Wireless Door Locking System with Mutual Inductance Authentication
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Solution Overview
Problem
Existing door locking systems are vulnerable to unauthorized access through duplicate keys or force, lack real-time intrusion detection, require replacement of mechanical locks, consume significant power, and are susceptible to vandalism and cyber hacking.
Innovation Solution
A wireless locking system comprising an electronic lock installed on a static door frame and an auxiliary resonator on the moving door panel, using mutual inductance for authentication and power transfer, with a processor unit for intrusion detection and remote alerting, and a power management unit for low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical locks are used, then simplicity and ease of operation are maintained, but security against duplicate keys and unauthorized access is compromised
Solution Approach 1:
The locking system is divided into two independent parts: an existing mechanical lock and a new electronic monitoring unit. The electronic unit contains the processor, resonator, and communication components, while the mechanical lock remains unchanged. This segmentation allows security enhancement without complicating the overall system architecture or requiring replacement of proven mechanical components.
Solution Approach 2:
The electronic monitoring unit serves multiple functions: it authenticates electronic keys via resonator communication, monitors door open/close status, detects unauthorized access attempts, and communicates with remote devices. This multi-functionality consolidates security, monitoring, and communication capabilities into a single unit that works with existing mechanical locks.
2Ease of operation
If smart-locks with remote operation are implemented, then remote access control is enabled, but power consumption increases significantly
Solution Approach 1:
The electronic monitoring unit operates in periodic cycles rather than continuously. The processor wakes up at intervals to check for authentication requests, monitor door status, and communicate with remote devices. This periodic operation dramatically reduces average power consumption compared to continuous operation while maintaining remote access control functionality.
Solution Approach 2:
The auxiliary resonator wirelessly transfers power and authentication data to the electronic key without requiring the key to have its own power source. The electronic key harvests energy from the resonator's electromagnetic field, eliminating the need for batteries in the key and reducing overall system power requirements.
3Ease of operation
If electronic components are exposed on the outside of the door, then user interaction is simplified, but vulnerability to vandalism and cyber hacking increases
Solution Approach 1:
The electronic monitoring unit is installed inside the door or door frame, nested within the existing door structure. The mechanical lock remains on the outside as before, while all sensitive electronic components (processor, resonator, communication modules) are protected inside the door. This nesting arrangement protects electronics from vandalism while maintaining system functionality.
Solution Approach 2:
The auxiliary resonator acts as an intermediary that wirelessly transmits authentication data and power through the door material from the outside to the inside. This allows user interaction without exposing electronic components, as the resonator communicates through the door barrier rather than requiring external exposure of sensitive electronics.
4Ease of operation
If mechanical locks are replaced with smart-locks, then remote operation is enabled, but installation complexity and cost increase
Solution Approach 1:
The system is segmented into existing mechanical lock components and a separate electronic monitoring unit. This allows the proven mechanical lock to remain in place while adding electronic functionality through a separate unit that interfaces with the mechanical lock's existing structure. This segmentation avoids the complexity of designing and installing entirely new smart-lock mechanisms.
Solution Approach 2:
Instead of replacing the mechanical lock with a smart-lock, the invention inverts the approach by keeping the mechanical lock and adding an electronic monitoring unit that works with it. This reversal of the conventional smart-lock installation approach simplifies manufacturing and installation while achieving the same remote operation capability.
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
Enables secure, real-time awareness of unauthorized access, operates without replacing existing locks, reduces power consumption, and is resistant to vandalism and cyber threats, while providing remote intrusion alerts.
Implementation Method 1
using mutual inductance for authentication and power transfer
Data Source
AI summary
A system according to an embodiment includes electronic lock and key of which the electronic lock can be installed on a portal such as a door. The electronic lock is capable of contact-less authentication of the electronic key carried in person by a user, and also determines the open/close condition of the door panel with respect to the door frame. Being an add-on, there is no need to replace or modify the existing mechanical lock at the door. The electronic key does not require any batteries to operate, being powered by the electronic lock through wireless transfer of power through the door panel. After a successful authentication of the electronic key, the electronic lock clears the user to open the door. An attempted illegal entry by force or using duplicate key of the mechanical lock without electronic authentication is considered intrusion. Once an intrusion is detected, the system generates an alarm at the premises as well informs multiple mobile devices (e.g., cell phone) anywhere in the world through a wireless network. The electronic lock can be powered by a battery or AC source depending on the installation scenario.