 0.5-3 MHz for power electronics applications).

This parasitic capacitance reduces the impedance of an inductor at high frequencies and hence reduces its effectiveness for high frequency filtering.

Toroidal inductors present the best high frequency properties, therefore reduce EMI.

Please contact us for any free request and technical advice to review feasibility of toroidal winding technology for your inductors and transformers in your applications, or fill your RFQ on our online projects platform here