hi,
if you are referring to my project of "more efficient relay driving topology", then this is not rocket science. it is good old fashion engineering, as stated in the project the old pin ball machines, and in avionics in many aircraft, the designers were aware of the "airgap" overkill that was needed to turn a relay on. however once it is "on" there is no air gap, magnetic force increases exponentially with the decrease of distance, therefore once the relay is "on" you need less current. this is an electronic equivalent of the double "pull"and"hold" coil or the dc chopper circuit used in other designs. So to answer the question it is much more efficient than the conventional way. It was shared for two reasons A) for designers who are limited to Supply, heat dissapation.............. B)to encourage contactor designers to look into this topology to see if it was viable.
