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AC to DC Converter

IP.com Disclosure Number: IPCOM000096607D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Thomas, E: AUTHOR

Abstract

The apparatus converts varying AC input voltages to smooth DC output voltages by controlling the transformer secondaries activated at any given moment. Three input transformers T1, T2 and T3 each receive a phase of the AC input. The output from T1, T2 and T3 is supplied to a common load resistance R through silicon control rectifiers SCR 1...6. Interposed between the SCR's and load R are logic devices for controlling the conduction of the SCR's.

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AC to DC Converter

The apparatus converts varying AC input voltages to smooth DC output voltages by controlling the transformer secondaries activated at any given moment. Three input transformers T1, T2 and T3 each receive a phase of the AC input. The output from T1, T2 and T3 is supplied to a common load resistance R through silicon control rectifiers SCR 1...6. Interposed between the SCR's and load R are logic devices for controlling the conduction of the SCR's.

The logic devices are so connected as to respond to variations in the AC input according to predetermined criteria. As the AC input experiences discrete variations, the logic devices activate corresponding finite combinations of the SCR's. The effective length of the T1, T2 and T3 secondary windings is thus controlled. Optimum lengths are selected to given AC input variations. The output voltages of T1, T2 and T3 are summed and the DC output is, therefore, maintained constant.

The logic devices employed are either self-contained electronic circuitry or manually controlled switches, the choice depending on the output stability desired.

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