Patent ID: 6734784
Filing Date: 2004-05-11
Classification: H02J,H04B,H05B,Y02B,Y02E,Y04S

Abstract:
A powerline pulse position modulated communication transmitter comprising:first and second connections for connecting to an AC powerline; a chargeable capacitor and a switch in series therewith coupled to said first and second connections for connection in parallel to the powerline; a digital control IC; a zero voltage crossing detector circuit coupled to said first and second connections and to said connected to said digital control IC; and a signal source to actuate said digital control IC, said digital control IC being coupled to said switch in series with said capacitor to actuate said switch in one of a predetermined number of a plurality of signal timing positions referenced to the zero voltage crossing time and located within a predetermined time range after the peak of the cycle but before the zero voltage crossing time and not at the zero voltage crossing time to discharge said capacitor into the powerline to produce a signal pulse in the powerline in said one of said signal time positions.