Thermal Conductive Metal Screen for On-Board Telematics Cooling
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Solution Overview
Problem
On-board telematics devices face challenges in efficiently cooling power electronic components, particularly in high-temperature environments, as traditional methods like heat sinks or heat pipes increase cost, size, and weight, and using thermally conductive materials for the entire case is expensive.
Innovation Solution
A metal screen made of thermally conductive material, such as steel, aluminum, or zamak, is used to isolate radiofrequency antennas from electronic components while also serving as a heat transfer means between power electronics components and the metal vehicle body, leveraging the body as a heat sink for thermal dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat sink is integrated in the on-board telematics device to cool power electronics components, then the cooling effectiveness is improved, but the cost, size and weight of the device increase
Solution Approach 1:
The metal screen is designed to perform multiple functions simultaneously: it provides electromagnetic shielding between the antenna and electronic components while also serving as a heat transfer means to conduct heat from the power electronics components to the metal vehicle body. This eliminates the need for a separate heat sink, reducing device weight and cost.
2Temperature
If a heat sink is integrated in the on-board telematics device to cool power electronics components, then the cooling effectiveness is improved, but the cost, size and weight of the device increase
Solution Approach 1:
The metal screen serves dual purposes as both an electromagnetic shield and a thermal conduction path. By integrating the heat transfer function into the existing shielding structure, the device avoids the additional space requirements of a separate heat sink, thereby reducing overall device size.
3Temperature
If the casing is made of material with good thermal conductivity to perform cooling function, then the cooling effectiveness is improved, but the manufacturing cost increases
Solution Approach 1:
Instead of making the entire casing from expensive thermally conductive material, the invention applies thermal conductivity locally where needed. The metal screen is positioned specifically between the power electronics components and the vehicle body to create a targeted heat transfer path, while the rest of the casing can use less expensive materials.
4Object-affected harmful factors
If a metal screen is used to isolate the antenna from electronic components, then the electromagnetic shielding performance is improved, but the heat dissipation capability deteriorates
Solution Approach 1:
The metal screen is designed to perform multiple functions simultaneously: it provides electromagnetic shielding between the antenna and electronic components while also serving as a heat transfer means to conduct heat from the power electronics components to the metal vehicle body. This eliminates the need for a separate heat sink, reducing device weight and cost.
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 approach effectively dissipates heat from power electronics components to the metal vehicle body, reducing temperature increases and avoiding the costs and weight associated with traditional cooling methods, while maintaining electrical continuity and shielding performance.
Implementation Method 1
said screen is made of thermal conductive material so as to form a heat transfer means between the power electronics component and the metal part
Data Source
Figure 1(a)~2(b)
Figure 3
AI summary
An on-board telematic device intended to be attached to a metal part (3) of a body of a motor vehicle comprises, according to the invention, a housing (1) integrating a printed circuit board (5), a face of which supports at least one electronic power component (6), a radiofrequency antenna (7), intended to extend through an opening of the metal part (3), and a metal screen (9) interposed between a lower part of the antenna (7), on the one hand, and the printed circuit board (5) and said at least one component, on the other hand, in order to isolate the antenna from parasitic emissions. The component (6) is placed in line with the metal screen (9) and in thermal contact with a portion of said screen, and said screen (9) is made of a thermally conductive material so as to form a thermal transfer means between the electronic power component (6) and the metal part (3).