Patent ID: 8916998

Claim:
A circuit arrangement comprising a drive device control circuit for controlling an electrical drive device, said drive device control circuit comprising: a first terminal and a second terminal adapted to be connected externally to a voltage source, a motor converter arranged internally within the drive device control circuit, and adapted to control an electric drive motor, a converter control arranged internally within the drive device control circuit, and connected and adapted to control the motor converter, a π-filter including: an input capacitor connected to the first and second terminals internally within the drive device control circuit, a back-up capacitor connected in parallel to the motor converter, and a coil connected to the first terminal and connected in series with the back-up capacitor internally within the drive device control circuit, a first return conductor that connects the back-up capacitor and the motor converter to each other to form a back-up circuit, and that connects the motor converter and the converter control to each other to form a converter control circuit, and a second return conductor that is connected to the second terminal internally within the drive device control circuit, wherein the first and second return conductors are connected to each other only at exactly one single connection point internally within the drive device control circuit, wherein the second return conductor extends from the second terminal to the one single connection point internally within the drive device control circuit, and wherein the one single connection point has a smaller spatial extension than the first and second return conductors themselves.