Swipeable Computer Capacitive Trigger for Magnetic Sensor Power
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Solution Overview
Problem
Dynamic magnetic stripe cards face challenges in reducing power consumption for swipe detection without compromising the frequency of false alarms and timing accuracy, due to limited space for batteries in devices designed to match standard credit card dimensions.
Innovation Solution
A swipeable computer equipped with a capacitive detector and a switchable magnetic field sensor, where the logic unit enables the magnetic field sensor only when a standard capacitance change is detected, allowing for efficient power usage by minimizing the activation time of the magnetic field sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic field sensor is continuously activated for swipe detection, then the timing accuracy and false alarm detection are improved, but the power consumption increases significantly
Solution Approach 1:
The magnetic field sensor is activated periodically only during capacitive touch events rather than continuously. The control circuit enables the magnetic field sensor to operate in discrete intervals triggered by capacitive detector events, reducing overall power consumption while maintaining detection capability when needed.
Solution Approach 2:
The capacitive detector performs preliminary detection to identify potential swipe events before activating the magnetic field sensor. This preliminary action filters out unnecessary sensor activations, ensuring the magnetic field sensor operates only when a capacitive event suggests a genuine swipe attempt, thereby reducing false alarms and power consumption.
2Reliability
If the magnetic field sensor is activated more frequently to reduce false alarms, then the reliability of swipe detection is improved, but the power consumption increases
Solution Approach 1:
The control circuit uses feedback from the capacitive detector to intelligently control magnetic field sensor activation. By analyzing capacitive touch patterns and comparing them against stored swipe templates, the system determines whether magnetic field sensing is necessary, reducing false alarms while minimizing unnecessary sensor activation and power consumption.
Solution Approach 2:
The system dynamically adjusts magnetic field sensor activation based on real-time capacitive detector readings. Rather than using a fixed activation schedule, the control circuit adapts sensor operation to actual usage conditions, enabling the sensor only when capacitive events match expected swipe patterns, thereby optimizing both reliability and power efficiency.
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 approach reduces power consumption while maintaining the accuracy and low frequency of false alarms, enabling effective swipe detection in magnetic card readers.
Implementation Method 1
A swipeable computer equipped with a capacitive detector and a switchable magnetic field sensor, where the logic unit enables the magnetic field sensor only when a standard capacitance change is detected
Implementation Method 2
enabling a magnetic field sensor if the change in capacitance corresponds to the standard capacitance change. After the magnetic field sensor is enabled, the method includes sensing a magnetic field change
Data Source
AI summary
The present invention relates devices and methods using swipe detection. A swipeable computer of the present invention comprises a capacitive detector having an output, a switchable magnetic field sensor having an output, a memory unit, and a logic unit. The memory unit stores a standard capacitance change and a standard magnetic field change. The logic unit is electrically connected to the capacitive detector output, the switchable magnetic field sensor, the switchable magnetic field sensor output, and the memory unit. The logic unit of the swipeable computer is adapted to determine if the capacitive detector output corresponds to the standard capacitance change, to enable the switchable magnetic field sensor if the change in capacitance corresponds to the standard capacitance change, and to determine if the switchable magnetic field sensor output corresponds to the standard magnetic field change.