Cryostat Protection Diode Orientation for Quench Voltage Control
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Solution Overview
Problem
In superconducting magnet devices, the protection diode is often exposed to strong magnetic fields due to spatial constraints, leading to an increase in forward voltage, which can result in excessive voltage application and a risk of discharge or ground fault during quenching events.
Innovation Solution
The protection diode is strategically disposed within the cryogenic environment such that the direction of the magnetic field generated by the superconducting coil forms an angle of about 30 degrees with respect to the normal line of the pn junction surface, reducing the influence of the magnetic field on the forward voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protection diode is disposed in the cryogenic environment connected to the superconducting coil, then the protection function is provided, but the forward voltage increases due to exposure to strong magnetic fields
Solution Approach 1:
The patent applies local quality by orienting the pn junction surface of the protection diode at a specific angle (30-60 degrees) relative to the magnetic field direction. This localized geometric adjustment at the critical interface (pn junction surface) reduces the magnetic field's harmful impact on forward voltage while preserving the diode's protection function in the cryogenic environment.
Solution Approach 2:
The patent changes the orientation parameter of the protection diode's pn junction surface relative to the magnetic field. By adjusting this geometric parameter to form a specific angle (30-60 degrees), the magnetic field's influence on the forward voltage is reduced, allowing the diode to operate reliably in the strong magnetic field environment near the superconducting coil.
2Speed
If the protection diode is disposed close to the superconducting coil, then the protection response is faster, but the magnetic field exposure increases causing excessive voltage
Solution Approach 1:
The patent applies local quality by optimizing the orientation of the pn junction surface at the critical interface of the protection diode. This localized geometric adjustment allows the diode to be positioned close to the superconducting coil for fast response while the specific angle (30-60 degrees) minimizes the magnetic field's impact on forward voltage at the junction surface.
Solution Approach 2:
The patent introduces asymmetry in the orientation of the protection diode relative to the magnetic field. Instead of aligning the pn junction surface perpendicular or parallel to the magnetic field, it is angled at 30-60 degrees, creating an asymmetric configuration that reduces magnetic field impact while maintaining close proximity to the superconducting coil for fast protection response.
3Object-affected harmful factors
If the forward voltage is suppressed, then the discharge risk is reduced, but the diode operation becomes more constrained
Solution Approach 1:
The patent changes the orientation parameter of the pn junction surface to reduce forward voltage increase. By setting the angle between the magnetic field direction and the normal of the pn junction surface to 30-60 degrees, the magnetic field's harmful effect is minimized, suppressing forward voltage increase and reducing discharge risk while maintaining proper diode operation.
Solution Approach 2:
The patent applies local quality by adjusting the orientation specifically at the pn junction surface where the magnetic field has the greatest impact. This localized geometric optimization reduces forward voltage increase and discharge risk at the critical interface while maintaining overall diode functionality and ease of operation in the cryogenic environment.
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 configuration suppresses the increase in forward voltage, ensuring the protection diode operates at an appropriate voltage, thereby reducing the risk of discharge or ground fault during quenching events.
Implementation Method 1
a direction of a magnetic field generated by the superconducting coil on a pn junction surface of the protection diode
Implementation Method 2
a superconducting coil disposed in a cryogenic environment, and a protection diode disposed in the cryogenic environment
Data Source
AI summary
A superconducting magnet device includes a superconducting coil disposed in a cryogenic environment; and a protection diode disposed in the cryogenic environment and connected to the superconducting coil, the protection diode being disposed such that a direction of a magnetic field generated by the superconducting coil on a pn junction surface of the protection diode forms an angle within about 30 degrees with respect to a normal line of the pn junction surface.