Bipolar High-Voltage X-Ray Tube Driving Circuit
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Solution Overview
Problem
Conventional high-voltage X-ray tube driving methods are expensive and inefficient for removing residual gases and impurities, particularly due to the high cost and complexity of high-voltage switches, and are inadequate for voltages exceeding thousands of volts.
Innovation Solution
A driving device utilizing bipolar regulated high-voltage pulses applied to the anode and cathode of the high-voltage X-ray tube, comprising a microprocessor unit and high-frequency voltage boost circuits to generate specific timing sequences of control signals for positive and negative voltage pulses, reducing the need for expensive high-voltage switches and enhancing impurity removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-voltage switch is used to connect the anode and high-voltage power supply, then the X-ray tube can be driven with unipolar high-voltage output, but the cost increases and the switch becomes difficult to obtain
Solution Approach 1:
The patent divides the high-voltage switching function into two separate low-voltage switching operations. Instead of using one high-voltage switch, the system uses two low-voltage switches (Q1 and Q2) that control the charging and discharging of a capacitor through bipolar voltage pulses. This segmentation replaces a single expensive high-voltage switch with cheaper, more available low-voltage switching components.
Solution Approach 2:
The patent introduces a capacitor as an intermediary energy storage element between the low-voltage switches and the high-voltage X-ray tube. The capacitor charges to a high voltage through one low-voltage switch and then discharges through the other switch, acting as a mediator that enables high-voltage operation without requiring expensive high-voltage switches. This intermediary approach allows low-voltage components to control high-voltage output.
2Reliability
If conventional unipolar high voltage is applied to the anode, then the X-ray tube can operate, but residual gases and impurities cannot be effectively removed
Solution Approach 1:
The patent applies bipolar voltage pulses instead of conventional unipolar voltage. By reversing the polarity periodically (positive pulse to anode, then negative pulse to cathode), the system creates alternating electric fields that effectively remove residual gases and impurities from the X-ray tube. This inversion of the conventional unipolar approach enables both operation and purification functions.
Solution Approach 2:
The patent uses periodic bipolar voltage pulses with specific timing sequences to alternately charge and discharge the capacitor. This periodic action creates repeated polarity reversals that continuously clean residual gases and impurities while maintaining X-ray tube operation. The timing parameters (T1, T2, T3, T4) control the frequency and duration of these periodic cycles.
3Object-generated harmful factors
If bipolar regulated high-voltage pulses are applied to anode and cathode, then residual gases and impurities are eliminated, but the device complexity increases
Solution Approach 1:
The patent makes the capacitor serve multiple functions: it acts as an energy storage element for high-voltage output, a switching medium for bipolar voltage generation, and a timing reference for the control sequence. The same basic circuit components (capacitor, diodes, resistors) perform multiple roles, reducing the need for additional specialized components despite the bipolar operation complexity.
Solution Approach 2:
The circuit uses the capacitor's own charging and discharging characteristics to generate the bipolar voltage pulses automatically. The control logic leverages the natural RC time constants and voltage transitions of the capacitor to generate timing signals, reducing the need for external complex timing circuits. The system essentially uses its own operational dynamics to control itself.
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
The solution lowers the cost of driving high-voltage X-ray tubes by reducing the breakdown voltage requirements of high-voltage diodes, effectively eliminating residual gases and impurities while minimizing electromagnetic interference and allowing for adjustable timing sequences.
Implementation Method 1
a first high-frequency voltage boost circuit connecting the first output port to output first regulated positive voltage pulses by the first timing sequence of control signal; a second high-frequency voltage boost circuit connecting the second output port to output second regulated negative voltage pulses
Implementation Method 2
a driving device and a method thereof for driving a high-voltage X ray tube by positive and negative regulated high-voltage pulses exerted on the corresponding electrodes to eliminate residual side and impurities in the X ray tube
Data Source
AI summary
A method and a device for driving high-voltage X ray tube with positive and negative pulses are disclosed comprises a microprocessor unit having a first output port and a second output port, respectively outputting a first and a second timing sequence of control signals, a high-voltage X ray tube, a first high-frequency voltage boost circuit outputting a first regulated high-voltage, a first high-voltage protection circuit, a second high-frequency voltage boost circuit outputting a second high-voltage, and a second high-voltage protection circuit. The first high and the second voltages are respectively, regulated by the first timing sequence of control signal and the second timing sequence of control signal. Both regulated high-voltages are, respectively, inputted to anode and cathode of the high-voltage X ray tube vias the high-voltage protected circuits.