Speeding up a relay - zero crossing detection
Wagner Lipnharski email (remove spam text)
What about using two relays?
The first idea was to feed power to the load only when Relay#1 is not
energized and Relay#2 is energized, power would flow by both relays
contacts, so, energizing Relay#1 (that you can do in 4ms), will cut power
to the load and would release Relay#2 from auto-sustain. This would be
something like Set/Reset flip-flop using relays. But here you need a
zero-crossing detector to sync the operation.
The second idea was to use the Relay#1 to switch Relay#2 coild feed power
from DC to AC rectified non filtered lower voltage, so, when Relay#1
energizes, the Relay#2 will still energized (auto-sustainned) as long the
semi-senoid holds power to it. When the senoid drops its voltage to a very
low level (around 160 degrees or less), Relay#2 will release armature and
also will interrupt its own sustain. With some sort of luck it could
release power from the load very close to zero-crossing without any
external sync. You could call this a "line sync shut off".
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