In order to meet the requirements of real-time, scalability, flexibility, reliability and other requirements in the monitoring of inverter power multi-modules, a monitoring network is established using CAN fieldbus as the system communication transmission mode to monitor the inverter power module. On this basis, the design of the monitoring scheme on the operation station side is described, and the specific formulation of the CAN bus application layer protocol in the system communication and the design and implementation of the communication software are introduced in detail, the communication between the operation station and the controller is realized, and the monitoring function of the inverter power module is completed. Keywords: CAN bus; application layer protocol; monitoring The new high-frequency and small-power inverter power equipment uses the parallel connection between power modules to realize power synthesis and form a building block-type, intelligent distributed high-power power supply system, which is a new technology with great application prospects today. Combining several power modules can form a power supply system of any power level, which has a wide range of application prospects. The fully digital automatic control system based on fieldbus is a hot topic in the field of industrial automation in various countries around the world today. This paper uses CAN fieldbus to establish a monitoring network to monitor the power modules of embedded intelligent controllers containing DSP in single and multi-modules. CAN (Controler Area Network) bus belongs to the category of fieldbus and is a serial data communication bus. The CAN bus structure model adopts the 1st, 2nd and 7th layer protocols of the ISO/OSI reference model, namely the physical layer, data link layer and application layer. The content of the application layer mainly depends on the needs of the user, so when actually applying the CAN bus, the user can implement the functions of the application layer according to the needs.
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