Abstract
A current-to-voltage converter (CVC) is presented, which has three input ranges for nominal input currents of 0.2, 1, and 5 A with frequencies from 30 Hz to 30 kHz. The converter uses an amplifier-aided two-stage current transformer which operates with a very small number of ampere-turns and the primary (measurement) current path of which may be potentially elevated without its error characteristics being affected. The secondary current of 5 mA of the transformer is converted into voltage using an inverting amplifier with a feedback resistor of 1 k/spl Omega/. By fine adjustment of its frequency-dependent feedback, small errors and a small error variation are achieved over the whole frequency range. The variation of errors between 20 and 100% of nominal current in each current range is negligibly small. In the frequency range from 30 Hz to 1 kHz, relative errors of less than 10/sup -4//spl plusmn/2/spl times/10/sup -5/ are achieved. From 1 to 30 kHz, the errors increase up to 2/spl times/10/sup -4/ with /spl plusmn/5/spl times/10/sup -5/ uncertainty for the in-phase and /spl plusmn/40/spl times/10-5 for the quadrature component. The current-to-voltage converter was calibrated by means of a high-quality current shunt, which was especially developed for this purpose.
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