The Research Of Medium Frequency Parallel Operation Inverter Module

In recent years, the type of AC power supply is changing from the concentrated one to the distributed and overall-functional one, and the key point of this research is the built-up technology of module of power supply. Parallel operation configuration of several modules has the advantages of enlarging the load of the power supply flexibly, enhancing the ability of redundancy, and in that way, it can be maintained and changed easily. This paper is focus on the idiographic request of the medium frequency power supply of the fire control system of the aerial defense antiaircraft artillery, exploring the question of the module of parallel operation medium frequency inverter with the digital control, which could adjust the frequency, amplitude and phase accurately.By analyzing the characteristics of the parallel operation inverter, we point out that circumfluence is the core issue, and it is the guarantee to keep the frequency, amplitude and phase of the output voltage of each module identical. After analyzing several control projects of parallel operation inverter, we chose the master-slave control project, which makes the current average realized by the slave module following the output voltage of the master one. The thought is clear, and it is easy to realize with high reliability.The inverter module is the foundation for parallel operation, and whether the capability of module is good or not will influence the effect directly. This paper explored the design of parallel operation medium frequency inverter module with DSP controlled, according to the request of adjusting the frequency, amplitude and phase easily. We design the inverter module main circuit with Intelligent Power Module. And we adopt voltage-current double close-loop control method, this could make the system has high capability of quick response. The control method is realized by DSP, so it is more flexible and credible than former controller. We choose suitable optoisolator to realize the isolation and transfer of data from main circuit to control side. And the flyback topology with TOPSwitchâ…¡is used to design the drive power supply for IPM according to the need of system.On the basis of the upper research, the author designs a module laboratorial...