Description

How it behaves

  • When a common-mode signal is applied the current travels in the same direction through both coils → magnetic core flux weakens → impedance is low

  • When a differential-mode signal is applied the current travels in the opposite direction through the coils → magnetic core flux builds up → impedance is high

What do Differential-Mode Chokes aim to solve

  • Lower magnetic stray fields → better EMI/EMC

  • Electromagnetic compatibility (EMC) with connected components/circuits

  • Toroidal shape → Lower magnetic stray fields → Better EMI/EMC compliance
  • Electromagnetic compatibility (EMC) with connected components/circuits

Voltage (RMS/peak) 400V / 550V
Current (RMS/peak) 70A / 80A
DC Resistance ~10mΩ
Inductance ~ 2mH
Q Factor * < 10
Frequency ** 300Hz - 400kHz


* At operating frequency (High Q at operating frequency, Low Q at noise frequency)
** High frequencies, especially above 300kHz, will limit power handling

  • Current balancing of parallelised MOSFET gate signals
  • Solar inverters
  • Power line EMC filters
  • Reducing SMPS dV/dt and dI/dt noise caused by transistor switching and input capacitor
    → Buck, Boost and Buck-Boost

Frequently asked questions

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