- High Impedance
- Toroidal shape → Lower magnetic stray fields → better EMI/EMC
- Electromagnetic compatibility (EMC) with connected components/circuits
Description
How it behaves
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When a common-mode signal is applied the current travels in the same direction through both coils → magnetic core flux builds up → impedance is high
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When a differential-mode signal is applied the current travels in the opposite direction through the coils → magnetic core flux weakens → impedance is low
What do Common-Mode Chokes aim to solve
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Lower magnetic stray fields → better EMI/EMC
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Electromagnetic compatibility (EMC) with connected components/circuits
| Voltage (RMS/peak) | 400V / 550V |
| Current (RMS/peak) | 70A / 80A |
| DC Resistance | ~ 2mΩ |
| Inductance | ~ 25mH |
| Q Factor * | < 10 |
| Frequency ** | 50Hz - 400kHz |
* At operating frequency (High Q at operating frequency, Low Q at noise frequency)
** High frequencies, especially above 300kHz, will limit power handling
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AC line EMC filters
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High-speed data interfaces, such as USB, HDMI and automotive CAN
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VFD common-mode voltage suppression → extending life of three-phase motor bearings
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Current-compensation circuits → The term "Common-Mode Chokes" and "Current-Compensation Chokes" are used interchangeably
Frequently asked questions
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