Projector Fan Protection via Acceleration Detection
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Solution Overview
Problem
Portable projecting devices face a trade-off between increasing resolution and brightness, which raises power consumption and requires larger, more powerful heat dissipation fans, compromising their anti-falling capability and portability.
Innovation Solution
A method and apparatus that utilize real-time fall-related information from acceleration sensors to determine the fall state of the heat dissipation fan, terminating its operation during a fall to prevent damage and allowing it to resume operation after the fall has stopped, enabling the use of more powerful fans while maintaining portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat dissipation fan with larger diameter and more power is used to effectively dissipate heat, then heat dissipation performance is improved, but anti-falling capability is significantly reduced
Solution Approach 1:
The system performs preliminary detection of fall conditions using acceleration sensors before the fan is damaged. By detecting acceleration changes that indicate a fall is occurring, the system can proactively stop the fan motor before the falling device impacts the fan, thus preventing damage while allowing the use of more powerful fans for better heat dissipation
Solution Approach 2:
The acceleration sensor acts as an intermediary between the physical fall event and the fan control system. It detects mechanical acceleration changes and converts them into electrical signals that trigger the control logic to stop the fan, providing a buffer between the harmful fall event and the vulnerable fan component
2Reliability
If a low-power heat dissipation fan is used to maintain anti-falling capability, then reliability is improved, but heat dissipation performance deteriorates
Solution Approach 1:
The system changes the operational parameters of the fan based on detected conditions. During normal operation, the fan can run at high speed for optimal heat dissipation. When a fall is detected through acceleration sensing, the system changes the fan's operational state to stopped, preventing damage. This dynamic parameter adjustment allows the system to achieve both high heat dissipation performance and reliability
3Temperature
If auxiliary heat dissipation devices are added to compensate for fan power limitations, then heat dissipation performance is improved, but device volume increases
Solution Approach 1:
The invention extracts the fall detection function from the overall control system and implements it through dedicated acceleration sensors. This allows the system to use a single, more powerful fan without requiring multiple auxiliary heat dissipation devices, as the protection mechanism is integrated into the control logic rather than requiring additional physical heat dissipation components
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 protects the heat dissipation fan from damage during falls, allowing for the use of more powerful fans while ensuring the device's portability and continued heat dissipation functionality.
Implementation Method 1
obtaining time information and acceleration information in real time via a two-axis or three-axis acceleration sensor when the projecting device is falling
Data Source
AI summary
Disclosed is a method for protecting a heat dissipation fan of a projecting device, including: when a heat dissipation fan is in a working state, obtaining fall-related information when a projecting device is falling; determining fall-related information of the heat dissipation fan according to the fall-related information of the projecting device; terminating the operation of the heat dissipation fan when the fall state information of the heat dissipation fan is in a falling state; resuming the operation of the heat dissipation fan when the fall state information of the heat dissipation fan is that the fall ends. Further disclosed is an apparatus for protecting a heat dissipation fan of a projecting device, corresponding to the method.