Patent ID: 6388451
Filing Date: 2002-05-14
Classification: B60L,B60W,Y02T

Abstract:
A leakage current cancellation device for an electric vehicle comprising:a differential transformer having a first line voltage and a second line voltage passing therethrough, said first and second line voltages being out of phase with each other, said differential transformer having a sense winding whereby a leakage current produces a current imbalance in said differential transformer, said current imbalance produces a potential across said sense winding; a safety ground; means for controlling first and second transistors, said first transistor being connected to said second line voltage and said second transistor being connected to said first line voltage, said first and second transistors being connected to said safety ground; whereby said first transistor becomes conductive when said leakage current is generated from said first line voltage thereby inducing a reverse potential to said safety ground, and said second transistor becomes conductive when said leakage current is generated from said second line voltage thereby inducing a reverse potential to said safety ground.