Wireless Charging Controller Timing for In-Vehicle Communication
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Solution Overview
Problem
Existing wireless charging systems face challenges in stopping power transmission at the right time to avoid interfering with in-vehicle wireless communication systems, particularly when communication between an electronic key and a vehicle's wireless communication device is initiated, leading to potential electromagnetic interference.
Innovation Solution
A wireless charging system with a controller that stops power transmission based on predetermined signals from in-vehicle equipment, such as door switches or the wireless communication device itself, ensuring that power transmission is halted before communication begins, thereby reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power transmission is stopped only after detecting communication signals, then communication interference is reduced, but electromagnetic waves cannot be lowered to predetermined levels before actual communication starts
Solution Approach 1:
The system performs preliminary detection of communication signals using the antenna before stopping power transmission. By detecting communication signals in advance and stopping power transmission based on this early detection, the system ensures electromagnetic waves are lowered to predetermined levels before actual communication begins, resolving the timing contradiction between early stopping and interference reduction
2Object-affected harmful factors
If power transmission is stopped early based on predetermined signals, then electromagnetic interference is reduced, but communication may be affected if stopping timing is not precise
Solution Approach 1:
The system continuously monitors communication signals and provides feedback to the power transmission control. By detecting communication signals in real-time and adjusting power transmission accordingly, the system ensures precise stopping timing that protects both communication reliability and reduces electromagnetic interference
3Adaptability or versatility
If the antenna is driven for communication, then wireless communication function is enabled, but electromagnetic waves from primary coil may interfere with communication
Solution Approach 1:
The system applies preliminary anti-action by stopping power transmission in advance when communication is detected or about to occur. This preemptive measure counteracts the potential electromagnetic interference from the primary coil before it can affect the communication function, allowing both wireless charging and communication to operate reliably
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 allows for earlier and more precise stopping of power transmission, minimizing the impact on in-vehicle wireless communication systems, even during vehicle operation or key presence detection, thus reducing the likelihood of interference and preventing erroneous alarms.
Implementation Method 1
a portable terminal such as a smartphone is placed on a charger having a primary coil built-in, to thereby charge a battery of the portable terminal through a secondary coil of the portable terminal
Implementation Method 2
an in-vehicle wireless communication device having an antenna configured to perform wireless communication with an electronic key
Data Source
AI summary
A wireless charging system includes a wireless charger includes a power transmission part and a controller, the power transmission part being configured to transmit power to a portable terminal having a power-receiving part in a non-contact manner, the controller being configured to control power transmission performed by the power transmission part and to control a stop of the power transmission; and an in-vehicle wireless communication device having an antenna configured to perform wireless communication with an electronic key of an occupant of the vehicle, wherein the wireless charger is communicably connected to predetermined equipment which is provided to the vehicle, and when wireless communication between the in-vehicle wireless communication device and the electronic key is performed, the controller stops power transmission performed by the power transmission part in a case where a predetermined signal which is transmitted from the predetermined equipment is received before the antenna is driven.