System for use with a utility meter for recording time of energy use

• US 4,792,677 A
• Filed: 08/29/1986
• Issued: 12/20/1988
• Est. Priority Date: 08/29/1986
• Status: Expired due to Term

• Current Assignee: Cellnet Innovations, Inc.
• Original Assignee: Domestic Automation Company Incorporated
• Inventors: Johnson, Larsh M., Edwards, Cree A.
• Primary Examiner(s): Nelms, David C.
• Assistant Examiner(s): Allen, Stephone B.
• Application Number:
  US06/902,161
• Time in Patent Office: 844 Days
• Field of Search: 250/231 SE, 340/870.02, 340/870.28, 340/870.29, 364/483, 324/116
• US Class Current: 250/231.13
• CPC Class Codes: G01R 11/04 Housings; Supporting racks; Arrangements of terminals
• CPC Class Codes: G01R 21/133 by using digital technique

Abstract

A system for use with standard electric meters having a rotatable disc for recording time of energy use. The system includes a housing securable within a meter below the disc. The system also includes sensor means within the housing for detecting rotation of the disc and generating a signal in response thereto. Circuit means are included within the housing to process and store the signal for calculating time of energy use information. The housing also includes a communication circuit means for transmitting the time of energy use information to a location external of the meter.

Claims

1. A system for use with a watt-hour meter having a rotatable disc for recording energy use, comprising:

a housing configured to fit within the meter below the disc and securable therein;

sensor means located within said housing for detecting rotation of the disc and generating a signal in response thereto;

an optical sensor port in the top surface of said housing through which said sensor means may detect rotation of the disc;

circuit means within said housing for processing and storing said signal for calculating time of energy use information; and

communication circuit means within said housing for optically transmitting said time of energy use information to a location external of the meter.

2. The system of claim 1 further including reader means for optically communicating with said communication circuit means to collect said time of energy use infomation for calculation of a rate charge.

3. The system of claim 1 wherein said sensor means comprises first and second light emitting diodes for directing light toward the disc, and first and second phototransistors responsive to a change in the reflective index of the disc.

4. The system of claim 3 wherein said first and second light emitting diodes are operated intermittently.

5. The system of claim 1 wherein said communication circuit means includes a light emitting diode and a phototransistor for infrared serial communication of data.

6. The system of claim 1 wherein said circuit means includes a microprocessor and means for deriving clock pulses from a power supply for said microprocessor so that said microprocessor is clocked in synchronization with the power supply.

7. The system of claim 6 wherein said circuit means further includes a backup source of power for operation of said microprocessor should the power from the power supply drop below a predetermined value.

8. A system for recording time of energy use for use with standard electric meters having a rotatable disc and a substantially optically transparent cup-shaped cover securable to a base to provide an enclosure, comprising:

a housing configured to fit within the cover of any standard electric meter below the disc and securable therein;

sensor means located within said housing for detecting rotation of the disc and generating a signal in response thereto, said housing including an optical port in the top surface thereof through which said sensor means detects said rotation;

circuit means including a microprocessor in said housing for receiving said signal for counting rotations of the disc during an interval of time, determining time of energy use information and storing the same;

a display means on a front face of said housing and visible through the cover for displaying time of energy use information;

communication circuit means included in said housing and connected in circuit with said circuit means for optically transmitting said time of energy use information through the cover to a location external thereof;

an optical data port in the front face of said housing for establishing optical communication between said communication circuit means and said external location; and

power supply circuit means within said housing for supplying power to said circuit means and said communication circuit means.

9. The system of claim 8 further including a reader means positionable externally of the cover for optically communicating with said circuit means via said communication circuit means for collecting said time of energy use information for calculation of a rate charge for energy use based thereon.

10. The system of claim 9 wheein said reader means may be programmed for different rate structures in calculating the rate charge.

11. The system of claim 9 wherein said reader means includes a suction head means that is attachable to the cover for establishing an optical communications link between said reader means and said communication circuit means.

12. The system of claim 8 wherein said circuit means includes a read-only memory for storing a program to control the operation of the microprocessor and a random-access memory for storing said time of energy use information.

13. The system of claim 8 or 9 wherein said communication circuit means includes a light emitting diode and a phototransistor for infrared serial communication of data through said optical data port.

14. The system of claim 8 wherein said circuit means includes means for deriving clock pulses from a power supply so that said microprocessor is clocked in synchronization with the power supply.

15. The system of claim 8 wherein said circuit means further includes a backup source of power for operation of said circuit means should the power from the primary power supply drop below a predetermined value.

16. The system of claim 13 wherein said reader means includes a light emitting diode and a phototransistor for said infrared serial communication of data.

17. The system of claim 14 wherein said circuit means includes means for providing clock pulses to said microprocessor should power from the main power supply drop below a predetermined value.

18. The system of claim 15 wherein said backup source of power includes a capacitor circuit.