System for controlling tube current in mixed way and control method thereof

Abstract

The invention relates to a system for controlling tube current in a mixed way. The system comprises a tube current control system and a lamp filament current control system connected with the tube current control system, wherein the lamp filament current control system is connected with a lamp filament through a lamp filament current driving system. A method comprises the following steps that the tube current control system controls the tube current according to the tube current fed back by an X-ray ball tube; the lamp filament current set value is output to the lamp filament current control system; the lamp filament current control system controls the lamp filament current according to the lamp filament current set value and the lamp filament current value fed back by the lamp filament current driving system; a lamp filament current driving signal is output; the lamp filament current is controlled through controlling the lamp filament current driving system. The tube current can be precisely controlled; the accuracy and the stability can be improved; the device aging problem in the simulation technology is solved, so that the design is more flexible; the size is reduced; the cost is reduced; the system consistency is improved.

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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