Wireless Power Supply Frequency Adjustment for Interference Reduction
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Solution Overview
Problem
The existing noncontact wireless power transfer systems face interference from obstacles and external sources generating alternating-current magnetic fields, which can disrupt the detection of a vehicle's approach to a power supply device, leading to inappropriate timing of magnetic field generation and inefficiencies in power supply.
Innovation Solution
A power supply assistance apparatus and system that includes a processor to detect magnetic fields and instruct vehicles to change the frequency of their alternating-current magnetic fields based on the magnetic field around the power supply device, ensuring the position signal frequency differs from the resonant frequency, thereby reducing interference and optimizing power transfer timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If wireless communication is used to detect vehicle approach, then power supply timing can be controlled, but detection accuracy deteriorates due to interference from obstacles and external alternating-current magnetic fields
Solution Approach 1:
The system changes the frequency parameter of the alternating-current magnetic field emitted by the vehicle based on the detected environmental magnetic field conditions. The processor instructs the vehicle to adjust its magnetic field frequency to differ from the resonant frequency of external alternating-current magnetic fields, thereby avoiding interference and improving detection accuracy while maintaining proper power supply timing.
2Device complexity
If the vehicle uses a fixed frequency alternating-current magnetic field as position signal, then communication is simplified, but detection reliability deteriorates when external sources generate alternating-current magnetic fields at the same frequency
Solution Approach 1:
The system transitions from a static fixed-frequency approach to a dynamic frequency adjustment mechanism. The vehicle's alternating-current magnetic field frequency is no longer fixed but is dynamically adjusted based on real-time detection of external magnetic field conditions by the magnetic field detector, ensuring reliable detection even in varying environmental conditions.
Solution Approach 2:
The system implements a feedback loop where the magnetic field detector continuously monitors the environmental magnetic field, and the processor uses this information to instruct the vehicle to adjust its magnetic field frequency. This feedback mechanism ensures that the vehicle's position signal frequency is continuously optimized to avoid interference from external sources.
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 effectively reduces the influence of external magnetic fields on vehicle detection, allowing for accurate and timely generation of alternating-current magnetic fields for power transfer, enhancing the efficiency and reliability of noncontact power supply systems.
Implementation Method 1
acquire an output of a magnetic field detector configured to detect a magnetic field around a power supply device
Implementation Method 2
the power supply device may be configured to supply electric power in a noncontact manner through magnetic resonance coupling
Implementation Method 3
generate an alternating-current magnetic field emitted from the vehicle to the power supply device as a position signal
Data Source
AI summary
A power supply assistance apparatus includes a processor. The processor is configured to acquire an output of a magnetic field detector configured to detect a magnetic field around a power supply device installed in a ground. The processor is configured to instruct a vehicle to change a frequency of an alternating-current magnetic field emitted from the vehicle to the power supply device as a position signal based on the output of the magnetic field detector.