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how to define maximum switching frequency for inductor

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szhighstar

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how to define maximum switching frequency for inductor
 

BradtheRad

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In general, a high henry value goes with a low switching frequency.

Furthermore if series resistance is low...

Then target amps is high.
Time constant is long (calculated as L / R).
To allow time to get current flowing or declining, will need a low switching frequency.

Example, a 1 mH coil and 1 ohm resistance will take .005 second to reach target current (based on the traditional 5 time constants to fully charge and discharge).

If series resistance is high...

Then target amps is low.
Time constant is short.
Current needs less time to get flowing or to decline.
A higher switching frequency is suitable.

Example, a 1 mH coil and 10 ohm resistance will take .0005 sec to reach target current.
Current will reach 1/10th that of the first example.
 

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