Cryogenic Cooling for Electromagnetic Induction Filters
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Solution Overview
Problem
Existing electromagnetic interference (EMI) filters face challenges in maintaining optimal operational temperatures, especially in compact spaces, as airflow-based cooling methods become insufficient with the miniaturization of electrical components, leading to performance degradation and potential damage due to high temperatures.
Innovation Solution
A cooling device for EMI filters is designed with a housing that includes exterior and central flow channels, interconnected to optimize coolant flow and heat transfer, using liquid nitrogen as a cryogenic fluid pumped through the system to maintain efficient heat dissipation, with the magnetic core exposed to the coolant while keeping the wire segments isolated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If airflow cooling is used for EMI filters, then the filter can be cooled in a simple manner, but the cooling effectiveness becomes insufficient in compact spaces and high thermal load conditions
Solution Approach 1:
The patent transitions from airflow cooling to liquid coolant cooling by introducing a cooling fluid circulation system with pump, heat exchange channels, and fluid distribution paths. The liquid coolant system provides superior heat transfer capability compared to airflow, resolving the contradiction between cooling simplicity and cooling effectiveness in compact high-power EMI filters.
Solution Approach 2:
The patent changes the physical state of the cooling medium from gas (airflow) to liquid (coolant), fundamentally improving the heat transfer parameter. This parameter change enables effective cooling in compact spaces where airflow cooling becomes insufficient due to space constraints and thermal load density.
2Volume of moving object
If the EMI filter is miniaturized to reduce space, then the device size decreases, but the thermal management becomes increasingly difficult
Solution Approach 1:
The patent embeds the cooling fluid channels and heat exchange structures within the EMI filter housing and magnetic core assembly, creating a nested configuration. The cooling channels are integrated into the filter structure itself, allowing compact miniaturization while maintaining effective thermal management through direct contact cooling paths.
Solution Approach 2:
The patent introduces cooling fluid as an intermediary heat transfer medium that directly contacts the magnetic core and winding assemblies. This liquid intermediary provides efficient heat extraction from the compact miniaturized components, solving the thermal management problem that arises when filter size is reduced.
3Reliability
If cryogenic cooling is implemented to maintain optimal temperatures, then the filter performance and lifespan are improved, but the system complexity and manufacturing difficulty increase
Solution Approach 1:
The patent designs the cooling system to be self-contained within the EMI filter housing, with integrated pump, channels, and fluid distribution. The system serves itself by incorporating all necessary cooling components within the filter assembly, reducing external complexity while maintaining reliable cryogenic cooling for optimal performance and extended lifespan.
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 effectively manages high thermal loads, maintaining the EMI filter's performance and extending its operational lifespan by ensuring efficient heat transfer and reducing the need for cryogenic potting materials, while being compatible with cryogenic fluids and ensuring electrical safety.
Implementation Method 1
using liquid nitrogen as a cryogenic fluid pumped through the system to maintain efficient heat dissipation
Implementation Method 2
The one or more central flow channels, the peripheral flow channels, and the one or more exterior chambers are interconnected... ensuring efficient heat transfer
Data Source
AI summary
Provided is a cooling device, and methods of fabricating and operating such cooling devices, for electromagnetic induction (EMI) filters. Specifically, a cooling device is provided which comprises a housing enclosing the electromagnetic induction filter. The housing may comprise one or more of the following: one or more exterior chambers, one or more central flow channels, and peripheral flow channels. The one or more exterior chambers surround an exterior surface of the EMI filter. The one or more central flow channels extend the length of the center of the EMIR filter. The peripheral flow channels extend the length of the exterior of the electromagnetic induction filter. The peripheral flow channels may be disposed between one or more exterior chambers and open into the one or more exterior chambers. The one or more central flow channels, the peripheral flow channels, and the one or more exterior chambers are interconnected.