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DESIGN SKILLS FOR COMMON MODE CHOKES
By combining material technology and application skills VAC offers Common Mode Chokes with a very broadband attenuation in the 150 kHz to 30 MHz frequency range. The current-compensated chokes are also characterised by excellent temperature stability and a small size.
Common Mode Chokes are used in frequency converters and switched mode power supplies to attenuate common-mode interference. Common-mode currents are the main cause of conducted and radiated interference.
The customer can choose from a broad spectrum of types. If necessary, application-specific proposed solutions can be designed.
The following physical material and construction element properties are the basis for dimensioning:
- Permeability course via the frequency, modulation and temperature
- Saturation induction (also considers temperature dependency)
- Copper losses (considers skin and proximity effect)
- Heat conduction (core, casting compound, housing,…)
- Winding structure and associated parasitic capacities
These determine the application-relevant variables, such as
- Attenuation via frequency, modulation and temperature
- Nominal current
- Maximum permitted unbalance current
- Application temperature range
- geometry / volume
VAC's simulation program can very accurately predict the attenuation for a large number of core materials. Here, it becomes clear that a measurement on a typical common mode choke almost ideally concurs with a simulation.
Read more about Common Mode Chokes
Letztes Update : 02.07.2012
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