Digital processing system for time-of-day and demand meter display

A digital processing A.C. electric energy metering and display system comprising:

• a kilowatthour meter comprising a transparent cover and a rotary disc and means responsive to the voltage and current on an A.C. power line for rotating said disc in accordance with the electric energy usage at a consumer station supplied by said power line so that each rotary increment of said disc represents a predetermined quantity of A.C. electric energy, said disc having a mark thereon that is detected when it has moved through said rotary increment to reach a given point;
• a radiant energy detector having means for monitoring said given point without imposing any forces on said meter disc so as not to effect disc calibration or metering accuracy and for providing an input electric signal each time said mark passes said given point for use in said system;
• mounting means on said meter for mounting said radiant energy detector in proper orientation with respect to said disc within said transparent cover so as to detect said mark as it passes said given point;
• a plural digit electronic display and means supporting the same on said mounting means so that it can be viewed through said transparent cover of the meter;
• a microcomputer comprising:
• memory means for storing data;
• a program stored in said memory means;
• a microprocessor connected to said memory means;
• and output port means for outputting data to said display in said meter under the control of said microprocessor;
• timing signal interfacing means responsive to said power line voltage frequencey for providing timing pulses including means providing a predetermined number of logic level time-keeping pulses per second to said microprocessor;
• control means comprising energy signal interfacing means responsive to said input electric signal from said meter disc mark detector and comprising also said micro-processor responsive to said time-keeping pulses and said program for calculating the day of the week, the time of day, the total watthours and/or kilowatthours of energy used, and the peak interval watthours and/or kilowatthours used and for registering the same;
• said control means also comprising peak demand means responsive to said input electric signal from said meter disc mark detector and said time-keeping pulses and said program for calculating the peak power demand in kilowatts during one of a multiplicity of demand periods of predetermined programmed length and the day of the week and time of such peak power demand and for registering the same for display;
• and said control means comprising means for sequentially transferring data including said total watthours and/or kilowatthours and said peak interval watthours and/or kilowatthours and said peak demand kilowatts and said day and time of peak demand to said plural digit electronic display along with respective identification numbers separated therefrom on said display in a predetermined automatic manner.