Electronic integrator for Rogowski coil sensors

摘要

An integrator circuit for a current sensor such as a Rogowski coil. The integrator circuit includes an integrator having an input for receiving a signal from a current sensor and having an output providing a voltage signal. A high-pass filter has an input coupled to the output of the integrator and substantially removes the DC content from the voltage signal. A feedback loop has an input coupled to the output of the integrator and to the high-pass filter, and has an output providing the DC content of the voltage signal back to the input of the integrator. The integrator circuit can detect large current steps in the line conductor being monitored and can be used for line fault detection.

主权项

1. An integrator circuit for a current sensor, comprising:
an integrator having an input for receiving a signal from a current sensor and having an output providing a voltage signal; a high-pass filter having an input coupled to the output of the integrator and having an output, wherein the high-pass filter substantially removes a DC content from the voltage signal; a voltage follower having an input coupled to the output of the high-pass filter and having an output; and a difference amplifier having a first input coupled to the output of the integrator, a second input coupled to the output of the voltage follower, and an output providing the DC content of the voltage signal to the input of the integrator, wherein the output of the voltage follower provides a signal related to the signal from the current sensor, wherein the voltage follower provides a ringing signal in response to a current step detected by the current sensor.