Active Integrator for Rogowski Coil Reference Design with Improved Accuracy for Relay and Breaker

1 января 2018

The TIDA-00777 TI Design shows an active integrator design that covers wide input current range for Rogowski Coil with excellent accuracy, linearity, stability and repeatability. The integrator uses a precision amplifier with very low offset and temperature drift. Two configurations of the integrator are shown; one for precision measurement with less than 3O phase error and the other for fast response time (<15ms RC). While the output signal is bipolar, optional level shifting stage can be used when unipolar output is required.

Особенности

Active integrator design using low offset and close to zero drift amplifier (OPA2188) Integrator output compatible with unipolar or bipolar ADC input range (Ex: ADS131A04 with 0-5V or ±2.5V input) Integrator has been tested for accuracy at 50/60Hz, repeatability and temperature stability over 25°C ± 35°C The integrator operates from a single 5V DC input with positive and negative voltages for bipolar operation generated on board.