Humidity Detection and Power Cut-off Device for Electronic Equipment
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Solution Overview
Problem
Existing electronic equipment lacks protection against water and humidity damage, leading to potential short circuits and destruction when exposed to damp environments, with existing solutions only applicable to batteries with pre-installed short circuit protection circuits.
Innovation Solution
A humidity detection and power cut-off device connected between a battery and a motherboard, featuring a moisture-trigger device with a humidity sensor and comparison circuit to detect ambient humidity and trigger a switch circuit to disconnect power when exceeding a critical humidity value, using P-channel EMOSFETs and a lock circuit to maintain disconnection until the battery is reattached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no protection device is installed, then the device complexity is low, but the reliability of electronic equipment against humidity damage is poor
Solution Approach 1:
The protection device is divided into distinct functional modules: a humidity sensor for detecting ambient humidity, a comparison circuit for evaluating sensor output against reference values, and a switch circuit for executing power cut-off. This segmentation allows each component to perform its specific function efficiently while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The device performs preliminary detection of humidity levels before damage occurs. The humidity sensor continuously monitors the environment, and the comparison circuit prepares trigger signals in advance when critical thresholds are approached, enabling proactive protection rather than reactive response.
2Reliability
If a pre-installed short circuit protection circuit is used in batteries, then the reliability against water damage is improved, but the adaptability to different battery types is reduced
Solution Approach 1:
The protection function is extracted from the battery itself and placed in a separate, external device that interfaces between the battery and motherboard. This external humidity detection and power cut-off device can work with any battery type without requiring pre-installation or modification of the battery, thereby maintaining both reliability and adaptability.
Solution Approach 2:
The protection device acts as an intermediary component between the battery and the motherboard. It monitors humidity conditions and controls power flow without being part of the battery structure, enabling universal compatibility across different battery types while providing robust protection against water and humidity damage.
3Reliability
If automatic power cut-off is implemented, then the reliability of equipment protection is improved, but the loss of time for equipment restart increases
Solution Approach 1:
The protection device automatically detects humidity conditions and triggers power cut-off without requiring user intervention. When the humidity level returns to safe ranges, the system can be quickly reactivated by simply reinserting the battery, allowing the equipment to resume normal operation without manual reset procedures or extended downtime.
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
Effectively prevents damage from unsuitable humidity environments by automatically shutting down electronic equipment when humidity exceeds safe levels, ensuring the equipment remains powered off until the battery is reattached, thus protecting the equipment from water and humidity damage.
Implementation Method 1
The humidity sensor is used for sensing an immediate ambient humidity and outputting a voltage value corresponding to the immediate ambient humidity
Implementation Method 2
The switch circuit is used for establishing or cutting off a connection between the battery and the motherboard
Data Source
AI summary
A humidity detection and power cut-off device for electronic equipment is provided. The device is connected between a battery (10) and a motherboard (40) of the electronic equipment and includes an auto protection device (20) and a moisture-triggered device (30). The auto protection device is connected between the battery and the power management module and is used to establish or cut off the connection between the battery and the power management module. The moisture-triggered device is used to detect the immediate ambient humidity and controls the auto protection device. If the moisture-triggered circuit detects that the immediate ambient humidity exceeds a predetermined critical humidity value, the moisture-triggered device outputs a trigger signal to the auto protection device. The trigger signal controls the auto protection circuit to cut off a connection between the battery and the power management module, thus to achieve waterproofing protecting for the electronic equipment.