Load-control system with two-conductor supply circuit

Details Load-control system with two-conductor supply circuit Load-control system with two-conductor supply circuit

1981-10-23

1983-12-13

Goldberg, Elliot A.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

236 47, 236 46R, 307117, 307141, F23N 520, G05D 2300

Patent

active

044206933

ABSTRACT:
A system for the control of a load such as a heating or cooling plant in response to changes in an external parameter, specifically ambient temperature, comprises a loop circuit with two conductors connected at an input end across a power supply and at an output end across a switching network, the load being inserted in one of these conductors. A high-impedance voltage multiplier connected across these conductors downstream of the load, in parallel with the switching network, supplies the necessary operating voltage to a parameter sensor such as a thermostat even when that network is in a low-impedance state so as to draw a maximum load current. The switching network may include a voltage clamp provided with a source of reference potential, e.g. a primary battery, which upon failure of the normal power supply can act as a standby supply insuring continued operation of a timer serving for a periodic switchover between different temperature thresholds for the thermostat.

REFERENCES:
patent: 3948441 (1976-04-01), Perkins et al.
patent: 4029937 (1977-06-01), Russell
patent: 4236084 (1980-11-01), Gingras
patent: 4268899 (1981-05-01), Rokas
patent: 4344071 (1982-08-01), Allen
patent: 4365167 (1982-12-01), Weimer et al.

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