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RC Snubber Resonant Design
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2009-11-28
李勇
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RC Snubber Resonant Design
An RC snubber is just a resistor and capacitor in series that damps out
the oscillations occurring when a switched inductive circuit turns off.
How this is supposed to work is that the snubber capacitance forms a
resonant tank circuit with the inductance, the resistor absorbs the
tank’s energy, and the oscillations damp out quickly.
In practice, snubber circuits tend to be ill-designed, simply because it
seems there’s no good way to measure the actual inductance and stray
capacitance at the switch. Folks tend to apply a 100-ohm resistor and a
100 nF capacitor and hope for the best. Sometimes that works. Most of the
time it’s suboptimal.
An RC snubber is just a resistor and capacitor in series that damps out
the oscillations occurring when a switched inductive circuit turns off.
How this is supposed to work is that the snubber capacitance forms a
resonant tank circuit with the inductance, the resistor absorbs the
tank’s energy, and the oscillations damp out quickly.
In practice, snubber circuits tend to be ill-designed, simply because it
seems there’s no good way to measure the actual inductance and stray
capacitance at the switch. Folks tend to apply a 100-ohm resistor and a
100 nF capacitor and hope for the best. Sometimes that works. Most of the
time it’s suboptimal.
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