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Method and system of selective disconnection of loads from a power source

  • US 4,208,593 A
  • Filed: 02/13/1978
  • Issued: 06/17/1980
  • Est. Priority Date: 02/13/1978
  • Status: Expired due to Term
First Claim
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1. A system for controlling the disconnection of a load from a source of power as a function of a predetermined condition relating to power usage and as a function of time, the system comprising:

  • means connected to the load for selectively disconnecting the load from the source of power in response to a control signal assuming a disconnecting value;

    a source of a first control signal that selectively assumes said disconnecting value in response to the predetermined condition;

    a source of a second control signal that is fixed at said disconnecting value;

    timing means for generating an enabling signal indicating a predetermined time period;

    selector means for selecting between first and second modes of operation of said system;

    switching means connected to said selective disconnecting means and said selector means, said switching means receiving said first and second control signals and said enabling signal, said switching means applying said first control signal to said disconnecting means in response to said selector means selecting either of said first or second modes of operation and said enabling signal indicating a time outside said predetermined time period, said switching means applying said first control signal to said disconnecting means in response to said selector means selecting a predetermined one of said first and second modes of operation and said enabling signal indicating a time within or outside said predetermined time period, said switching means applying said second control signal to said disconnecting means in response to said selector means selecting the other of said first and second modes of operation and said enabling signal indicating a time within said predetermined time period, whereby the load is disconnected from the source during the entirety of said predetermined time period when said selector means selects said other of the modes and is selectively disconnected in response to said predetermined condition at all times outside said time period as well as at times during said time period when the selector means selects said one of the modes.

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