The Design Of Digital Controller In Servo Systems Based On SOPC

With the advantages such as high control precision, fast response speed and large output power, electro-hydraulic servo system is widely used in weapon systems. Nowadays, because of the increasing requirements of control precision and dynamic characters of missile system the traditional analog servo controller cannot meet the needs, while the digital controller offers an effective resolvent. In addition, as the digital missile develops fast the MIL-STD-1553B bus becomes more and more popular in missile system, so designing the digital controller with communication function for servo systems has great meanings.After studying the requirements of the digital servo controller and the protocols of MIL-STD-1553B, this paper brought forward a design based on the technology of System On Programmable Chip(SOPC in the following). This paper designed a structure of two embedded processors based on FPGA chip, which implements servo control and communication functions separately. This structure improved the performance and integration level, reduced the cost. The control software developed on servo control core provided an open structure, on which the intelligent arithmetic can be embedded and the parameters can be tuned for particular applications. The communication core with a set of logic implemented the functions of coding, decoding, data buffering, message testing and command judging and performing. In addition, the paper also designed the driving circuit for communication, the signal tuning and A/D convertion circuit for signal collection, and D/A convertion and the V/I transform circuit for output.The testing result demonstrates that the software and hardware of the controller are designed in reason, and satisfy the design requirements.