Aiming at the problems of AC side decoupling circuit control in photovoltaic grid-connected power generation system, DSP digital control and 74 series chip analog control were used in the system control at the same time in this study. On the basis of lower hardware cost, the control of micro inverter decoupling circuit can be better realized. It summarized the advantages and disadvantages of the DSP, FPGA and DSP + FPGA con- troller. The power coupling circuit simulation control circuit was designed by taking 74L chip as the core and referring to the double CPU design on the basis of the relevant innovation improvement and the experimental platform was established. The results show that the design is feasible, providing a new perspective for the cou- pling circuit of micro inverter control.