Single line pair power control system with multi-station capability

A reflex circuit comprising amplifier means connected to positive and negative voltage supply rails, an inverting input, a noninverting input and an output voltage of a given polarity referenced to system ground, and means connected between said output and said inputs for reversing the polarity of said output relative to system ground in response to a momentary drop in the voltage difference between said output and system ground.

A control system comprising circuit means including a pair of extended electrical conductors, said circuit means capable of supplying sufficient power for driving one or more relays connected between said conductors remotely of said circuit means, said circuit means maintaining said conductor pair in one of a plurality of relative electrical states, switch means connected between said pair of conductors remotely of said circuit means and actuatable for applying a momentary stimulus to said conductor pair said circuit means changing the relative electrical state of said conductor pair in response to a momentary stimulus applied to said conductor pair and maintaining said changed relative state following removal of said stimulus, said circuit means again changing the relative electrical state of said conductor pair upon subsequent actuation of said switch means such that relay means powered only by said conductor pair and sensitive to such a change in the electrical state of said control lines may be switched between an ON condition and an OFF condition.

A circuit having a pair of extender inputs and a pair of extender outputs, means for maintaining said outputs in a first relative electrical state, first means for changing the relative electrical state of said outputs in response to a momentary change in the impedance between said pair of outputs, second means for momentarily changing the impedance between said inputs responsive to such momentary change in the impedance between said outputs, and third means for changing the relative electrical state of said extender outputs responsive to a change in the electrical state of a pair of control lines connected to said extender inputs, said outputs remaining in said changed state until either a momentary low impedance path is again established between said extender outputs or the electrical sate of said control line pair is again changed, whereupon said first means return said outputs to said first relative electrical state.

A circuit having a pair of inputs and a pair of outputs, means for delivering an electrical voltage of a first or a second relative polarity to said outputs, means for momentarily reversing the relative polarity of said outputs in response to a momentary drop in the voltage difference between said pair of outputs induced by a momentary low impedance path established between said pair of outputs, means for momentarily establishing a low impedance path between said inputs responsive to such momentary change in the impedance between said outputs, and means for stably reversing the relative polarity of said outputs in response to a reversal of the relative polarities of a conductor pair connected to said inputs.

A control system comprising circuit means including a single pair of electrical conductors, a plurality of switches connected between said conductor pair, and one or more relays having relay control inputs connected to said conductor pair, said circuit means being responsive to actuation of any one of said switches for reversibly switching said relays back and forth between an OFF state and an ON state with each actuation of any one of said switches including repeated actuation of the same one of said switches, whereby said one or more relays may be controlled from any one of said switches disposed at geographically spaced locations with only a single conductor pair interconnecting both said switches and said relay control inputs.

A control system comprising reflex circuit means, a single pair of electrical conductors of arbitrary length connected to said reflex circuit means and maintained in one of two relative electrical states by said reflex circuit means, a plurality of control switches connected at arbitrarily spaced intervals to said single pair, said reflex circuit means changing said electrical state of said single pair in response to actuation of any one of said control switches, and one or more relays having relay control inputs connected at arbitrary points to said single pair, said one or more relays being reversibly switchable between an OFF state and an ON state, said one or more relays being switchable from one of said states to the other of said states in response to change of said single pair from one said electrical state to the other through actuation of any one of said control switches, said one or more relays being subsequently returnable from said other state to said one state by actuation of the same or any other of said control switches.

A control system comprising a single pair of electrical conductors of arbitrary length, one or more relays having relay control inputs connected at arbitrary points to said single pair, circuit means delivering a control voltage to said line pair for controlling the state of said relays, and a plurality of control switches connected only between said pair of electrical conuctors at arbitrarily spaced intervals along said single pair, said one or more relays being reversibly switchable from an OFF state to an ON state in response to actuation of any one of said control switches, said one or more relays being subsequently returnable from said ON state to said OFF state by actuation of the same or any other of said control switches, whereby said one or more relays may be controlled from any one of said switches disposed at geographically spaced locations with only a single line pair interconnecting both said switches and said relay control inputs and neithersaid control switches nor said relay control inputs requiring electrical power from a source other than said single pair.

A control system comprising circuit means connected to a single pair of electrical conductors, one or more normally open switches connected between the conductors of said conductor pair, and relay means having relay control inputs connected to said single pair, said reflex circuit means maintaining said relay means in a beginning ON state or OFF state, said reflex circuit means switching the state of said relay means to a changed state in response to momentary closure of any one of said control switches, said reflex circuit returning said relay means from said changed to said beginning state upon subsequent momentary closure of the same or any other of said control switches.

A control system comprising circuit means connected to a single pair of electrical conductors for maintaining a given beginning relative electrical state between said pair of conductors, said circuit means being responsive to the momentary actuation of any one of a plurality of geographically spaced switches connected between the conductors of said single pair by altering said relative electrical state, said circuit means returning said single pair to said beginning state upon subsequent momentary actuation of the same or any other of said switches.

A control system comprising reflex circuit means having a pair of output terminals for delivering an electrical voltage to a pair of electrical conductors of arbitrary length connected to said output terminals and normally presenting a high impedance load to said reflex circuit means, one or more normally open control switches connected between said pair of conductors and being actuatable for establishing a momentary low impedance path between said conductor pair, said reflex circuit means being responsive to said momentary low impedance path by reversing the relative polarity of said electrical voltage, back and forth with each actuation of the same or any other one of said one or more switches and at least one power relay means having control inputs connected to said conductor pair, said relay means being switchable between an ON condition and an OFF condition in response to polarity reversal of said electrical voltage, said control switches and said power control relay means being connected to said conductor pair at arbitrarily spaced apart points along the length of said conductor pair.