Voltage control apparatus, ray tube apparatus and voltage control method

Abstract

The invention provides a voltage control apparatus and a voltage control method, and a ray tube apparatus. The voltage control apparatus comprises an inverter circuit, a high voltage generator, a first voltage regulation apparatus and a second voltage regulation apparatus, wherein the inverter circuit converts an input direct current into a primary alternating current; the high voltage generator converts the low voltage primary alternating current into high voltage secondary alternating current, and applies the output end voltage to a load at the output end; the secondary alternating current comprises the output end current flowing to the load and the charging current flowing to a capacitor element; the load is connected with the capacitor element in parallel; the first voltage regulation apparatus calculates the deviation between the output end voltage of the high voltage generator and a predetermined first reference voltage, and takes the deviation as the first voltage deviation; the second voltage regulation apparatus obtains a charging voltage value corresponding to the value of the charging current flowing to the capacitor element, calculates the deviation between the charging voltage value and a predetermined second reference voltage, and takes the deviation as the second voltage deviation; and the first voltage deviation and the second voltage deviation are used as control parameters to be fed back to the inverter circuit.

Description

technical field [0001] The invention relates to a voltage control device, a ray tube device and a voltage control method. Background technique [0002] Typically, X-rays are produced by high-speed moving electrons striking the anode target. The high voltage used to accelerate electrons is called the tube voltage (which can be expressed in KV). The tube voltage is not only directly related to the generated X-ray dose, but also its ripple will affect the radiation quality of X-rays. The ideal tube voltage is a stable DC voltage, so that every electron can hit the anode target surface at the same speed, so as to generate high-quality, stable radiation X-rays, and then obtain high-quality images. [0003] At present, X-ray high-voltage generators have adopted high-frequency inverter technology to obtain tube voltage. A common method is to compare the set tube voltage value with the actual sampled tube voltage value and then control the inverter system to obtain the tube volta...

AI Technical Summary

Problems solved by technology

However, because the actual sampled tube voltage value is the high voltage after rectification and filtering, there is a hysteresis phase shift between the current output by the inverter circuit (ie, the primary current of the high-voltage transformer), that is to say, the actual output value (the output tube voltage Voltage value) and the control quantity (inverter output) are not synchronized, so this closed-loop control method sometimes cannot respond quickly to small changes in the actual output voltage, and the ripple output of the tube voltage is sometimes difficult to control within the ideal range within

Images