Circuit arrangement for impressing an electrical signal into an electrochemical energy supply device

A circuit arrangement for impressing an electrical alternating signal into an electrochemical energy supply device by means of a control device, comprising

• the control device for outputting an output signal corresponding to the electrical alternating signal to be impressed, for impression into the electrochemical energy supply device, wherein the output signal is determined based on at least one setpoint, which is set by the control device, of the electrical alternating signal to be impressed, and
• at least one coupling capacitor, being downstream of the control device, and being connected in series to the electrochemical energy supply device at least during a duration of the impressing of the electrical alternating signal,
• wherein the control device is configured as a controlled power amplifier, to which an actual signal is returned during a duration of the impressing of the electrical alternating signal, which corresponds to the output signal and which is applied at the electrochemical energy supply device, wherein the controlled power amplifier is set up to compare the actual signal applied at the electrochemical energy supply device with the at least one setpoint of the electrical alternating signal to be impressed and to control the output signal to minimize a deviation between the actual signal and the at least one setpoint of the electrical alternating signal to be impressed;
• wherein the controlled power amplifier has a signal output for supplying the electrical alternating signal into the electrochemical energy supply device, wherein the circuit arrangement further comprises a switching device for switchably connecting the signal output of the controlled power amplifier to the electrochemical energy supply device, wherein the switching device is configured to compare an actual voltage of the coupling capacitor with an actual voltage of the electrochemical energy supply device for detecting a voltage difference, and
• i) to switch to an interrupted state when a predefinable first value is exceeded, in which the impression of the electrical alternating signal to be impressed is interrupted and the at least one coupling capacitor is connected in parallel to the electrochemical energy supply device to reduce the voltage difference, and
• ii) at a point i) subsequent falling below a predefinable second value, to switch in a signal impression state, in which the at least one coupling capacitor is connected in series with the electrochemical energy supply device in order to continue the impression of the electrical alternating signal.