Electrical filter circuit for an electric drive

An electrical filter circuit (100) for an electric drive (200), wherein the filter circuit comprises an input-side three-pole filter input connection (213, 215, 217) and an output-side three-pole filter output connection (212, 214, 216),

• wherein the input-side three-pole filter input connection is configured to be connected to a positive pole of a high voltage battery (230) at a first filter input terminal (213), to be connected to a negative pole of a high voltage battery (230) and a negative pole of a charging voltage (232) at a second filter input terminal (215) and to be connected to a positive pole of a charging voltage (234) at a third filter input terminal (217), and
• wherein the output-side three-pole filter output connector is adapted to be connected to a positive input connection of an inverter (210) at a first filter output terminal (212), connected to a negative input connection of an inverter (210) at a second filter output terminal (214) and connected to a winding terminal (228) of an electric machine (220) connected to the inverter (210) at a third filter output terminal (216), or
• wherein the input-side three-pole filter input connection is configured to be connected to a negative pole of a high voltage battery (230) at a first filter input terminal (213), to be connected to a positive pole of the high voltage battery (230) and a positive pole of a charging voltage (232) at a second filter input terminal (215) and to be connected to a negative pole of a charging voltage (234) at a third filter input terminal (217), and
• wherein the output-side three-pole filter output connection is configured to be connected to a negative input connection of the inverter (210) at a first filter output terminal (212), connected to a positive input connection of the inverter (210) at a second filter output terminal (214) and connected to the winding terminal (228) of an electrical machine (220) connected to the inverter (210) at a third filter output terminal (216)
• wherein
• the filter circuit (100) comprises an x-capacitor (CX_i), a first and a second y-capacitor (CY1_i, CY2_i),
• wherein the x-capacitor (CX_i) is connected between the first and third filter output terminals (212, 216) or the first and third filter input terminals (213, 217), and the first y-capacitor (CYl_i) is connected between the third filter output terminal (216) or the third filter input terminal (217) and a reference potential or ground
• and the second y-capacitor (CY2_i) is connected between the second filter output terminal (214) or the second filter input terminal (215) and a reference potential or ground.