Patent ID: 7816894

Claim:
An AC voltage regulator providing a specific desired voltage output, comprising: (a) a power source input suitable to being electrically connected to an AC power source; (b) a load output suitable to being electrically connected to a load; (c) a power circuit comprising a regulator transformer having a primary winding and a secondary winding, wherein said secondary winding is connected in series with the power source input and the load output, and said primary winding is connected with the power source input such that the primary winding and the secondary winding have opposite polarities, wherein said power circuit is configured to perform voltage regulation without any output power interruptions during any transition time, without distortion of AC sine waves, and without high current circulating through circuit components during transient; and (d) a control circuit in electrical communication with the power source input and the power circuit for monitoring an input voltage entering the AC voltage regulator from the AC power source and initiating appropriate voltage switching in the power circuit resulting in a voltage output within a predetermined range, wherein the control circuit comprises: (1) a voltage sensor comprising a step-down transformer, a diode bridge and an unbalanced resistive bridge; (2) a first and second relay coil; and (3) a microcontroller coupled to the AC power source, said microcontroller having an input and an output, wherein an input of the voltage sensor is connected via a protection circuit to the AC power source and to an input of the secondary winding of the regulator transformer; an output of the voltage sensor is connected to the microcontroller input; the microcontroller output is coupled to the first and second relay; and the first and second relay are further coupled to a common return.