Apparatus for control of load power consumption
First Claim
1. An apparatus for selectively reducing the voltage applied from an input to a load in an AC power system of the type having an AC common, the apparatus comprising:
- an autotransformer having a series winding and a common winding, the series winding being connected between the input and the load, the common winding being connected between the load and AC common, anda switching device connected in series with said common winding for preventing the flow of current in said common winding for applying full voltage to said load, and for permitting the flow of current in said common winding for reducing the voltage to said load, said switching device being electrically isolated from said AC common by at least a portion of said common winding.
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Accused Products
Abstract
An apparatus for reducing the voltage applied to a load in an AC system utilizes an autotransformer and a relay or equivalent switching device between the common winding and the series winding. In each of the AC lines, the common winding and relay are connected between the load and the AC common while the series winding is connected between the input and the output. The relay is normally open to pass substantially full input voltage to the load, but when closed the relay permits current flow in the common winding to reduce voltage to the load. The relay or equivalent switching is therefore not in the direct flow of load current and can be of lower current rating and smaller size and cost as compared to prior art voltage reduction systems.
86 Citations
10 Claims
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1. An apparatus for selectively reducing the voltage applied from an input to a load in an AC power system of the type having an AC common, the apparatus comprising:
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an autotransformer having a series winding and a common winding, the series winding being connected between the input and the load, the common winding being connected between the load and AC common, and a switching device connected in series with said common winding for preventing the flow of current in said common winding for applying full voltage to said load, and for permitting the flow of current in said common winding for reducing the voltage to said load, said switching device being electrically isolated from said AC common by at least a portion of said common winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for selectively reducing the voltage applied from an input to a load in an AC power system of the type having an AC common, the apparatus comprising a switching device connected between the load and AC common for reducing the voltage applied to the load without passing full load current, the switching device being isolated from AC common by at least a portion of the common winding of an autotransformer.
Specification