Control device for activating and deactivating a y-capacitor, inverter and electric drive system

A controller (100) for activating and deactivating a Y-capacitor (Cy), wherein the Y-capacitor (Cy) is arranged between a power supply line and a node point (K), and a semiconductor switching element (M) for activating and deactivating the Y-capacitor (Cy) is arranged between the node point (K) and a ground, with:

• a transformer (T) having a primary side and a secondary side;
• a first control device (10) configured to provide predetermined control pulses to the primary side of the transformer (T), wherein the control pulses are configured to signal a desired switching state of the semiconductor switching element (M);
• a second control device (20) electrically coupled to the secondary side of the transformer (T) and configured to control the semiconductor switching element (M) using voltage signals present at the secondary side of the transformer (T);
• and
• a diode (D) located between a terminal of the secondary side of the transformer (T) and the node (K).