Multi-blade grating control system based on field bus and high-speed differential serial communication

Abstract

The invention relates to a multi-leaf grating control system based on field bus and high-speed differential serial communication, which belongs to the technical field of field control and data acquisition of medical equipment. It includes a general computer, a fieldbus-based motion controller and multiple multi-axis motor control units; one end of the motion controller is connected to the general computer, and the other end is respectively connected to the multi-axis servo motors in each multiple multi-axis motor control unit through the field bus. The drives are connected synchronously; in each multi-axis motor control unit, both ends of each driving motor are respectively connected to the multi-axis servo driver and the multi-channel signal collector, and the multi-channel signal collector and the multi-axis servo driver are connected through a high-speed differential serial communication interface connect. In the case of a large number of driving motors and a large amount of data transmission, this system can reduce the number of transmission cables and improve manufacturability and reliability; the multi-channel signal collector can complete the position acquisition and processing of multi-axis motors within the current loop control cycle. transmission to meet the real-time requirements of servo control.

Description

technical field [0001] The invention belongs to the technical field of on-site control and data acquisition of medical equipment, in particular to a multi-leaf grating control system based on field bus and high-speed differential serial communication. Background technique [0002] In radiation therapy, the key core component to realize intensity-modulated radiation therapy is the multi-leaf collimator (Multi-leaf Collimator, MLC). The multi-leaf collimator uses the tungsten alloy leaf array as the actuator and is driven by the multi-axis motor array. Each leaf moves to the corresponding position according to the position command issued by the multi-leaf collimator control system, and quickly and accurately forms the field shape required by the clinic. Each motor drives a blade, and the actual MLC requires multiple motors (80 or 120 in conventional products), so realizing high-speed, real-time and precise control of the motor array is an important issue in the multi-leaf enco...

AI Technical Summary

Problems solved by technology

However, judging from the development trend of MLC, the DC motor will be replaced by the AC servo motor (the position feedback of the AC motor has four signal lines), and the number of blades will also be doubled. Therefore, if the current parallel transmission scheme is still adopted, the signal line The number of cables will reach nearly 1000, which will greatly affect the system reliability

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