Power conversion control system for plural electric motors and auxiliary circuit

An electric vehicle control system for controlling a plurality of main motors for driving an electric vehicle and an auxiliary circuit of said electric vehicle, said control system comprising:

• a first circuit breaker;
• a first main power converter with an input side connected to said first circuit breaker and an output side connected to a first main motor out of a plurality of said main motors, for receiving a DC power through said first circuit breaker for converting said DC power into a first AC power to supply said first AC power to said first main motor;
• a second circuit breaker;
• an auxiliary power converter with an input side connected to said second circuit breaker and an output side connected to said auxiliary circuit, for receiving said DC power through said second circuit breaker for converting said DC power into a second AC power to supply said second AC power to said auxiliary circuit;
• a second main power converter with an input side connected to one of said first circuit breaker and said second circuit breaker and an output side connected to one of a second main motor out of a plurality of said main motors and said auxiliary circuit, for receiving said DC power through one of said first and second circuit breakers for converting said DC power into a third AC power to supply said third AC power to one of said second main motor and said auxiliary circuit respectively;
• detection means for detecting whether said auxiliary power converter is operating normally or malfunctioning;
• and
• switch means for controlling connections to said input side and said output side of said second main power converter such that when said auxiliary power converter is detected by said detection means as operating normally, said input side is connected to receive DC power solely via said first circuit breaker and said output side is connected to supply said third AC power solely to said second main motor, and when said auxiliary power converter is detected by said detection means as malfunctioning, said input side is connected to receive DC power solely via said second circuit breaker and said output side is connected to supply said third AC power solely to said auxiliary circuit.