High-Voltage Resonant Generator Control for Stable Wide Output Range
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Solution Overview
Problem
Existing X-ray tube high voltage generators face challenges in providing a wide range of output voltage and current while maintaining stability and reducing the volume and noise, due to the limitations of switch transistors like IGBTs and the need for resonant circuits to operate over a wide range of frequencies.
Innovation Solution
A high voltage generator design that includes an inverter circuit, a resonant circuit, a transformer, and a phase control circuit to maintain the resonant circuit in an inductive region, using control signals to operate within specific resonant frequency peaks and employing an amplitude limiting circuit to prevent frequency instability, allowing for efficient operation between the upper and lower resonance peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resonant circuits operate over a wide range of frequencies to accommodate wide range of input and output voltages, then adaptability is improved, but stability deteriorates and loss increases
Solution Approach 1:
The resonant circuit is divided into two separate resonant circuits with different resonant frequencies. The first resonant circuit operates at a higher frequency for high voltage output, while the second resonant circuit operates at a lower frequency for low voltage output. This segmentation allows each circuit to operate stably within its optimized frequency range, avoiding the instability and losses associated with operating a single circuit across a wide frequency range.
Solution Approach 2:
The system dynamically switches between two resonant circuits based on the required output voltage. The control circuit determines which resonant circuit to activate based on real-time voltage requirements, allowing the system to adapt to varying voltage demands while maintaining optimal operating conditions for each circuit. This dynamic switching resolves the contradiction by preventing any single circuit from operating outside its stable frequency range.
2Productivity
If switch transistor frequency is increased to reduce generator volume, then productivity is improved, but loss of energy increases
Solution Approach 1:
The system segments the operating frequency range into two distinct bands, each handled by a dedicated resonant circuit. The first resonant circuit operates at higher frequencies (better for compactness) when high voltage output is needed, while the second resonant circuit operates at lower frequencies (better for efficiency) when low voltage output is needed. This segmentation allows the system to achieve both high productivity and low energy loss by matching the operating frequency to the specific output requirements.
3Reliability
If resonant circuit operates at lower frequencies to reduce noise and increase stability, then reliability is improved, but volume increases
Solution Approach 1:
The system dynamically selects between two resonant circuits based on operational requirements. When high voltage output is needed, the first resonant circuit operates at higher frequency, resulting in a more compact generator volume. When low voltage output is needed, the second resonant circuit operates at lower frequency, providing enhanced stability and reduced noise. This dynamic configuration allows the generator to achieve both compact size and reliability by using the appropriate circuit for each operating condition.
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 design achieves a wide range of output power within a narrow frequency range, ensuring stability and reducing switching loss, thereby addressing the limitations of prior art generators in terms of size, noise, and frequency operation.
Implementation Method 1
the resonant circuit includes at least an inductor serially connected to a capacitor
Data Source
AI summary
A high voltage generator is provided. The high voltage generator includes an inverter circuit coupled to receive a direct-current (DC) input voltage, a resonant circuit coupled to the inverter circuit, a transformer coupled to the resonant circuit and also coupled to provide a high voltage output to a high voltage device, and a phase control circuit coupled to receive a voltage across and a current through the resonant circuit and also coupled to the inverter circuit. The phase control circuit generates control signals to drive the inverter circuit. The control signals drive the inverter circuit to keep the resonant circuit operating in an inductive region.