Communications: electrical – Digital comparator systems
Patent
1976-07-22
1977-12-20
Yusko, Donald J.
Communications: electrical
Digital comparator systems
307 39, 364492, H04Q 900, H02J 1300, G06F 1556
Patent
active
040644855
ABSTRACT:
To maintain power consumption within predetermined limits, the ON/OFF states of a plurality of electrical loads are controlled by a digital load control circuit that forms part of a closed-loop control system. The power consumed by the ON loads is monitored and compared with a reference and in response to such comparison command signals are produced that instruct the digital circuit to add or shed loads as required, to increase or decrease, respectively, the power consumption. Inputs to the load-control circuit are in the form of one or more add or shed command pulses wherein the former instructs the circuit to add a load, and the latter instructs the circuit to shed a load. To execute these commands, the load-control circuit includes a reversible, recycling address generator that successively addresses a bank of addressable latches, one for controlling the ON/OFF state of each load. As the latches are successively addressed, logic circuitry operates to detect a concurrence of an add command and an OFF load state at the addressed latch, or a concurrence of a shed command and an ON load state at the addressed latch. Detection of the former set of conditions causes the then addressed latch to be switched from its load OFF state to its ON state and detection of the latter set of conditions causes the then addressed latch to be switched from its load ON state to its OFF state. Various embodiments of the foregoing are disclosed including circuitry for selectively dividing the plurality of loads into two different groups, one of which is a fixed priority group wherein the loads thereof are added and shed in a fixed order, and the other of which is a rotate group wherein the order that the loads are added and shed is rotated so that all of the loads of such group equally share the available ON time; and circuitry for selecting a limit to the total number of rotate loads that can be ON at any given time and a limit to the number of such loads that can be OFF at any given time.
REFERENCES:
patent: 3339079 (1967-08-01), Kessler
patent: 3714453 (1973-01-01), Delisle et al.
patent: 3789201 (1974-01-01), Carpenter et al.
patent: 3842249 (1974-10-01), Geyer et al.
patent: 3872286 (1975-03-01), Putman
patent: 3906242 (1975-09-01), Stevenson
Pacific Technology, Inc.
Yusko Donald J.
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