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Relative to the steady-state voltage when the switch is on, when the switch goes off, the spike will go positive for low side switches and negative for high side switches. This is why you generally see a reverse-biased diode across the inductor. The diode will be briefly forward-biased when the switch goes off, conducting the current that continues to flow in the inductor until the magnetic field has collapsed. This clamps the voltage across the inductor, protecting the switch from overvoltage.Could you please provide me with an article which explains the difference between high side switch and low side switch, regarding the sign of the spikes that are created on the switch when the it switches the coil?
Thanks.
Relay coils have significant inductance, but I have never seen it specified in a datasheet.Thanks,
When you speak about resonance, what is the frequency that you consider?
I mean we're talking about a DC circuit, execpt for the switching part, so what is the frequency you're talking about?
For the low side switch:Thank you very much.
The capacitor was the reason for seeing a negative peak on the Low Side switch?
How come please?
Thanks for the great effort!