| The magnetic levitation technology can realize the non-contact levitation of the permeable magnet,avoiding mechanical friction loss,and has high application value and development prospects.The power amplifier is the driving unit of the magnetic levitation system,which has an important influence on the levitation performance of the magnetic levitation system.The output current ripple of the traditional power amplifier is relatively large,and the excessive ripple will cause the floating of the object to become unstable.The PI parameters of traditional power amplifier controllers are often tried and tested by empirical methods.The process is relatively cumbersome,and the tried and tested parameters often fail to achieve the optimal response effect.When the power amplifier tracks the given signal,the traditional power amplifier has tracking delay and cannot follow the given signal quickly.In response to the above problems,this thesis designs a new type of power amplifier based on DSP digital chips.The power amplifier uses a three-level mode to replace the traditional twolevel mode to reduce the ripple of the output current.Analyze the working principles of the threelevel mode and the two-level mode first,derive the formulas for the current ripple values of the two modes,and then verify the current ripple through simulation and experiment respectively,which proves that the three-level mode can reduce the current ripple.The particle swarm algorithm is used to iteratively optimize the PI parameters of the controller,and then the inertia weight and learning factor of the algorithm are improved to adjust with the number of iterations.Through simulation verification,the improved particle swarm algorithm can effectively improve the optimization speed of particles.The power amplifier system uses the improved particle swarm algorithm to optimize the parameters.Through the step response experiment,it is proved that the parameters obtained by the optimization are better than the parameter response performance obtained by the traditional trial and error method.Aiming at the signal tracking delay problem,the reasons for the delay are analyzed,and the delay compensation scheme is determined.According to the formula derivation and design of the scheme,the delay compensation algorithm is designed,and the effectiveness of the algorithm is verified through simulation and experiment,so that the output current of the power amplifier system can track the given signal in real time.Finally,the power amplifier hardware system is designed,and the software program of the power amplifier is designed on this basis.The experimental debugging of the power amplifier was completed on the built software and hardware system,and it was verified that this power amplifier has the advantages of small current ripple,good input and output characteristics,fast current response,and no delay in signal tracking. |
PDF Full Text Request