Voltage selection apparatus and methods

Electric power conversion systems – Current conversion – With means to connect the input to diverse power sources

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323255, H02M 110, G05F 114

Patent

active

061082260

ABSTRACT:
The apparatus and methods of the invention provide conversion of a wide range of utility voltages found worldwide, to a fixed nominal voltage level. The invention therefore provides the ability to "plug in" to virtually any power source, and produce a desired nominal voltage for operation of electrical equipment either alone or in conjunction with a UPS device. The voltage selection apparatus provides standard nominal levels of electrical power to equipment while utilizing power sources of varying voltage and frequency. The device is dynamically adaptive to the input power source, and maintains its output within a nominal range even where the input source varies to a substantial degree. The voltage selection apparatus comprises an input for receiving input AC voltage from a power source, and a transformer to produce an output voltage which is coupled to the input. The transformer has at least one winding and a predetermined plurality of winding taps used to achieve a desired nominal output voltage from the transformer. A voltage detector is coupled between the input and the transformer to selectively measure the input voltage and enable output of a selected nominal output voltage. A control circuit monitors the input voltage to produce control signals in response thereto, and relay devices are controlled to select a predetermined winding tap based upon the input voltage to produce an output from the transformer within a desired nominal voltage range.

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