Communications: electrical – Continuously variable indicating – With meter reading
Patent
1983-05-27
1987-11-24
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With meter reading
34082557, 3075421, H04Q 100
Patent
active
047092335
ABSTRACT:
A single line pair power control system is disclosed and consists of a reflex module supplying direct current of a first or a second polarity to the control line pair. The polarity of the reflex module reverses in response to a drop in the voltage between the control lines. One or more command modules may be connected between the control lines for short circuiting the two lines to thereby cause polarity reversal of the reflex module. One or more power control relays may be connected to the control lines, such that the relay switch ON for one polarity state of the control lines and are switched off for the opposite polarity of the control lines, thereby controlling power to a load. Also disclosed are an extender module for extending the length of the control lines beyond the length that can be driven by the reflex module, and override circuits for disabling the operation of the command modules, and a special interface which allows control of the reflex module through logic level signals.
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Hill et al, "Switching Theory and Logical Design", John Wiley and Sons, New York, 1974, pp. 71-77.
Epstein Natan
Jagger Bruce A.
Weldon Ulysses
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