Inductive Power Transfer for Secure Door Communication
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Solution Overview
Problem
Existing access control systems for buildings face challenges in powering and securely transmitting information to door locking systems, with wireless solutions relying on batteries and being susceptible to interception, and wired solutions being costly and prone to maintenance issues due to fatigue from repeated door openings and closings.
Innovation Solution
An inductive power transfer system is integrated with magnetic lock systems to transmit both power and data, using a modulated inductive power transfer signal to encode and decode information, eliminating the need for wired connections and providing a secure, battery-free solution for door control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless Bluetooth transmissions are used to power and communicate with door locking systems, then wireless operation is achieved, but batteries are required which need periodic replacement and security is compromised due to broadcast susceptibility
Solution Approach 1:
The patent combines power transmission and data communication into a single inductive power transfer system. The door control module integrates both the inductive power receiver and communication functions, eliminating the need for separate battery power and wireless communication hardware. This merging resolves the contradiction by providing wireless operation without batteries while maintaining security through non-broadcast communication over the power transfer channel.
Solution Approach 2:
The inductive power transfer system serves multiple functions simultaneously: it provides power to the door locking system and transmits communication data. The modulated inductive power transfer signal carries both power and encoded information, making the system universal in its capability to handle both energy and data transmission through a single channel, thereby eliminating the need for batteries and separate communication interfaces.
2Reliability
If physical cabling is run to the door for power and data transmission, then reliable power and communication are achieved, but installation cost increases and maintenance becomes difficult due to wiring fatigue from repeated door openings
Solution Approach 1:
The patent replaces the mechanical wiring system with an electromagnetic field-based inductive power transfer system. Instead of running physical cables through the door and frame, the system uses magnetic coupling between a transmitter in the frame and a receiver in the door. This substitution eliminates the mechanical wear and fatigue issues associated with repeated door movements while maintaining reliable power and data transmission through the wireless electromagnetic channel.
Solution Approach 2:
The inductive power transfer system acts as an intermediary between the power source and the door locking system. Rather than directly connecting power and data lines through physical cables that must pass through moving parts, the system uses the electromagnetic field as an intermediary medium to transmit both energy and information across the air gap between the stationary frame and the moving door, eliminating mechanical wear points.
3Use of energy by moving object
If wired connections are used for door control systems, then stable power supply is achieved, but installation complexity and cost increase due to running wiring through doorframes and doors
Solution Approach 1:
The patent replaces the complex mechanical wiring infrastructure with a wireless inductive power transfer system. The electromagnetic coupling between the frame-mounted transmitter and door-mounted receiver eliminates the need to drill holes, run cables through doorframes and doors, and connect multiple wires. This substitution maintains stable power supply through the inductive link while dramatically reducing installation complexity and cost.
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 enables secure, wireless communication and power transmission to door components without the need for wired connections, reducing maintenance and installation costs while ensuring reliable operation and data security.
Implementation Method 1
An inductive power transfer system is integrated with magnetic lock systems to transmit both power and data
Implementation Method 2
using a modulated inductive power transfer signal to encode and decode information
Data Source
AI summary
A system and method for a door system is disclosed. The system produces an inductive power transfer signal and modulates the inductive power transfer signal. The system also encodes data within the modulated inductive power transfer signal and transmits the signal at a door frame of a door. At the door, the system receives the modulated inductive power transfer signal and extracts data from the received signal, and transduces the received signal into a door power signal. The system also supports secure data transfer by encrypting the encoded data at the door frame and decrypting the extracted data at the door. As a result, the modulated inductive power transfer signal between the door frame and the door provides a secure wireless data transfer channel for configuring components at the door and/or displaying data at the door, while also providing power to components at the door.