Vehicle Wireless Charging Frequency Control to Avoid Smart Key Interference
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Solution Overview
Problem
Existing wireless power transmission systems for vehicles face interference issues with electronic devices, such as smart keys, due to shared frequency bands, leading to potential system malfunctions and safety hazards.
Innovation Solution
A wireless power transmission device for vehicles that operates on a frequency band lower than the vehicle's control frequency, allowing for detection and power transmission while avoiding interference, by adjusting the operation frequency and voltage based on power control signals received from the wireless power reception device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a magnetic induced type wireless power transmission system operates at 100 KHz to achieve wireless charging, then wireless power transmission is enabled, but frequency interference occurs with vehicle electronic devices operating at similar frequencies (e.g., smart key at 125 KHz)
Solution Approach 1:
The patent changes the operating frequency parameter from the conventional 100 KHz to a higher frequency range of 200 KHz to 1000 KHz. This parameter change allows the wireless power transmission system to operate in a frequency band that does not interfere with vehicle electronic devices, thereby resolving the frequency interference problem while maintaining wireless power transmission capability
Solution Approach 2:
The patent introduces a frequency selection dimension by providing multiple frequency bands (200-1000 KHz) and selecting an appropriate frequency based on the vehicle's electronic device operating frequencies. This dimensional approach allows the system to avoid interference by choosing a frequency that is orthogonal to the interference-prone frequencies
2Reliability
If the wireless power transmission device uses a frequency band lower than the vehicle control frequency to avoid interference, then frequency compatibility is improved, but the power transmission efficiency may be affected
Solution Approach 1:
The patent implements dynamic frequency selection where the controller can adjust the operating frequency within the 200-1000 KHz range based on the detected vehicle electronic device frequencies and power transmission requirements. This dynamic adjustment allows the system to optimize both interference avoidance and power transmission efficiency under different operating conditions
Solution Approach 2:
The patent incorporates a feedback mechanism where the controller monitors the operating environment, detects frequency interference, and adjusts the transmission frequency accordingly. This feedback loop ensures that the system maintains optimal power transmission efficiency while avoiding frequency interference with vehicle electronic devices
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 safe and compatible wireless charging of vehicles without interfering with existing electronic devices, ensuring reliable operation and preventing potential accidents.
Implementation Method 1
a non-contact charging method of charging wireless power induced by a magnetic field generated in a primary coil of a wireless power transmission device
Data Source
AI summary
A wireless power transmission device for a vehicle and a method are provided. The wireless power transmission device for a vehicle may transmit a signal for detection of a wireless power reception device by using a lower frequency band that is different from an operating frequency band used to control the vehicle. The wireless power transmission device may receive a response signal for the transmitted signal and a power control signal from the wireless power reception device. The wireless power transmission device may control an operating frequency or a voltage (or both) in the wireless power transmission device for the vehicle according to the power control signal. The wireless power transmission device may transmit wireless power to the wireless power reception device.