Method for Processing a Measured-Value Signal Representing a Value Determined in Analog Form for the Output Current of a Converter and Device for Carrying Out the Method

A device for processing a measured-value signal representing a value, determined in analog form, for an output current of a converter, comprising:

• a sensor;
• at least one delta-sigma modulator;
• and
• first and second digital filters;
• wherein:
• the sensor (a) acquires the measured-value signal and (b) supplies the measured-value signal to the at least one delta-sigma modulator;
• the at least one delta-sigma modulator supplies a bit stream to the first digital filter;
• the first digital filter (a) converts the bit stream into a stream of digital intermediate words and (b) supplies an output signal to the second digital filter, wherein the first digital filter includes a number of serially disposed accumulators, the bit stream and the stream of digital intermediate words being clocked with a clock frequency fS and a clock period TS−1/fS;
• the second digital filter determines a difference between a first and a second result data-word stream such that the difference is output as output data-word stream;
• the first and second result data-word streams are determined from the intermediate data-word stream over a first and a second time interval, the first and second time intervals having time duration T1;
• the first result data-word stream is determined from the intermediate data-word stream as a time-discrete differential of the order (n−1), with time duration TD;
• the second result data-word stream is determined from the intermediate data-word stream as a time-discrete differential of the order (n−1), with time duration TD;
• and
• T1 is equal to or greater than the double of TD.