G - Physics – 05 – D
Patent
G - Physics
05
D
341/20
G05D 23/19 (2006.01) G05B 11/32 (2006.01)
Patent
CA 1065035
ABSTRACT OF THE DISCLOSURE A control system for energizing and de-energizing an external load in series with a source of electricity incorporates a rectifying net- work 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 nighttime when the lights in the room have been extinguished.
251898
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