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US 2003/0151482 A1Published application
Wide ratio autotransformer-type current ranging
AssigneeRadian Research, Inc.
InventorGlenn A Mayfield
Life of this patent
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AssigneeRadian Research, Inc.
InventorGlenn A Mayfield
Estimating the term…
A transformer (90) includes taps (96a, 96b, 96c) by which electrical contact can be made to a winding (90) of the transformer (90) at locations along its length between its end terminals. A first section (90a) of the winding (90) has a first resistance R1 (R). A second section (90a+90b) of the winding (90) has a second resistance R2 (R+3R). One or both of the first (90a) and second (90a+90b) sections can be a multilayer section. The sections are configured so that one of the ratio R1:R2 (1:4) and the ratio R2:R1 (4:1) is substantially identical to the ratio 1:n (1:4) of the windings (90a, 90a+90b). A first switch (94) permits contact to be made selectively to a selected one of the taps (96a, 96b, 96c). An amplifier (98) has an inverting (−) input terminal, a non-inverting (+) input terminal and an output terminal. One (+) of the + and − input terminals is coupled to one of the terminals (end terminal of winding 90a) of the winding (90). In one embodiment (without switch 92, and with the configuration illustrated in FIG. 8), the other (−) of the + and − input terminals is coupled to the output terminal of the amplifier (98). In another embodiment, a second switch (92) also permits contact to be made selectively to a selected one of the taps (96a, 96b, 96c). The other (−) of the + and − input terminals is coupled to the other terminal (end terminal of winding 90c) of the winding (90). The output terminal of the amplifier (98) is coupled to the first switch (94) so that selectively making contact with one of the taps (96a, 96b, 96c) couples the selected tap (96a, 96b, 96c) to the output terminal of the amplifier (98).
A transformer circuit including a winding having a pair of terminals and taps by which electrical contact can be made to the winding at locations between the terminals along its length, a first switch for selectively making contact to a selected one of the taps, a second switch for making contact to a selected one of the taps, an amplifier having an inverting (−) input terminal, a non-inverting (+) input terminal and an output terminal, the + and − input terminals coupled across the pair of terminals of the winding, and the output terminal of the amplifier coupled to one of the first and second switches so that selectively making contact with one of the taps couples the selected tap to the output terminal of the amplifier.
A transformer circuit including a winding having a pair of terminals and taps by which electrical contact can be made to the winding at locations between the terminals along its length, a switch for selectively making contact to a selected one of the taps, an amplifier having an inverting (−) input terminal, a non-inverting (+) input terminal and an output terminal, one of the + and − input terminals coupled to one of the terminals of the winding, and the other of the + and − input terminals coupled to the output terminal of the amplifier.
A transformer having first and second windings having a turns ratio 1:n, the first winding having a first resistance R1, the second winding having a second resistance R2, at least one of the first and second windings being a multilayer winding, the first winding and the second winding being configured so that one of the ratio R1:R2 and the ratio R2:R1 is substantially identical to the ratio 1:n.
Dependencies are inferred from the claim text.