Method and system for controlling vehicle door position having reduced power supply current requirements

A vehicle door drive system comprising:

• a motor for opening or closing a vehicle door mechanically coupled to said motor;
• a three-phase inverter having an output coupled to said motor for supplying three-phase AC power to said motor;
• a capacitor coupled to an input of said three-phase inverter for storing energy;
• a reversible-current boost converter for boosting an input voltage supplied from a DC power source, said converter having an output coupled to said input of the inverter and said capacitor;
• a drive controller for controlling operations of the inverter and the converter in response to a door open/close command, and wherein said inverter returns power stored as kinetic energy of said vehicle door from the motor to the inverter input, and wherein said converter returns power from said input of said inverter to said DC power source;
• a locking device for mechanically securing said door in a terminal position;
• and
• a door terminal position detector for detecting when said door is secured in said terminal position and coupled to said drive controller, and wherein said drive controller further determines a position of said door and in response to determining that said door is in a terminal position, the operation of the reversible-current boost converter and said three-phase inverter is stopped.