Circuitry for load connection and disconnection
OwnerFrederick H. Edwardsinventor
Life of this patent
Estimating the term…
Abstract
This invention relates to circuitry for the connection of a load to and disconnection of a load from an AC power source. The circuitry is specifically useful in the on/off control of such as incandescent lamps, but not exclusively so, and provides for the timed disconnection of a load when the load is connected in series with the circuitry and AC power source, or alternately provides for the timed reduction of power delivered to the load.
Claims18
In a circuit device for connection in series with a load and an AC power source such that power is delivered to the load during both positive and negative half-cycles and for the automatic disconnection of the load after a predetermined time interval, with the timing interval being variable over a period ranging from a few minutes to several hours and without restriction to a single value, the improvement comprising:
- output thyristor means for providing a conductive path for the load current, means connected to and controlling the output thyristor means for achieving conduction or nonconduction of the output thyristor means, timing circuit means connected to the controlling means for timing the automatic timing interval and including means for initiating or interrupting the automatic timing interval, means connected to the timing circuit means for changing the duration of the automatic timing interval, circuit voltage means for deriving a DC control voltage supply from the AC power source during periodic time intervals within the automatic timing interval when the output thyristor means is nonconductive, and means for providing the periodic time intervals during the automatic timing interval when the output thyristor means is nonconductive.
In a circuit device for connection in series with a load and an AC power source such that power is delivered to the load during both positive and negative half-cycles and for the automatic reduction of the load after a predetermined time interval, with the timing interval being variable over a period ranging from a few minutes to several hours and without restriction to a single value, the improvement comprising:
- output thyristor means for providing a conductive path for the load current, means connected to and controlling the output thyristor means for achieving conduction or nonconduction of the output thyristor means, means for adjustment of the reduced-load conduction of the output thyristor means, timing circuit means connected to the controlling means for timing the automatic timing interval and including means for initiating or interrupting the automatic timing interval, means connected to the timing circuit means for changing the duration of the automatic timing interval, circuit voltage means for deriving a DC control voltage supply from the AC power source during periodic time intervals within the automatic timing interval when the output thyristor means is nonconductive, and means for providing the periodic time intervals during the automatic timing interval when the output thyristor means is nonconductive.
In a circuit device for connection in series with a load and an AC power source such that power is delivered to the load during both positive and negative half-cycles and provision is made for a choice between automatic timed disconnection of the load and automatic timed reduction of the load to some reduced load value and ordinary on/off control of power to the load, with neither the timed interval nor the reduced load value, being restricted to a single value but with the timed interval being variable over a period ranging from a few minutes to several hours, the improvement comprising:
- output thyristor means for providing a conductive path for the load current, means connected to and controlling the output thyristor means for achieving conduction or nonconduction of the output thyristor means, means for adjustment of the reduced-load conduction of the output thyristor means, timing circuit means connected to the controlling means for timing the automatic timing interval and including means for initiating or interrupting the automatic timing interval, means connected to the timing circuit means for changing the duration of the automatic timing interval, circuit voltage means for deriving a DC control voltage supply from the AC power source during periodic time intervals within the automatic timing interval when the output thyristor means is nonconductive, and means for providing the periodic time intervals during the automatic timing interval when the output thyristor means is nonconductive.
Dependencies are inferred from the claim text.