Active Integrator for Rogowski Coil Reference Design with Improved Accuracy for Relay and Breaker
TIDA-00777
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Key Document
- Active Integrator Rogowski Coil for Relay and Breaker Design Guide (Rev. A)
(PDF 1614 KB)
29 Sep 2016
Description
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.
Features
- 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.
See the Important Notice and Disclaimer covering reference designs and other TI resources.