Datametrics Corp.

James W Brunelle

Vito J Marchione

A tap-switching circuit for automatically controlling the output voltage of a multi-tap transformer in response to a varying input line voltage and/or system load current demand, includes voltage sensing circuitry in parallel with both the transformer voltage outputs and a voltage comparator for sensing changes in the system load demand requirements. A voltage reference is provided for automatically generating a pre-selected voltage reference level signal for the line and/or system load requirements. Voltage comparison circuitry is operatively connected with the voltage sensing circuitry for generating an enable signal whenever the input line voltage and/or system load current demand requirements sensed by the voltage sensing circuitry falls below the pre-selected voltage reference level signal. A switching circuit is operatively connected to the voltage comparison circuitry, a linear regulator and to at least two taps of the multi-tap transformer for connecting the higher voltage tap to supply a pre-regulator voltage to the linear regulator whenever the enable signal is present, and for disconnecting the higher voltage tap from supplying its pre-regulator output voltage whenever the enable signal is absent.

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Granada Hills, CA, United States of America

James W Brunelle