Abstract: Compared with the traditional Power Transformer, the power electronic transformer has many advantages. it has a good application prospect. Firstly, this article shows the configurations and the main functions of the three-stage circuit in the single-phase Power Electronic Transformer. Then, this paper analyzes the working principle of the rectifier stage, the isolation stage and the inverter stage. At the same time, this paper selects the appropriate control strategy and designs the digital control system with the DSP. This paper designs and builds the main circuit, the detection circuit and the driving circuit, and builds the experimental platform of the single-phase Power Electronic Transformer, then it gives the experiment waveforms to show the validity of the design.

Key words: Power Electronic Transformer, three-stage circuit, digital control, TMS320F28335