Driver circuit and thus formed converter electronics or thus formed measuring system

摘要

The driver circuit includes a signal generator having a frequency control input, an amplitude control input and a signal output, an output stage having a signal input and a load output and an amplitude controller having an amplitude input, an amplitude output and a voltage measuring input. The signal generator is set up to output at its signal output an at least temporarily periodic electrical analog signal having a signal frequency predetermined by a frequency control value applied to the frequency control input and a voltage and / or current amplitude predetermined by an amplitude control value applied to the amplitude control input. The output stage is set up to drive a load current having a current dependent on a signal voltage and / or a signal current of an electrical input signal applied to the signal input through a load circuit comprising a load output and to provide a load voltage at the same load output with a voltage level dependent on the current magnitude of the load current , Moreover, the amplitude control is set up to periodically determine an amplitude deviation between an amplitude actual value present at the amplitude input and an amplitude desired value. In addition, the amplitude control is adapted to periodically determine an indicator value which indicates whether an amount of a voltage applied to the voltage measuring input is too high, namely whether the amount has exceeded a threshold, and to determine an amplitude control value using the indicator value such that if the amplitude control sequence is too high, the amplitude control values of the amplitude control sequence are reduced, and an amplitude control sequence of amplitude control values calculated one after the other is output at the amplitude output. The signal output of the signal generator, in turn, is electrically connected to the signal input of the output stage and its load output is electrically connected to the voltage measuring input of the amplitude control. In addition, the amplitude output of the amplitude control is electrically connected to the amplitude control input of the signal generator.