Magnetic Rocker Switch Layout for External Field Immunity
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Solution Overview
Problem
Existing contactless rocker switches are susceptible to external magnetic fields, leading to false indications when no magnet is present, causing the sensor to falsely detect the switch in either the first or third position.
Innovation Solution
A switch design incorporating a button, a magnet holder, and a printed circuit board with multiple magnet sensors, where the button positions the magnets relative to the sensors to ensure accurate positioning and minimize interference, using a combination of magnets with different polarities to maintain correct switch state detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnet and single sensor configuration is used in a contactless switch, then the device complexity is reduced, but the reliability deteriorates due to susceptibility to external magnetic fields causing false indications
Solution Approach 1:
The patent divides the single sensing function into multiple segments by using two separate magnet sensors (first magnet sensor and second magnet sensor) that independently detect magnetic fields from different magnets. This segmentation allows the system to cross-validate readings and distinguish true switch positions from external magnetic interference, thereby improving reliability without significantly increasing overall device complexity.
Solution Approach 2:
The patent introduces an intermediary control circuit that processes signals from multiple magnet sensors and multiple magnets. This intermediary layer analyzes the combined magnetic field information and determines the actual switch position by comparing readings across all sensors and magnets, filtering out false indications caused by external magnetic fields while maintaining reliable position detection.
2Reliability
If multiple magnets and multiple sensors are used to mitigate external magnetic field interference, then the reliability of switch position detection is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple magnets (first magnet, second magnet, third magnet, fourth magnet) with corresponding multiple sensors into an integrated switch assembly where all components work together as a unified system. The control circuit merges the signals from all sensors and compares them against the known positions of all magnets to determine the switch state, achieving high reliability through redundancy while managing complexity through integrated design.
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
The solution effectively mitigates external magnetic interference, ensuring accurate switch position detection and reducing false readings, thereby enhancing the reliability of contactless rocker switches.
Implementation Method 1
a contactless switch that operates by moving a magnet past a fixed magnetic sensor, such as a Hall effect IC or a magnetoresistive sensor
Implementation Method 2
a contactless switch that operates by moving a magnet past a fixed magnetic sensor, such as a Hall effect IC or a magnetoresistive sensor
Data Source
AI summary
A rocker switch includes a rocker switch housing and a first magnet sensor. The rocker switch further includes a button rotatably mounted to the rocker switch housing about a first axis. The rocker switch also includes a magnet holder in contact with the button and rotatably mounted to the rocker switch housing about a second axis different from the first axis. The magnet holder holds a first magnet having a first polarity and a second magnet having a second polarity different from the first polarity. When the button is in a first button position, the button biases the magnet holder to a first magnet holder position, in which the first magnet is proximate to the magnet sensor. When the button is in a second button position, the button biases the magnet holder to a second magnet holder position, in which the second magnet is proximate to the magnet sensor.