FEED FORWARD AC VOLTAGE REGULATOR EMPLOYING STEP-UP, STEP-DOWN TRANSFORMER AND ANALOG AND DIGITAL CONTROL CIRCUITRY

摘要

-22-AbstractFeed Forward AC Voltage Regulator EmployingStep-Up, Step-Down Transformer andAnalog and Digital Control CircuitryA feed forward AC voltage regulator utilizesa step-up, step-down transformer to apply adjust-ment voltages to an unregulated AC line. Analogcircuitry periodically samples the unregulated ACline input and compares it with a scaled represen-tation of the desired line voltage. Digitalcircuitry converts the information from the analogsampling and comparison to an instruction commandwhich activates an appropriate solid state switchassociated with a tap on a multitap transformerconnected to the regulated AC output line. Thetaps are successively located on the multitaptransformer to provide selectable adjustmentvoltages of various values. The switched-inadjustment voltage is provided the proper polarityand applied to the primary of the step-up, step-down transformer, thereby applying to the secondarythe adjustment voltage needed to move the regulatedAC output line to the desired level.