Circuit arrangement for actuating a large-area capacitive load that is to be operated with an ac voltage and method for operating such a circuit arrangement

A circuit arrangement for actuating a large-area capacitive load for operating with an AC voltage, the capacitive load comprising a first connection and a second connection, the capacitive load behavior being dependent on an RMS value of applied voltage,

• further comprising a first actuation circuit and a second actuation circuit that are designed to generate a first signal and a second signal, respectively, which are optimized in terms of harmonics,
• wherein an output connection of the first actuation circuit is connected to the first connection of the capacitive load and an output connection of the second actuation circuit is connected to the second connection of the capacitive load,
• and further comprising a control circuit configured to actuate the first actuation circuit and the second actuation circuit so that the generated signals that are optimized in terms of harmonics are offset from one another in time, resulting in AC voltage being applied to the capacitive load, wherein:
• the first actuation circuit and the second actuation circuit each comprise a first actuatable square-wave signal generator and a second actuatable square-wave signal generator, respectively,
• a first filter circuit and a second filter circuit is connected downstream of the first square-wave signal generator and the second square-wave signal generator, respectively, whereby a gradient of switching edges of a square-wave signal is set,
• a first voltage follower and a second voltage follower connected downstream of the first filter circuit and the second filter circuit, respectively, the respective output connection of said voltage followers respectively forming an output connection of the first actuation circuit and the second actuation circuit, and said voltage followers respectively comprising a supply connection, wherein the supply connections are connected to a supply voltage via at least one EMC filter,
• wherein the control circuit is configured to actuate the first square-wave signal generator and the second square-wave signal generator so that the generated square-wave signals are offset from one another in time.