Research And Design Of Electriccar Bi-Directional DC/DC Converter

Bi-directional DC/DC converter has a huge advantage in improving the overall performance of pure electric vehicles. Therefore, it has become an integral part in pure electric vehicle. Acceleration, deceleration, starting and braking is needed in car driving, so the motor voltage of pure electric vehicle was changed rapidly, the required direct-current voltage was provided by DC/DC converter.Traditional DC/DC converter only have a supporting capacitor in the load side, so capacitor voltage changes too much will be breakdown, aiming at the problem, On the basis of the existing topology structure, this paper design a kind of half power bidirectional DC DC converter for pure electric automobile. It can make up for this problem to a large extent.The author proposes a half-power bi-directional DC/DC converter which is simple structure and excellent performance characteristics after a review of a large number of domestic and foreign relevant references. On this basis, bidirectional DC/DC converter to determine the three-phase triple the basic topology according to high-power characteristics of the car.Based on the above proposed topological structure, through the analysis of different working conditions of their buck and boost modes, described in detail the half-power bi-directional DC/DC converter principle. Establish the effectiveness of using the state-space averaging state space model, combined with adaptive, inversion, sliding mode control algorithms such as the characteristics of the controller design, with the Matlab/simulink controller and model simulations to verify the controller design.Finally, the system hardware platform for hardware and software design, hardware design, including the main circuit design, sampling circuit design, circuit design and driver protection circuit design; Software design, including the main program design, sampling program design, algorithm design subroutine. The effectiveness of the proposed algorithm by designing experiments, analyzing experimental results verify.