Patent ID: 9103852
Filing Date: 2015-08-11
Classification: G01R,H01H,H02H

Abstract:
1. A circuit for sensing a direct current, the circuit comprising: a first resistance; a second resistance, wherein a first portion of the direct current flows through the first resistance and a second portion of the direct current flows through the second resistance; a current sensor having an opening and an output; a first conductor inductively coupled with the current sensor; a second conductor inductively coupled with the current sensor; and a switching circuit electrically connected to the second resistance and having a pair of switches structured to alternatingly switch in order that the second portion of the direct current alternatingly flows through the first conductor and the second conductor, wherein the second portion of the current flowing through the first conductor passes through the opening of the current sensor in a first direction and the second portion of the current flowing through the second conductor passes through the opening of the current sensor in a second direction opposite to the first direction, wherein the first resistance is electrically coupled between the second resistance and the first and second conductors.