Connection and Moisture Detection Circuit for Electronic Contacts
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Solution Overview
Problem
Electronic devices face challenges in detecting connections and moisture presence at contacts, which can lead to corrosion and damage, especially when exposed to liquids or contaminants during use.
Innovation Solution
A circuitry system that detects the presence of an accessory and moisture at the connection by using a current source to generate a ramp voltage, with a threshold check and decay analysis to determine if an accessory is connected and if excessive moisture is present, thereby enabling or disabling charging to prevent corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate circuits are used to detect connection and moisture, then detection accuracy is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent combines connection detection and moisture detection into a single circuit that performs both functions. The circuit uses a current source to generate a ramp voltage and measures the time to reach a threshold voltage to detect both accessory presence and moisture contamination simultaneously, eliminating the need for separate detection circuits and reducing power consumption.
Solution Approach 2:
The detection circuit is designed to perform multiple functions: it detects both the presence of an accessory and the presence of moisture contamination using the same hardware components. The circuit can operate in different modes (connection detection mode and moisture detection mode) depending on the operational state, making it a universal detection system.
2Measurement precision
If separate circuits are used to detect connection and moisture, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges connection detection and moisture detection into a single integrated circuit. The same current source, voltage threshold comparator, and timing circuitry are used for both detection functions, significantly reducing the number of components and simplifying the overall device architecture while maintaining detection accuracy.
Solution Approach 2:
The detection circuit is designed as a universal system that can detect both accessory connection and moisture contamination using the same hardware. The circuit transitions between different detection modes based on operational requirements, reducing device complexity by eliminating redundant components.
3Productivity
If charging is enabled without moisture detection, then productivity is improved, but contact corrosion and damage occur
Solution Approach 1:
The patent performs moisture detection before enabling charging operations. The circuit detects moisture contamination on contacts prior to initiating power transfer, and only allows charging when contacts are dry and safe. This preliminary detection prevents corrosion and damage while maintaining charging productivity when conditions are favorable.
Solution Approach 2:
The patent converts the potentially harmful presence of moisture into a useful detection signal. By measuring the time for ramp voltage to reach threshold, the circuit identifies moisture contamination and uses this information to prevent harmful charging operations, turning a harmful factor into a protective mechanism.
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 reduces power consumption and resource usage while ensuring the detection of connections and moisture, allowing for safe charging and preventing damage to contacts by accurately determining the presence of accessories and excessive moisture.
Implementation Method 1
An accessory can have a known capacitor connected to an accessory contact that mates with the docking station contact. When the accessory and the known capacitor are mated with the docking station, the current can generate a ramp voltage.
Implementation Method 2
A pull-down resistor can be connected to the docking station contact to ensure that the ramp voltage decays once the current source is disabled.
Implementation Method 3
If moisture is present, the moisture can provide an additional pull-down resistance, thereby causing the ramp voltage to decay more quickly.
Data Source
AI summary
Methods, structures, and apparatus that are able to detect the presence of a connection to a contact of an electronic device and are also able to detect the presence of moisture at the contact.