Vehicle Wireless Power Transmission Interference Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Contactless charging systems for vehicles may interfere with on-vehicle radio receivers during frequency search operations due to electromagnetic waves emitted during power transmission, potentially stopping the search for broadcasting stations.
Innovation Solution
An electric power transmission apparatus for vehicles that includes a receiver capable of shifting its reception frequency, an interrupting device to pause power transmission during frequency searches, and a frequency changing device that adjusts the transmission frequency to minimize interference by changing it when the multiplied wave frequency is close to the current reception frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If contactless electric power transmission is performed using electromagnetic waves, then electric power can be transmitted to the mobile device, but electromagnetic waves may interfere with the radio wave receiver's search operation
Solution Approach 1:
The system periodically checks whether the radio wave receiver is performing a search operation and interrupts electric power transmission during these periods. This periodic monitoring and interrupting action prevents electromagnetic wave interference while maintaining power transmission capability during non-search periods
Solution Approach 2:
The control device determines in advance whether the receiver is executing a search operation before initiating or continuing electric power transmission. By checking the search operation status beforehand, the system can prevent interference proactively rather than reactively
2Object-affected harmful factors
If the transmission frequency is changed to avoid interference with the receiver, then electromagnetic wave interference is reduced, but the power transmission efficiency may be affected
Solution Approach 1:
The system changes the transmission frequency parameter when interference is detected or predicted. By adjusting the frequency away from the receiver's operating frequency, the system eliminates interference while maintaining effective power transmission at the new frequency
3Reliability
If the receiver continuously monitors for search operations to prevent interference, then radio wave reception reliability is improved, but device complexity increases
Solution Approach 1:
The control device performs multiple functions: it manages electric power transmission, monitors receiver operation status, determines search operation states, and controls frequency adjustment. By consolidating these functions in a single control device, the system achieves reliable radio wave reception without proportionally increasing overall device complexity
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
Prevents electromagnetic wave interference with radio wave search operations, ensuring the functionality and usability of the receiver by interrupting power transmission during searches and adjusting frequencies to reduce electromagnetic wave influence on the receiver.
Implementation Method 1
an electric power transmission device that transmits an electromagnetic wave of a predetermined transmission frequency to the mobile device to thereby transmit electric power to the electric power receiving device of the mobile device
Implementation Method 2
a receiver that is capable of receiving a radio wave of a predetermined frequency transmitted from outside of the vehicle
Data Source
AI summary
An electric power transmission apparatus for a vehicle includes: a radio receiver that is capable of receiving a radio wave of a predetermined frequency transmitted from outside of the vehicle, and that is capable of executing a search operation of searching for the radio wave by shifting reception frequency from a current reception frequency at a predetermined shift speed, and stopping shifting of the reception frequency when a radio wave is received at or above a predetermined receiving intensity; and an on-vehicle device that interrupts transmission of the electric power to a mobile device performed by an electric power transmitter while the radio receiver is executing the search operation.