Seamless Switching Technology for Pure Electric Vehicles Based on DC Dual Powers

To the sudden voltage-loss problem of battery pack in pure electrical vehicles, this paper proposes a seamless switching algorithm used for dual DC power supply. The key of this algorithm is to place a spare battery on the pure electrical vehicles as additional energy for the battery pack. When detected the pack battery has a trend of loss of voltage, in no time, the control system start the boost circuit of the spare battery. At the same time, the control system makes the battery pack and the spare battery in parallel as the power supply for the motor driver system. Then the performance of the battery pack is tested further to put in use of the battery pack power supply or the spare battery power supply. This algorithm can achieve seamless switching, make sure the load voltage stability and the equipment operation safety and reliably. The simulation results demonstrate the validity and feasibility of the proposed algorithm