Wagner Lipnharski <wagner@USTR.NET> wrote:
> Supposing it could be possible, what would happens if you wrap a secondary
> coil (with the diode) around the actual relay coil?
> All the magnetic collapsing field would be drained by this secondary coil
> in short (by the diode), with few energy generated at the primary coil, is
> this correct or not?

Although the shorted secondary would effectively "kill" the inductance of
the primary for the switch-off transition, eliminating the voltage dump
into the switching device, the pulse of current in the secondary would
create a magnetic field of its own (opposite in polarity from the original)
until it decays. The actual turn-off time of the relay would be essentially
unchanged, and this is what we were trying to improve.

-- Dave Tweed

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