RFID Pet Door Reader Power Optimization via Dynamic Mode Switching
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Solution Overview
Problem
RFID pet doors face challenges in efficiently reading a wide range of transponders with different frequencies, modulation schemes, and power consumption issues due to varying transponder types and standards, leading to short battery life and reduced range.
Innovation Solution
An RFID reader that operates in two modes: learn mode to store ID codes and additional reader information for various transponder types, and normal mode to optimize power usage by selecting appropriate frequencies and modulation schemes based on stored data, reducing power consumption while maintaining reliable read range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the reader field amplitude is raised to high levels to achieve adequate read range for all transponders, then the read range is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the reader field amplitude based on the detected transponder type. The system first performs a detection phase to identify the transponder's frequency and modulation scheme, then switches to an operation phase where the reader field amplitude is optimized for that specific transponder type. This dynamic adaptation allows the system to achieve adequate read range for each transponder without consistently maintaining high power levels.
Solution Approach 2:
The system changes operational parameters (frequency, modulation scheme, and field amplitude) based on the detected transponder characteristics. By detecting the transponder type first and then adjusting the reader field parameters accordingly, the system avoids the need to maintain high power levels for all transponder types, thus reducing overall power consumption while maintaining adequate read range.
2Adaptability or versatility
If multiple frequencies and modulation schemes are tested to work with a wide population of transponders, then the adaptability is improved, but the power consumption increases
Solution Approach 1:
The patent divides the operation into two distinct phases: a detection phase where multiple frequencies and modulation schemes are tested to identify the transponder type, and an operation phase where only the identified parameters are used. This segmentation allows the system to maintain high adaptability during detection while consuming minimal power during normal operation, as full-spectrum testing is performed only when needed.
Solution Approach 2:
The system performs preliminary detection to identify the transponder's frequency and modulation scheme before proceeding with normal operation. This preliminary action enables the system to avoid repeatedly testing all possible frequencies and modulation schemes during each access attempt, thereby reducing power consumption while maintaining compatibility with diverse transponder types.
3Reliability
If the reader continuously tests all transponder types to ensure compatibility, then the reliability is improved, but the productivity decreases
Solution Approach 1:
The system dynamically adapts its testing strategy based on the detected transponder type. After initial detection and identification of the transponder's characteristics, the system switches to a streamlined operation mode that uses only the identified parameters, eliminating the need for continuous comprehensive testing. This dynamic approach ensures reliable access while significantly improving access speed for subsequent operations.
Solution Approach 2:
The system performs self-identification of the transponder type through automatic detection, eliminating the need for manual configuration or continuous verification. Once the transponder type is identified, the system automatically adjusts its operation parameters, enabling both high reliability and fast access without requiring ongoing comprehensive testing of all transponder types.
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 extends the battery life of RFID pet doors by reducing average power required for reading RFID transponders and increasing the reliable read range for a given power input, accommodating a diverse population of transponders with improved efficiency.
Implementation Method 1
A method of operating an RFID system comprises determining a frequency of a reader field to be generated by an RFID reader, the frequency being one of a set of possible frequencies, generating the reader field at the determined frequency, thereby inducing current in an RFID transponder
Data Source
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AI summary
Embodiments of the invention relate to the field of RFID readers, particularly RFID readers used in pet doors to control access for a pet bearing an RFID tag or implant. We describe an RFID reader that incorporates two modes, a learn mode and a normal mode. In learn mode the reader stores the ID code of an RFID transponder in the vicinity of the reader and also derives additional reader information corresponding to the RFID transponder. In normal mode the reader compares the ID codes stored in memory to the RFID signal returned from an RFID transponder in the vicinity of said the reader. The RFID reader behaviour is at least in part determined by the additional reader information corresponding to said ID codes stored in memory. We also describe a confidence threshold for acceptance of an ID code in learn mode and normal mode. The confidence threshold in normal mode may be less than in learn mode.