Basic layout and components

• Electric motor is powered by a three-phase voltage inverter.
• Inverter is connected to the traction battery on its DC side (usually 400 V, now up to 800 V).
• Connection is secured by a switch (usually activated after turning the key).
• Standard on-board supply voltage is provided by a standard lead car battery.
• The 12 V battery is charged from the traction battery via a step-down DC / DC converter with galvanic isolation.
• The DC / DC converter is usually integrated in the traction converter chassis.
• The whole system is completed by an on-board charger for charging the traction battery from the AC supply.
• The speed of the electric motor to the axle is usually ensured by a single-stage gearbox (reducer).
  

Layout of electric car components - Bosch system