Rotary Switch State Detection via Gravity and Magnetic Sensing
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Solution Overview
Problem
Rotary switches in appliances like gas stoves and microwave ovens face issues with precise control due to potential fuel gas leaks and inaccurate resistive control, leading to safety concerns and reduced precision over time.
Innovation Solution
A rotary switch state detection device utilizing a gravity sensing unit and a processing unit to detect gravity value variations, optionally combined with a magnetic field generating and sensing unit, to accurately locate the rotation head and determine the switch's state, with a signal output and cloud server for abnormal state alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable resistor is used for control, then the control range is extended, but the control precision deteriorates and errors are generated
Solution Approach 1:
The patent replaces the mechanical variable resistor system with a magnetic field-based detection system. A magnet is attached to the rotary switch shaft, and a magnetic sensor detects the magnet's position to determine the switch state. This substitution eliminates the inherent precision errors of resistive control while maintaining the full range of rotational control, as the magnetic field detection can accurately sense position without the physical contact and resistance variations that plague mechanical systems.
2Adaptability or versatility
If a rotary switch is used for segmented control, then the control functionality is improved, but the reliability deteriorates due to potential fuel gas leaks and failure after long use
Solution Approach 1:
The patent eliminates mechanical contact components by using magnetic field detection. The magnet attached to the rotary switch shaft interacts with a magnetic sensor without physical contact, eliminating wear and tear that occurs in traditional mechanical switches. This non-contact detection method maintains the segmented control functionality while significantly improving reliability by removing the mechanical failure modes that occur after prolonged use.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the rotary switch shaft and the detection system. Instead of direct mechanical contact or electrical contact through brushes and resistors, the magnet on the shaft creates a magnetic field that the magnetic sensor detects. This intermediary field transmission method eliminates the harmful physical and chemical interactions that lead to fuel gas leaks and mechanical failure, while preserving the control functionality.
3Device complexity
If traditional detection methods are used, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent replaces complex mechanical detection mechanisms with a simple magnetic field detection system. Instead of using variable resistors, potentiometers, or mechanical switches that require multiple components and calibration, the system uses a magnet and magnetic sensor that provide precise position detection with minimal components. The magnet follows the rotary switch shaft rotation, and the magnetic sensor accurately detects the magnet's angular position, achieving high precision with reduced 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
Enables precise determination of the rotary switch's state, preventing potential accidents by ensuring timely shut-off and maintaining precise control, while reducing wear and tear-related failures.
Implementation Method 1
a gravity sensing unit disposed at the rotation head of the rotary switch to detect a gravity value and generate a gravity strength signal accordingly
Implementation Method 2
a magnetic field generating unit and a magnetic force sensing unit. The magnetic field generating unit is fixed in place to enclose the rotary switch and generate a magnetic field around the rotary switch. The magnetic force sensing unit is disposed at the rotary switch to detect a magnetic force value of the magnetic field
Data Source
AI summary
A rotary switch state detection device includes a magnetic field generating unit, a gravity sensing unit, a magnetic force sensing unit and a processing unit. The magnetic field generating unit generates a magnetic field. The magnetic force sensing unit and the gravity sensing unit are disposed at a rotary switch to detect a gravity value and a magnetic force value of the magnetic field and generate a gravity strength signal and magnetic field strength signal, respectively. The processing unit is connected to the gravity sensing unit and the magnetic force sensing unit to calculate a gravity value variation and a magnetic force value variation and thereby precisely locate a rotation head of the rotary switch upon completion of rotation thereof.