Wireless Charger Sniffer System Preventing Keyless Entry Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless charging systems in vehicles equipped with Keyless Entry systems experience interference due to overlapping frequency bands, causing communication failures between the vehicle control module and the key, which can prevent the vehicle from starting or operating properly.
Innovation Solution
A wireless charging system with a sniffer system that detects low-frequency signals from the Keyless Entry system, deactivating the coil for a predetermined duration when such signals are detected to prevent interference, ensuring that charging operations do not interfere with Keyless Entry communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless charging coil operates continuously, then charging efficiency is improved, but interference with Keyless Entry communication occurs
Solution Approach 1:
The wireless charging system operates in periodic cycles, alternating between charging phases and detection phases. During each cycle, the coil is activated for charging, then deactivated for a predetermined duration to allow LF signal detection. This periodic on-off operation enables the system to maintain charging efficiency over time while periodically eliminating interference with Keyless Entry communications.
Solution Approach 2:
The sniffer system continuously monitors for LF signals and provides feedback to the charging control system. When an LF signal is detected, indicating active Keyless Entry communication, the feedback triggers the coil to deactivate. This closed-loop feedback mechanism dynamically adjusts charging operation based on real-time communication status, preventing interference while maintaining overall charging efficiency.
2Reliability
If the coil is deactivated to detect LF signals, then communication interference is prevented, but charging continuity is reduced
Solution Approach 1:
The system applies partial deactivation of the coil only for the minimum necessary duration required to detect LF signals and prevent interference. Rather than completely stopping charging operations, the coil is deactivated only during brief predetermined time intervals when communication detection is needed, maintaining charging continuity to the greatest extent possible while ensuring communication reliability.
Solution Approach 2:
The system performs preliminary detection of LF signals before charging interference occurs. By continuously monitoring for communication signals and proactively deactivating the coil when signals are detected or anticipated, the system prevents interference before it can disrupt charging, thereby maintaining both communication reliability and charging duration.
3Reliability
If a sniffer system is added to detect LF signals, then communication interference is prevented, but device complexity increases
Solution Approach 1:
The sniffer system is designed to perform multiple functions: detecting LF signals from Keyless Entry systems, determining communication status, and triggering charging deactivation. By consolidating these related functions into a single integrated detection system rather than separate components, the patent reduces overall system complexity while maintaining communication reliability.
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 effectively inhibits wireless charging during Keyless Entry communications, preventing interference and ensuring reliable vehicle operation by muting the charging system when LF signals are detected, thereby maintaining communication integrity.
Implementation Method 1
Wireless chargers use inductive charging mechanisms. Inductive charging uses an electromagnetic field to transfer energy between a power source and a device to be charged.
Implementation Method 2
a sniffer system to detect a presence of a low frequency (LF) signal
Data Source
AI summary
A wireless charging system is disclosed. The wireless charging system includes a coil to create electromagnetic field and a sniffer system to detect a presence of a low frequency (LF) signal. The sniffer system is configured to deactivate the coil for a predetermined duration and perform an operation to detect the presence of the LF signal.