A manchester code communication protocol suitable for power electronics system

To satisfy the requirements of complex distributed power electronic system (PES) communication, this paper has proposed a single optic-fiber link data communication protocol based on the Manchester code due to an vacancy in the commonly-adopted protocols, analyzed the encoding and decoding principle of Manchester code, defined the formats of command frame and data frame, calculated the communication time and error rate, and described the mechanism of fault identification and handing. All this leads to a distributed master-slave control structure suitable for high-power multiphase inverter and a point-to-point data communication mode. Experiments prove the protocol to be correct and feasible. The Manchester code communication protocol based on FPGA program is simple in the structure of hardware and software. When the system clock is 100MHz, the communication bandwidth can reach 40Mbps, which can meet the needs for communication of PES with kHz or 10kHz switching frequency.