A system for hybrid control tube current and its control method

Abstract

The invention relates to a hybrid control system for tube current, comprising a tube current control system and a filament current control system connected thereto; the filament current control system is connected with the filament through a filament current drive system. The method includes: the tube current control system controls the tube current according to the tube current fed back by the X-ray tube, and outputs the filament current setting value to the filament current control system; the filament current control system drives the system according to the filament current setting value and the filament current feedback The filament current value is used to control the filament current, output the filament current drive signal, and control the filament current by controlling the filament current drive system. The invention can precisely control the tube current, improve its accuracy and stability, solve the device aging problem existing in the simulation technology, make the design more flexible, reduce the volume, reduce the cost, and improve the system consistency.

Description

technical field [0001] The invention relates to the technical field of high-voltage generators, in particular to an X-ray tube current control system and a control method thereof. Background technique [0002] The X-ray tube is a vacuum tube with two poles, the filament is the cathode, usually a tungsten wire, and the anode is a target made of metal. A high DC voltage (tube voltage) is applied between the cathode and anode. When the cathode is heated to an incandescent state, a large number of electrons will be released. These electrons are accelerated in the high-voltage electric field and fly from the cathode to the anode (tube current). Finally, it hits the metal target at a very high speed and loses its kinetic energy. Most of this kinetic energy is converted into heat energy, and only a very small part is converted into X-rays. The number of electrons emitted by the filament can be changed by adjusting the current of the filament, and the relationship between the filam...

AI Technical Summary

Problems solved by technology

[0003] In existing X-ray machines, some devices only use the filament current as feedback to form a closed loop, and do not directly form a closed loop with the tube current, which is difficult to meet the cutting-edge requirements. When the filament is in a cold state and a hot state, the difference in resistance causes the tube current to be unstable and affects the image. quality

There are also some equipment closed-loop systems implemented by analog circuits, generally using operational amplifier circuits, which have disadvantages such as poor scalability and changeability, inflexible control methods, large influence of device differences on the circuit, and large circuit area.

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