Various approaches are described for managing refractory periods based on the detection of an evoked response. A cylinder mechanism, which has a piston that is displaceable in the axial direction by being supplied with the pressure oil, is provided on the pump-driving section and the pump mechanism. In this way a silicon oxide and a silicon nitride may be applied for the insulating layers and thus the method according to the invention is very compatible with current IC processes. Further, the secondary batteries are heated by thermal energy generated by the transfer of the stored electric charge. A method for operation of a compressor supplied by a power converter is then achieved with which the duration and the intensity of surge conditions is significantly reduced. The apparatus rewrites the function limiting flag by this limitation removing key.