Patent ID: 7759959
Filing Date: 2010-07-20
Classification: G01R

Abstract:
1. A voltage transformer circuit comprising: a primary winding around a core of a first transformer; a primary winding around a core of a second transformer, the first and second transformer primary windings being coupled to receive a voltage to be sensed; a secondary winding around the core of the first transformer, the secondary winding of the first transformer being coupled to a first output terminal; a secondary winding around the core of the second transformer, the secondary winding of the second transformer being coupled to the first output terminal; and a bridge circuit coupled to the secondary windings of the first and second transformer and to a second output terminal, wherein said bridge circuit comprises a first resistor and a second resistor, said first resistor having a first and second end, said first end of the first resistor coupled to the secondary winding of said first transformer and said second resistor having a first and second end, said first end of the second resistor coupled to said secondary winding of said second transformer and said second end of the first resistor and said second end of the second resistor coupled to a second output terminal.