Patent ID: 8035358

Claim:
A voltage regulator, comprising: a first buck-boost transformer having a primary winding and a secondary winding, said secondary winding of said first buck-boost transformer electrically disposed between an alternating current source and a load and in series with said source; a first plurality of control switches configured to control a first voltage across said primary winding of said first buck-boost transformer at a moment in time; a second buck-boost transformer having a primary winding and a secondary winding, said secondary winding of said second buck-boost transformer electrically disposed between said source and said load in series with said secondary winding of said first buck-boost transformer; a second plurality of control switches configured to control a second voltage across said primary winding of said second buck-boost transformer at said moment in time; and, a controller configured to determine an output voltage and to generate control signals for said first and second pluralities of control switches in response to said output voltage wherein said first buck-boost transformer is configured to generate a first voltage level change in voltage between said source and said load, said second buck-boost transformer is configured to generate a second voltage level change in voltage between said source and said load, said second voltage level change different from said first voltage level change, and said first and second voltages are capable of assuming opposite polarities at said moment in time.