Self-shielded DI/DT transformer for a meter

摘要

A sensor includes a core, first and second windings, an integrating amplifier circuit and a DC balancing circuit. The first and second windings are wrapped around the core. The integrating amplifier circuit has a first input coupled to the first winding, and an output operably coupled to the second winding. The DC balancing circuit is operably coupled between the output of the integrating amplifier circuit and the first input of the integrating amplifier circuit.

主权项

1. A sensor, comprising:
a) a core around which are wound first and second windings: b) an integrating amplifier circuit having a first input coupled to the first winding via a first circuit path, the first circuit path defining a first resistance from the first winding to the first input, and an output operably coupled to the second winding, the integrating amplifier circuit including a feedback circuit coupled from the output of the integrating amplifier circuit to the first input of the integrating amplifier circuit, the feedback circuit including a resistive path defining a second resistance from the output of the integrating amplifier circuit to the first input of the integrating amplifier circuit, and wherein the first resistance and second resistance are substantially equal.