Patent ID: 8760150

Claim:
An apparatus for indicating the transfer of electrical power from a source of electrical power that has a sinusoidally-varying cycle, said source providing electrical power to a first power line and a second power line, said apparatus comprising: a controller having a first lead and a spaced-apart second lead, a half wave rectifier in series between said first and said second leads, said half wave rectifier having a conducting state and a non-conducting state, a shunt connected in series with said half wave rectifier and said second lead, a processor electrically connected to said half wave rectifier, a source of direct current to power said processor, said processor triggering said half wave rectifier by a signal to enter said conducting state only near a cross-over point in a positive portion of a cycle of said sinusoidally-varying electrical power source, so that, when said first lead is connected to said first power line from said source and said second lead is connected to said second power line from said source, said half wave rectifier passes current from said first power line through said shunt to said second power line until said half wave rectifier enters said non-conducting state as said source crosses to a negative portion of said cycle, said controller thereby generating a direct current pulse across said first and said second power lines at a frequency consistent with said cycle, said direct current pulse being on any third power line in electrical series with said controller thereby indicating a transfer of power from said first and second power lines to said any third power line.