Handheld Fan Circuit Layout for Airflow-Driven Heat Dissipation
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Solution Overview
Problem
High-speed handheld fans suffer from poor heat dissipation due to thermal generation in the single circuit board, adversely affecting their service life.
Innovation Solution
The handheld fan design separates the motor circuit board and control circuit board, with the motor circuit board being positioned in the air duct portion to facilitate rapid airflow-driven heat dissipation, while the control circuit board and battery are in the hand grip portion, forming a T-shaped structure with a convection airflow design and protective grilles at the air inlet and outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single circuit board is used in high-speed handheld fans, then device complexity is reduced, but thermal generation increases and heat dissipation becomes insufficient
Solution Approach 1:
The circuit board is divided into two separate components: a motor circuit board and a control circuit board. The motor circuit board is positioned in the air duct portion where it can be cooled by airflow, while the control circuit board is placed in the hand grip portion. This segmentation allows each circuit board to be optimally positioned for its thermal management needs, resolving the contradiction between simplicity and heat dissipation effectiveness.
2Temperature
If the motor circuit board is positioned in the air duct portion, then heat dissipation efficiency is improved, but device complexity increases
Solution Approach 1:
The motor circuit board is merged with the motor assembly in the air duct portion, utilizing the existing airflow path for heat dissipation. The control circuit board is merged with the battery assembly in the hand grip portion. This merging approach minimizes additional structural complexity while achieving effective thermal management through strategic component co-location.
3Speed
If high rotational speed is used in the motor, then airflow performance is improved, but thermal generation in the circuit board increases
Solution Approach 1:
The motor circuit board is extracted from the control circuit board and positioned separately in the air duct portion. This extraction allows the motor circuit board to be directly cooled by the high-speed airflow generated by the motor, while the control circuit board remains in a separate location. The harmful thermal effect is thus localized and efficiently managed, allowing high rotational speeds to be maintained without compromising circuit board reliability.
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 effectively disperses heat generated by the motor circuit board, prolonging the fan's service life by ensuring efficient heat dissipation and maintaining airflow performance.
Implementation Method 1
the motor circuit board is positioned in the air duct portion to facilitate rapid airflow-driven heat dissipation
Implementation Method 2
a motor is disposed in the air duct portion
Data Source
AI summary
A handheld fan is provided, including a housing body. The housing body includes a hand grip portion, an air duct portion is disposed in the housing body, a motor is disposed in the air duct portion, a motor circuit board is disposed on the motor, and the motor circuit board is electrically connected to the motor. A control circuit board and a battery are further disposed in the housing body, the control circuit board is electrically connected to the motor circuit board, and the control circuit board is electrically connected to the battery. According to the above structural configuration of the handheld fan, the motor circuit board and control circuit board are separately disposed in the housing body, so that heat generated by the motor circuit board and control circuit board is distributed across distinct components. Additionally, the motor circuit board is independently disposed on the motor.