Wireless Charging Pad Venting for Fast Charging Heat Control
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Solution Overview
Problem
Conventional wireless charging devices generate excessive heat during operation, leading to reduced charging power and speed due to thermal resistances and heat transfer to the mobile device, which can exceed critical temperature thresholds.
Innovation Solution
A wireless charging device with a casing design featuring protrusion portions, gaps, and airflow channels, along with a fan, to enhance heat dissipation by increasing thermal resistances and facilitating airflow to dissipate heat generated by the transmitter coil, driving board, and mobile device components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmitter coil and mobile device are placed close together for wireless charging, then charging efficiency is improved, but heat transfer from the transmitter coil to the mobile device increases
Solution Approach 1:
The patent divides the internal space into multiple independent chambers (first chamber for transmitter coil, second chamber for receiver coil, third chamber for driving board) using partition plates. This segmentation isolates heat sources from the mobile device while maintaining close proximity for efficient electromagnetic coupling, thus improving charging efficiency without excessive heat transfer.
Solution Approach 2:
The patent introduces airflow channels and fans as intermediary heat dissipation systems between the heat-generating components and the mobile device. The airflow acts as a thermal mediator that carries heat away from the transmitter coil and driving board, preventing direct heat transfer to the mobile device while allowing close placement for charging efficiency.
2Productivity
If high power is used for fast charging, then charging speed is improved, but heat generation increases
Solution Approach 1:
The patent segments the high-power components (transmitter coil, driving board) into separate enclosed chambers with dedicated airflow paths. This allows high power operation for fast charging while isolating the generated heat within specific zones where it can be efficiently dissipated through the fan-driven airflow, preventing heat accumulation that would limit charging power.
Solution Approach 2:
The patent employs a fan-driven pneumatic cooling system with airflow channels to actively remove heat generated during high-power fast charging. The forced airflow through the chambers containing heat-generating components enables sustained high power operation by continuously dissipating thermal energy, thus maintaining fast charging speed without excessive heat buildup.
3Temperature
If heat dissipation structures are added to the wireless charging device, then heat dissipation performance is improved, but device complexity increases
Solution Approach 1:
The patent uses partition plates to divide the casing into functional chambers, which simultaneously serve as heat dissipation pathways. This segmentation approach organizes the heat dissipation structure in a systematic way that improves thermal management while maintaining reasonable structural complexity through modular design.
Solution Approach 2:
The partition plates and casing walls serve dual functions: they provide structural support for the electronic components and simultaneously form heat dissipation channels for airflow. This multi-functionality reduces the need for separate heat dissipation structures, thereby improving heat dissipation performance without proportionally increasing device complexity.
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 design effectively maintains the mobile device temperature within tolerance limits, enhancing charging power and speed while improving overall heat dissipation performance.
Implementation Method 1
The transmitter coil assembly is disposed in the first accommodation space and electromagnetically coupled with the receiver coil. The transmitter coil assembly receives the driving electric energy from the transmitter driving board and transfers the driving electric energy to the receiver coil during the operation of the wireless charging device
Implementation Method 2
The airflow flowing through the first airflow channel is inhaled to the fan through the inlet and discharged out through the outlet
Data Source
AI summary
A wireless charging device is provided. The plurality of protrusion portions are utilized to form the first gap between the top plate and the mobile device, so as to increase the distance formed between the top plate and the mobile device. Consequently, the first interfacial thermal resistance formed between the transmitter coil assembly and the receiver coil located in the mobile device is increased, and the second heat source generated from the transmitter coil assembly is dissipated through the wireless charging device instead of being transferred to the receiver coil located in the mobile device. In that, the temperature of the mobile device is controlled to be under the tolerance temperature threshold value during the charging process of the wireless charging device. Consequently, the charging power is enhanced, and the charging speed is increased.