Anode-Rotating Coil Driver for X-Ray Tubes
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Solution Overview
Problem
Existing anode-rotating coil drivers for X-ray diagnosis systems face challenges in efficiently driving both three-phase and two-phase X-ray tubes, leading to arm short circuits and increased size and weight due to the need for isolation transformers to prevent short circuits when using two-phase alternating current.
Innovation Solution
The anode-rotating coil driver employs a configuration with serially connected capacitors and switching elements to generate both three-phase and two-phase alternating currents, eliminating the need for isolation transformers by swapping the connections of the step-up/step-down converter to step up or step down the voltage, allowing for quick anode rotation in both types of X-ray tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an isolation transformer is inserted to prevent arm short circuit when supplying two-phase alternating current, then reliability is improved, but weight and size increase
Solution Approach 1:
The patent extracts and eliminates the isolation transformer from the system by redesigning the voltage pulse generation approach. Instead of using a transformer to prevent arm short circuits, the invention uses controlled voltage pulse application with one fourth or less of the cycle width, removing the heavy isolation transformer while maintaining reliability through alternative control mechanisms.
Solution Approach 2:
The patent introduces a control mechanism that acts as an intermediary between the power source and the coils. By controlling the voltage pulse width to one fourth or less of the cycle, the system prevents arm short circuits without requiring a physical isolation transformer, thus maintaining reliability while reducing weight.
2Reliability
If voltage pulse width is reduced to one fourth or less of the cycle to prevent arm short circuit, then reliability is improved, but anode rotation speed decreases
Solution Approach 1:
The patent applies periodic voltage pulses with controlled width (one fourth or less of the cycle) to the coils. This periodic action prevents arm short circuits while maintaining sufficient effective voltage to drive anode rotation at acceptable speeds by optimizing the pulse timing and duration within each cycle.
Solution Approach 2:
The patent changes the voltage pulse width parameter to one fourth or less of the cycle duration. This parameter change prevents arm short circuits while the system compensates by optimizing pulse frequency and duty cycle to maintain adequate anode rotation speed despite the reduced pulse width.
3Device complexity
If a three-phase inverter is used to drive both three-phase and two-phase X-ray tubes, then device complexity is reduced, but arm short circuit risk increases
Solution Approach 1:
The patent makes the three-phase inverter universal by enabling it to drive both three-phase and two-phase X-ray tubes through a single configuration. The inverter can supply three-phase alternating current with 120-degree phase difference for three-phase tubes and two-phase alternating current with 90-degree phase difference for two-phase tubes, eliminating the need for separate inverters while maintaining reliability through controlled voltage pulse application.
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 solution enables efficient and rapid rotation of anodes in both three-phase and two-phase X-ray tubes without the need for isolation transformers, reducing system size and weight while preventing arm short circuits, thus improving the timing and efficiency of X-ray image acquisition.
Implementation Method 1
an anode-rotating coil driver that employs a configuration with serially connected capacitors and switching elements to generate both three-phase and two-phase alternating currents, eliminating the need for isolation transformers by swapping the connections of the step-up/step-down converter to step up or step down the voltage
Data Source
AI summary
An X-ray diagnosis system comprises an inter-capacitor terminal, a first inter-switching-element terminal, a second inter-switching-element terminal, and a third inter-switching-element terminal, wherein the first inter-switching-element terminal, the second inter-switching-element terminal, and the third inter-switching-element terminal are configured to supply three-phase alternating current power, and the inter-capacitor terminal and two of the first inter-switching-element terminal, the second inter-switching-element terminal, and the third inter-switching-element terminal are configured to supply two-phase alternating current power.