Modeling And Control For Pralleled Boost Convertor

As the basis of switching power supply research, DC/DC convertor modeling analysis is of great significance in analysing and designing switching power supply.As the distributed power and low-voltage high-current power supply are widely used, parallel switching power supply is paying more and more attention to.In this paper, the modeling and controlling of parallel Boost convertor is in-depth studied,which will contribute a lot to the improvement of the performance and efficiency of switching power supply.In this paper, considering the operating mode of the inductor current in continuous and discontinuous, the ideal parallel and non-ideal parallel Boost convertor of state-space model and the T-S fuzzy model are separately established by using state space modeling and T-S fuzzy modeling method .In the aspect of parallel Boost convertor controller desiging, the conventional PI control algorithm is first adopted,and then the simulation is carried out by using the critical sensitivity approach of tuning.Based on the non-ideal parallel Boost convertor of T-S fuzzy model, the controller for Boost convertor in CCM (continuous current mode) and DCM (discontinuous current mode) are designed. The simulation results demonstrate that the T-S fuzzy controller is better than PI controller.In-depth study of the parallel Boost convertor, a new group-style Boost convertor is proposed to reduce the output current ripple and difficulty of producing gate signals. Based on the principle of parallel Boost convertors, the working process of the proposed convertor topology is introduced in details. Then taking two groups of dual parallel Boost convertors for example, the design of producing staggered drive signals and the way of current sharing are described. The self-sdjusting weighted average current sharing controller used in this system is an effective solution to the problem that the traditional average current controller can't work accurate when module failure in parallel DC/DC system. Simulation results demonstrate that the DC/DC convertors with group-style staggered parallel technique are advanced and feasible.Finally, based on dSPACE, PI control system and T-S fuzzy system was designed. The experimental results proved the validity and advanced of T-S fuzzy system.