Wireless Proximity Detection Using Pulsed Antenna Impedance Sensing
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Solution Overview
Problem
Existing wireless proximity detection systems for mobile electronic devices face challenges in reducing power consumption while maintaining precise and reliable proximity detection and motion detection.
Innovation Solution
A wireless proximity detector arrangement that includes at least one antenna, an impedance sensing circuit, and a controller. The impedance sensing circuit measures variations in antenna impedance over time, and the controller selectively activates and deactivates the circuit in a pulsed mode to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the impedance sensing circuit operates continuously to maintain precise proximity detection, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The impedance sensing circuit is operated in a pulsed manner with periodic activation and deactivation. The controller activates the sensing circuit at predetermined time intervals to perform proximity detection, then deactivates it to conserve power. This periodic operation maintains adequate detection precision while significantly reducing overall power consumption compared to continuous operation.
2Use of energy by moving object
If the impedance sensing circuit is deactivated to reduce power consumption, then energy efficiency is improved, but detection reliability deteriorates
Solution Approach 1:
The sensing circuit is deactivated during periods when proximity detection is not required, reducing energy consumption. The controller selectively activates the sensing circuit only when proximity detection is needed, such as during specific operational states or at predetermined time intervals, thereby maintaining detection reliability while improving energy efficiency.
Solution Approach 2:
The operational state of the impedance sensing circuit is dynamically adjusted based on system requirements. The controller adapts the activation and deactivation timing of the sensing circuit according to the current operational context, optimizing the balance between detection reliability and energy efficiency in real-time.
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 reduces the overall energy consumption of the impedance sensing circuit and extends battery life in mobile devices by optimizing the activation and deactivation of the impedance sensing circuit, while maintaining accurate proximity and motion detection.
Implementation Method 1
an impedance sensing circuit (14) coupled to the antenna (12) and operable to quantitatively measure variations of an antenna impedance over time
Data Source
AI summary
A wireless proximity detector arrangement includes at least one antenna, an impedance sensing circuit coupled to the antenna and operable to quantitatively measure variations of an antenna impedance over time, and a controller connected to the impedance sensing circuit and operable to at least one of selectively deactivating and selectively activating the impedance sensing circuit for a predefined time interval.