Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1978-08-10
1984-01-17
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
236 47, 236 68B, 236 78A, 307308, 307310, 307311, 361165, 361175, H01H 4726
Patent
active
RE0315028
ABSTRACT:
A control system for energizing and de-energizing an external load in series with a source of electricity incorporates a rectifying network having inputs in series with the alternating current source and the external load. An electronic switch of the system activates the load by effectively shorting together the inputs to the control system when the combination of externally sensed parameters obtain predetermined magnitudes. The sensed parameters control the activation of the electronic switch by a plurality of control modules which interact with a control logic module, representing a Boolean combination of the control module outputs, so as to activate a trigger module which in turn causes the electronic switch, such as a silicon controlled rectifier (SCR) to be triggered. The external load is then energized by the SCR effectively shorting the inputs to the control system and which thus completes the electrical path from the source of electricity through the load. The control modules may optionally be connected to external control signals for their activation or de-activation and may also incorporate a hysteresis effect with respect to the sensed parameter. In a preferred embodiment of the present invention, the control system senses temperature and light, so as to override an existing furnace thermostat switch during the day and other times when the room is lighted and to return furnace control to the thermostat switch at some other, lower, temperature during the night-time when the lights in the room have been extinguished.
REFERENCES:
patent: 3149224 (1964-09-01), Horne et al.
patent: 3352490 (1967-11-01), Dalzell et al.
patent: 3408506 (1968-10-01), Bergsma
patent: 3503261 (1970-03-01), Riester et al.
patent: 3716188 (1973-02-01), Shulz
patent: 3918636 (1975-11-01), Dawson
"Transistor Power Supply has Overload Protection"-Ervin, Electronics, 6/20/58, pp. 74-75.
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