Amplifier circuit for load control - has control signal energising each amplifier via potential separating stage

摘要

The amplifier controls a load with a high unipolar output a.c. voltage, dependent on a control signal, e.g. for energising a capacitive load within a given frequency range. The control signal (Ue) energises an amplifier (V1,2) each via a potential separating stage (P1,2), between whose output is incorporated the load (Z). The amplifier voltage supply is carried out for each amplifier by two of four series connected, identical voltages sources (U). Their junction points form the respective reference potential of the amplifier inputs. Pref. the amplifiers work with their potential separating stages with a mutual phase shift of 180 deg. The overall amplifying is variable by changing both amplifiers from inverting to non-inverting mode and vice versa. USE/ADVANTAGE - For determn. of static and dynamic characteristics of mechanical structures, with energising of capacitive load for piezoelectric members.