Self-Powered Key Transmits Access Code to Reader
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Solution Overview
Problem
Existing access authorization control systems face challenges in setting a precise range for the electromagnetic interrogation field due to the energetic supply of transponders, leading to disturbances and compromised system size and accuracy.
Innovation Solution
The key generates a self-powered response field with its own energy supply, allowing it to transmit an access authorization code independently of the interrogation field, enabling precise range setting and high query accuracy with a smaller reading module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transponder is fed by the electrical energy of the electromagnetic alternating field, then the transponder can transmit authentication information, but the range of the electromagnetic alternating field can only be adjusted with difficulty and disturbances occur when the transponder cannot draw sufficient energy
Solution Approach 1:
The key is equipped with its own energy supply (battery) that enables it to generate a response field independently, without drawing energy from the interrogation field. This self-service approach allows the key to reliably transmit authentication information while the interrogation field range can be precisely controlled without energy supply constraints.
Solution Approach 2:
The system separates the energy supply function from the interrogation field. The reader module provides only the interrogation field for activation and identification, while the key has its own independent energy supply for generating the response field. This segmentation resolves the contradiction by allowing independent optimization of both field range and communication reliability.
2Device complexity
If a single transmitter and receiver coil is used to generate the alternating electromagnetic field and receive the response field, then the system structure is simplified, but the range setting is problematic and communication disturbances occur
Solution Approach 1:
The system separates the energy supply function from the interrogation field. The reader module provides only the interrogation field for activation and identification, while the key has its own independent energy supply for generating the response field. This segmentation resolves the contradiction by allowing independent optimization of both field range and communication reliability.
Solution Approach 2:
The key is equipped with its own energy supply (battery) that enables it to generate a response field independently, without drawing energy from the interrogation field. This self-service approach allows the key to reliably transmit authentication information while the interrogation field range can be precisely controlled without energy supply constraints.
3Use of energy by moving object
If the transponder draws energy from the electromagnetic field, then wireless power transfer is achieved, but the field strength must be high causing interference and making range adjustment difficult
Solution Approach 1:
The key is equipped with its own energy supply (battery) that enables it to generate a response field independently, without drawing energy from the interrogation field. This self-service approach allows the key to reliably transmit authentication information while the interrogation field range can be precisely controlled without energy supply constraints.
Solution Approach 2:
The energy supply function is extracted from the electromagnetic field and placed into the key itself. The interrogation field is now used only for activation and identification purposes at low strength, while the key's own battery provides the energy needed for response field generation, eliminating the harmful high field strength requirements.
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 ensures reliable and secure access control with improved range precision and reduced interference, enhancing the security and usability of access authorization systems by allowing the key to transmit its own high-frequency response field, thus maintaining system integrity and user convenience.
Implementation Method 1
a low-frequency magnetic field which is generated with the aid of a coil (10)
Implementation Method 2
The response field is a high frequency, electromagnetic field... The response field is generated by this own energy supply
Data Source
AI summary
The device has a reading module (4) that transmits a monitoring field, and a key (18) that receives the monitoring field. The key is adjusted for transmission of access authorization code during reception of the monitoring field. The reading module is adjusted for releasing a device e.g. computer (2), during reception of the access authorization code. The module is adjusted for the transmission of the field between 100 kilo hertz (kHz) and 150 (kHz), and the key has a reception coil (24) that receives the field. An independent claim is also included for a method of controlling access authorization for a computer.