Single Inductor Direction Detection Asymmetric Waveform
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Solution Overview
Problem
Existing shopping cart containment systems require multiple cables and complex installations to determine the direction of cart movement across a boundary, increasing costs and complexity, while current single inductor solutions struggle with reliable direction detection and power efficiency.
Innovation Solution
A single inductor system is used to detect the direction of cart movement by measuring a single component of the vector magnetic field generated by a buried cable, employing asymmetric waveforms and advanced receiver circuits to differentiate between entering and exiting cart movements, reducing the need for additional cables and components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cables and multi-inductor systems are used to detect cart movement direction, then direction detection reliability is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent employs asymmetric waveforms transmitted through the buried cable to enable direction detection using a single inductor. The asymmetric nature of the waveform allows the receiver to distinguish between carts approaching from opposite directions by detecting the unique signal characteristics, eliminating the need for multiple symmetric sensor arrangements while maintaining reliable direction detection.
Solution Approach 2:
The system changes the parameter of the electromagnetic signal by using asymmetric waveforms with specific frequency characteristics. This parameter change enables the single inductor to extract directional information from the signal asymmetry, resolving the contradiction between using fewer sensors and maintaining detection reliability.
2Measurement precision
If multiple cables are installed to determine cart movement direction, then direction detection accuracy is improved, but installation complexity and cost increase
Solution Approach 1:
The patent extracts the directional detection capability from the physical cable configuration and embeds it in the electromagnetic signal characteristics instead. By taking out the need for multiple cables and encoding direction information in the waveform asymmetry, the system achieves accurate direction detection with a single cable installation, significantly simplifying the installation process.
3Reliability
If traditional multi-component systems are used for direction detection, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple detection functions into a single inductor-based receiver that processes asymmetric waveforms. By combining the directional detection capabilities that would traditionally require multiple sensors into one integrated component, the system maintains reliable detection while significantly reducing power consumption associated with multiple active components.
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 enables efficient and cost-effective direction detection of cart movement, reducing power consumption and installation complexity while maintaining reliable anti-theft functionality, allowing for accurate activation or release of motion inhibition mechanisms.
Implementation Method 1
measuring a single component of the vector magnetic field generated by a buried cable
Implementation Method 2
A single inductor system is used to detect the direction of cart movement by measuring a single component of the vector magnetic field generated by a buried cable
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
A containment area can be defined by a single cable carrying an asymmetric electromagnetic signal that generates a magnetic field comprising an asymmetric waveform. A single inductor circuit configured to detect a single axis of the magnetic field can detect the asymmetric waveform and determine which direction the inductor is traveling relative to the cable. A human-propelled cart can have a wheel that includes the single inductor circuit and detect whether the cart is being pushed from inside-to-outside the containment area (which may reflect the cart is being stolen or improperly used) or from outside-to-inside (which may reflect the cart is being returned). The cart can include an anti-theft system (e.g., a locking or braking wheel), which can be triggered if the cart is being moved from inside to outside the containment area. The single cable, single inductor system can be less expensive and more efficient than multi-cable, multi-inductor systems.