Electrical transmission or interconnection systems – Plural load circuit systems – Selectively connected or controlled load circuits
Patent
1995-02-27
1996-10-08
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural load circuit systems
Selectively connected or controlled load circuits
307 38, 364273, 3642731, 3642732, 3642733, 3642734, 3642735, H02J 314
Patent
active
055634559
ABSTRACT:
Methods and apparatus for operating a power sequencer/controller system are disclosed. In a typical operation, an AC power sequencer/controller of the present invention senses the current through a first outlet connected to a first load, and when the current through the first outlet exceeds a first threshold voltage, indicating that the first load is turned on, the AC power sequencer/controller provides power to a second outlet so that a second load connected to the second outlet can be turned on. A power sequencer/controller of the present invention includes at least (a) a master outlet for coupling to a first load, (b) a current sensor for sensing the current through the master outlet and for coupling to a power source, (c) a switch controller for receiving a signal from the current sensor, a DC power supply or an input from a second power sequencer/controller, (d) a switch controlled by the switch controller and for coupling to the power source, and (e) a slave outlet coupled to the switch and for coupling to a second load. Multiple power sequencers/controllers can be also cascaded. While a master outlet may be always powered, a slave outlet of a power sequencer/controller can be either always powered, controlled (a) by one of the master outlet or a slave outlet of the same power sequencer/controller or (b) by a master outlet or a slave outlet of another power sequencer/controller in a cascaded system.
REFERENCES:
patent: 3521130 (1968-03-01), Davis
patent: 3723827 (1973-03-01), Griswold et al.
patent: 3725675 (1973-04-01), Olsen
patent: 3729671 (1973-04-01), Jeffery et al.
patent: 4890212 (1989-12-01), Kumon et al.
LM 1851 Ground Fault Interrupter, National Semiconductor Corporation.
Paladini Albert W.
Shoop Jr. William M.
Sun Microsystems Inc.
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