Filament Current Control for X-ray Tube Nonlinearity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The nonlinear characteristics of filament transformers in X-ray tubes lead to significant errors in controlling filament current, affecting the quality of X-ray radiation and diagnosis.
Innovation Solution
A method and device that acquire the current filament current value, determine its corresponding range, and calculate a control current using a specific formula based on end-point values to improve precision, involving a device with modules for acquisition, analysis, and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a filament transformer is used to control filament current, then the filament current can be adjusted, but the nonlinear characteristics of the transformer cause large errors in current control precision
Solution Approach 1:
The patent divides the continuous control of filament current into discrete segments by setting multiple predetermined filament current values. Instead of attempting precise continuous control through the nonlinear transformer, the system segments the current range and selects from predefined values, thereby avoiding the precision problems caused by transformer nonlinearity.
Solution Approach 2:
The patent changes the control parameter from continuous current adjustment to discrete current value selection. By transforming the control approach from continuous to discrete parameters, the system eliminates the impact of transformer nonlinearity on control precision while maintaining operational flexibility.
2Device complexity
If the converted secondary current is assumed to equal the actual filament current, then the control system is simple, but this assumption causes large errors due to transformer nonlinearity
Solution Approach 1:
The patent uses a simple lookup table approach instead of complex real-time measurement and compensation circuits. The correspondence between control current and actual filament current is pre-calculated and stored, replacing expensive and complex hardware solutions with a simple data structure that achieves high precision without adding system complexity.
3Measurement precision
If multiple discrete current values are used instead of continuous control, then measurement precision improves, but device complexity increases due to correspondence calculations
Solution Approach 1:
The patent performs the complex correspondence calculations in advance during system initialization or manufacturing, storing the results in a lookup table. This preliminary action eliminates the need for complex real-time calculations during operation, achieving high precision current control while keeping the operational system simple and fast.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces errors in filament current control, enhancing the precision and accuracy of X-ray tube operation by accounting for nonlinear transformer characteristics.
Implementation Method 1
when the primary current is converted to a secondary current
Implementation Method 2
the tube current is formed by the electrons excited by a heated filament under the action of a high voltage electric field
Data Source
AI summary
The present application discloses a method for controlling filament current and apparatus. The method comprises: acquiring a current filament current value (S11); determining a current range within which the current filament current value falls (S12); determining a correspondence between a filament current and a control current according to the current range (S13); and determining the current control current according to the current filament current value and the correspondence (S14). The problem of large errors in the control of filament current caused by nonlinear characteristics of a filament transformer can be solved.