CT Gantry Boost Converter for Constant Rotation During X-Ray Load
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Solution Overview
Problem
The rotational speed of a CT imaging system's gantry is compromised when the X-ray source is activated due to voltage sag, leading to uncontrolled speed reduction and impaired image quality.
Innovation Solution
A boost converter circuitry is integrated between the gantry motor and input terminals to maintain a constant voltage, using high-frequency Silicon Carbide MOSFET switches to stabilize the gantry speed during X-ray generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the X-ray source is activated to generate X-rays, then the X-ray generation function is improved, but the gantry rotational speed deteriorates due to voltage sag
Solution Approach 1:
A boost converter circuit is introduced as an intermediary power conversion device between the power distribution unit and the gantry motor. The boost converter maintains a constant voltage output (e.g., 650V DC) regardless of voltage sags caused by X-ray source activation, thereby preserving the gantry motor's rotational speed while allowing full power to the X-ray source
Solution Approach 2:
The system changes the voltage parameter delivery method to the gantry motor by using a boost converter that actively regulates and maintains constant voltage output. This parameter stabilization ensures the motor receives consistent power despite fluctuations in the main power supply when the X-ray source draws large current
2Speed
If the gantry motor is powered at maximum speed, then the gantry rotational speed is improved, but the input voltage sags below the reaction voltage when X-ray source is activated
Solution Approach 1:
The patent replaces the direct electrical connection and natural voltage distribution system with an electronically controlled boost converter system. This electronic substitution allows precise voltage regulation through feedback control, replacing the passive electrical system that previously allowed voltage sag to occur
Solution Approach 2:
The boost converter incorporates feedback control mechanisms that continuously monitor the output voltage and adjust the switching duty cycle accordingly. This feedback ensures the output voltage remains constant at the required level (e.g., 650V DC) even when input voltage fluctuates due to X-ray source activation
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 gantry maintains a constant rotational speed of 0.234 seconds/revolution, ensuring high-quality imaging by preventing voltage drops and maintaining image clarity.
Implementation Method 1
a boost converter circuitry coupled to the PDU to maintain a voltage output of the PDU during generation of X-rays by the X-ray source
Data Source
AI summary
Various methods and systems are provided for an imaging system including a an X-ray source generating X-rays; an X-ray detector positioned opposite of the X-ray source for receiving X-rays; a gantry rotatably positioned within a gantry enclosure; a gantry motor coupled to the gantry to rotate the gantry; a power distribution unit (PDU) coupled to the gantry to provide power to the gantry; and a boost converter circuitry coupled to the PDU to maintain a voltage output of the PDU during generation of X-rays by the X-ray source. The method of providing power, via the PDU, to a gantry motor to rotate the gantry; providing power, via the PDU, to the X-ray source; and activating the boost converter circuitry to provide a voltage regulation to the gantry motor rotating the gantry via a gantry motor drive at a constant rotational speed.