High-voltage generator digital control method and system based on multiple sets of pid parameters

Abstract

The invention provides a digitalized control method and system for high voltage generator based on groups of PID parameters, and the method and system are suitable for the technical field of numerical control. A preprocessing step is carried out before the method, namely before exposure of the high voltage generator; in the preprocessing step, different PID parameters are set for different power segments, and the problem that the same group of PID is not suitable for output of all power segments of the high voltage generator is solved effectively; exposure of the high voltage generator comprises a soft start step and a PID adjustment step; in the soft start step, only an integration link is reserved, it is ensured that output of a PWM duty ratio increases from zero, the PWM duty ratio is prevented from abrupt change, and IGBT overvoltage and over-current are prevented effectively; and in the PID adjustment step, an incremental PID algorithm is used, an optimal PID parameter is obtained from the PID parameter group, PID adjustment is carried out, it is ensured that voltage output by the high voltage generator is stable, convergence time is reduced, and overcharging is prevented.

Description

technical field [0001] The invention belongs to the technical field of numerical control, and in particular relates to a digital control method and system for a high-voltage generator based on multiple sets of PID parameters. Background technique [0002] In the X-ray high-voltage generator control system, the bulb voltage (both expressed in kV below) and the bulb current (both expressed in mA below) are the two most important variable values ​​that the system needs to generate. The rise time, output ripple, and output accuracy of kV and mA must meet the national standards. Since the shortest exposure time of the high-voltage generator is at the mS level, the rise time of kV is required to be fast without overshooting, which has always been a technical difficulty that plagues the industry. [0003] In an implementation manner of the high-voltage generator control system, an analog PID (proportion integral derivative, proportional-integral-derivative) control system is used....

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a high-voltage generator digital control method and system based on multiple sets of PID parameters, aiming to solve the problem of difficulty in controlling the bulb voltage of the high-voltage generator

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