CN-115665955-B - KV voltage control method for X-ray high-voltage generator

CN115665955BCN 115665955 BCN115665955 BCN 115665955BCN-115665955-B

Abstract

The application relates to a KV voltage control method for an X-ray high-voltage generator, in particular to the technical field of KV voltage control. The method comprises the steps of obtaining a KV sampling feedback signal, carrying out notch processing on the KV sampling feedback signal aiming at a target interference frequency to obtain a KV filtering signal, and controlling a driving circuit based on a first error between the KV filtering signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal so as to output KV voltage of an X-ray high-voltage generator. Based on the scheme, the method firstly acquires the KV sampling feedback signal, and then performs notch processing on the KV sampling feedback signal aiming at the target interference frequency to acquire the KV filtering signal. The notch processing carries out signal filtering processing on noise in a specific frequency band in the KV sampling feedback circuit, so that interference of noise such as power frequency is effectively reduced, accuracy of KV sampling feedback signals is improved, and high-accuracy KV voltage is obtained.

Inventors

HU QINGYI
FAN SHENGFANG
WANG YAN
HE JIE
CHEN FEI

Assignees

苏州博思得电气有限公司

Dates

Publication Date: 20260508
Application Date: 20221009

Claims (8)

1. A method of KV voltage control of an X-ray high voltage generator, the method being performed by a target processor, the method comprising: Acquiring a KV sampling feedback signal, wherein the KV sampling feedback signal is obtained by sampling KV voltage by an analog circuit; Performing notch processing on the KV sampling feedback signal aiming at the target interference frequency to obtain a KV filtering signal; Controlling a driving circuit based on a first error between the KV filtering signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal to output the KV voltage of an X-ray high-voltage generator; The controlling the driving circuit based on a first error between the KV filtered signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal to output the KV voltage of the X-ray high-voltage generator includes: generating a driving frequency based on a first error between the KV filtering signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal, wherein the first error and the second error are subjected to weighting processing to obtain a weighted error, and the driving frequency is generated based on the weighted error; And controlling the driving circuit based on the driving frequency to output the KV voltage of the X-ray high-voltage generator.
2. The method of claim 1, wherein the notch processing the KV sampled feedback signal for a target interference frequency to obtain a KV filtered signal comprises: performing analog-to-digital conversion on the KV sampling feedback signal to obtain a KV sampling digital signal; And aiming at a target interference frequency, carrying out notch processing on the KV sampling digital signal by the target processor to obtain the KV filtering signal.
3. The method of claim 2, wherein the notch processing, by the target processor, the KV sampled digital signal for a target interference frequency to obtain the KV filtered signal, comprises: Calling a digital trap of a target interference frequency to process the KV sampling digital signal through the target processor to obtain the KV filtering signal; wherein the transfer function of the continuous timing of the digital trap is G(s) = (s 2 +ω n 2 )/(s 2 +2ξω n +ω n 2 ), where ω n is the notch center point frequency and ζ is the notch width.
4. A method according to any one of claims 1 to 3, wherein said generating said driving frequency based on said weighted error comprises: And processing the weighted errors through a PID digital control frequency modulation algorithm to obtain the driving frequency.
5. The method of claim 4, wherein the transfer function of the PID digital control frequency modulation algorithm is G 1 (s)=K p +K i *S+K d /S, wherein K p 、K i and K d are predetermined parameters, respectively.
6. An X-ray high voltage generator KV voltage control apparatus, characterized in that the apparatus comprises: the system comprises a sampling feedback signal acquisition module, a sampling feedback signal acquisition module and a sampling feedback signal generation module, wherein the sampling feedback signal acquisition module is used for acquiring a KV sampling feedback signal, and the KV sampling feedback signal is obtained by sampling KV voltage through an analog circuit; the notch module is used for carrying out notch processing on the KV sampling feedback signal aiming at the target interference frequency to obtain a KV filtering signal; The drive control module is used for controlling a drive circuit based on a first error between the KV filtering signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal so as to output the KV voltage of the X-ray high-voltage generator; The drive control module is further configured to: generating a driving frequency based on a first error between the KV filtering signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal, wherein the first error and the second error are subjected to weighting processing to obtain a weighted error, and the driving frequency is generated based on the weighted error; And controlling the driving circuit based on the driving frequency to output the KV voltage of the X-ray high-voltage generator.
7. A computer device comprising a processor and a memory, the memory having stored therein at least one instruction that is loaded and executed by the processor to implement the X-ray high voltage generator KV voltage control method of any of claims 1 to 5.
8. A computer readable storage medium having stored therein at least one instruction that is loaded and executed by a processor to implement the X-ray high voltage generator KV voltage control method according to any of claims 1 to 5.

Description

KV voltage control method for X-ray high-voltage generator Technical Field The application relates to the field of KV voltage control, in particular to a KV voltage control method of an X-ray high-voltage generator. Background X-ray detection has important application in the fields of hospital patient diagnosis, industrial nondestructive detection, station security inspection and the like. The high-voltage generator is used as a core component for X-ray detection, and the requirements on performance parameters of the high-voltage generator are very strict in practical application. With the successive application of circuits such as a multi-voltage circuit, a full-wave rectifying circuit and the like, a power supply device for supplying the power frequency alternating current with cathode and anode direct current high voltage of an X-ray tube through multi-voltage rectification after boosting appears. Due to the adoption of the high-voltage transformer and the voltage doubling circuit, the ray tube obtains higher tube voltage, and the penetration force is greatly improved. The input side of the high-voltage generator is the AC input voltage of the network power supply, and the AC voltage is converted into the DC bus voltage after passing through the rectifying unit. The input end of the closed-loop control inversion unit is the voltage of a direct current bus. In an actual power supply device, fluctuation of power frequency (50 Hz) and the like can be coupled into a KV feedback signal through a ground wire, so that noise disturbance occurs in a KV sampling loop, closed-loop adjustment of KV is affected, and KV voltage output precision is further affected. Disclosure of Invention The application provides a method for controlling the KV voltage of an X-ray high-voltage generator, which reduces noise disturbance of a KV sampling loop and improves KV voltage output precision. In one aspect, there is provided a method of controlling KV voltage of an X-ray high voltage generator, the method being performed by a target processor, the method comprising: Acquiring a KV sampling feedback signal, wherein the KV sampling feedback signal is obtained by sampling KV voltage by an analog circuit; Performing notch processing on the KV sampling feedback signal aiming at the target interference frequency to obtain a KV filtering signal; And controlling a driving circuit based on a first error between the KV filtering signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal so as to output the KV voltage of an X-ray high-voltage generator. In yet another aspect, there is provided an X-ray high voltage generator KV voltage control apparatus, the apparatus comprising: the system comprises a sampling feedback signal acquisition module, a sampling feedback signal acquisition module and a sampling feedback signal generation module, wherein the sampling feedback signal acquisition module is used for acquiring a KV sampling feedback signal, and the KV sampling feedback signal is obtained by sampling KV voltage through an analog circuit; the notch module is used for carrying out notch processing on the KV sampling feedback signal aiming at the target interference frequency to obtain a KV filtering signal; The drive control module is used for controlling a drive circuit based on a first error between the KV filtering signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal so as to output the KV voltage of the X-ray high-voltage generator. In one possible implementation manner, the notch processing is performed on the KV sampling feedback signal for the target interference frequency to obtain a KV filtered signal, including: performing analog-to-digital conversion on the KV sampling feedback signal to obtain a KV sampling digital signal; And aiming at a target interference frequency, carrying out notch processing on the KV sampling digital signal by the target processor to obtain the KV filtering signal. In one possible implementation manner, the performing, by the target processor, notch processing on the KV sampled digital signal for a target interference frequency to obtain the KV filtered signal includes: Calling a digital trap of a target interference frequency to process the KV sampling digital signal through the target processor to obtain the KV filtering signal; Wherein the transfer function of the continuous timing of the data trap is G(s) = (s 2+ωn2)/(s2+2ξωn+ωn2), where ω n is the notch center point frequency and ζ is the notch width. In one possible implementation, the controlling the driving circuit to output the KV voltage of the X-ray high voltage generator based on a first error between the KV filtered signal and a target KV signal and a second error between the target KV signal and the KV sampling feedback signal includes: generating a driving frequency based on a first error between the KV filtered signal a