Pulse ratio system

• US 5,023,822 A
• Filed: 10/31/1988
• Issued: 06/11/1991
• Est. Priority Date: 10/31/1988
• Status: Expired due to Fees

• Current Assignee: ABB Power T&D Co Inc (ABB Limited)
• Original Assignee: ABB Power T&D Co Inc (ABB Limited)
• Inventors: Schlotterer, John C., Johnston, Paul M., Rusnak, Mark F., Pillage, Lawrence T., Byrd, Thomas M. Jr.
• Primary Examiner(s): Gruber, Felix D.
• Application Number:
  US07/264,582
• Time in Patent Office: 953 Days
• Field of Search: 364/464.04, 364/703, 364/565, 377/47, 318/570
• US Class Current: 708/103
• CPC Class Codes: G01R 21/133 by using digital technique

Abstract

A programmable system for providing a programmable ratio of output pulses to input pulses. The programmable system receives pulses from an electric power meter and outputs a programmable number of pulses representing a number of kilowatt hours consumed. Various electric power meter disk patterns can be processed by the programmable system. The programmable ratio can be applied via input pins and/or via an external memory.

Claims

1. A programmable system connectable to receive pulses representing a pattern on a rotatable disk comprising:

pulse receiving means for receiving the pulses, for detecting a direction of rotation of the disk and for providing motion signals in dependence upon said detecting;

register means for receiving control parameters, for storing said parameters and for providing a plurality of parameter outputs responsive to said control parameters;

ratio means for receiving said motion signals and for providing ratio signals responsive to said motion signals and to a ratio of a first group of said parameter outputs to a second group of said parameter outputs; and

output means for providing output drive signals responsive to said ratio signals and in accordance with a third group of said parameter outputs and said direction of rotation detected by said pulse receiving means.

2. A programmable system according to claim 1, wherein said ratio means comprises:

multiplier means for multiplying said motion signals in accordance with said first group of said parameter outputs and for providing multiplier signals being responsive to said multiplication; and

divider means for dividing said multiplier signals in accordance with said second group of said parameter outputs and for providing said ratio signals being responsive to said division.

3. A programmable system according to claim 1 operatively connectable to a non-volatile memory, wherein said register means includes:

initialization means, operatively connected to receive a program input and a mode input, for programming the non-volatile memory to store said control parameters in response to said program input and for providing, in accordance with said mode input, one of said received control parameters and said control parameter stored in the non-volatile memory as said parameter outputs.

4. A programmable system according to claim 1, wherein said output means comprises:

means for storing said ratio signals and for generating forward and reverse output drive signals based on said ratio signals and said direction of rotation detected by said pulse receiving means; and

limiting means for limiting said generation of said forward and reverse output drive signals to a predetermined level in accordance with said third group of parameter outputs.

5. A programmable system according to claim 1 further comprising:

clock sequencer means, operatively connected to receive a reset signal, for synchronizing operation of said programmable system, for providing a signal to reset said programmable system in response to said received reset signal, and for providing a direction output based on said direction detected by said pulse receiving means.

6. A programmable system according to claim 5 further comprising:

output terminals;

test means, operatively connected to receive a test input signal, for testing operation of said programmable system in response to said test input signal and in accordance with a portion of said first group of parameter outputs, and for multiplexing tested signals to some of said output terminals in accordance with said portion of said control first group of parameter outputs.