Vehicle Wireless Power System Frequency Segmentation
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Solution Overview
Problem
Existing methods for charging vehicle batteries and supplying power to in-vehicle devices in a non-contact manner are inefficient, as they often interfere with each other and do not effectively consider the characteristics of both power transmission and reception methods, leading to potential device damage and alignment challenges.
Innovation Solution
A vehicle system utilizing electromagnetic field resonance for non-contact power reception and transmission, where the frequency for power reception is set to be different from the frequency for power transmission, with a power reception device and a power transmission device using separate electromagnetic fields to receive and transmit power independently, and a control unit managing the vehicle's operational state to permit or prohibit charging and power supply based on occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electromagnetic field resonance is used for both power reception and power transmission to in-vehicle devices, then non-contact power supply is achieved, but interference occurs between the two functions affecting device reliability
Solution Approach 1:
The patent divides the electromagnetic field resonance system into two separate frequency channels: one for power reception (e.g., 6.78 MHz) and another for power transmission to in-vehicle devices (e.g., 27.12 MHz). This segmentation allows both functions to operate simultaneously without interference, resolving the contradiction between ease of non-contact operation and device reliability.
Solution Approach 2:
The patent changes the frequency parameter of the electromagnetic field resonance system to resolve interference. By operating power reception and power transmission at different frequencies, the system maintains non-contact convenience while preventing mutual interference that would compromise device reliability.
2Productivity
If high power is transmitted for vehicle battery charging, then charging efficiency is improved, but low-output in-vehicle electric devices may be damaged
Solution Approach 1:
The patent segments the power transmission system into two independent channels with different power levels: a high-power channel for vehicle battery charging and a low-power channel for in-vehicle electric devices. This segmentation enables high charging efficiency while protecting sensitive devices from damage through controlled power delivery.
Solution Approach 2:
The patent changes the power parameter by frequency: high power is delivered at the power reception frequency for efficient battery charging, while low power is delivered at the power transmission frequency to protect in-vehicle devices. This parameter differentiation resolves the contradiction between charging efficiency and device safety.
3Reliability
If separate frequencies are used for power reception and transmission, then interference is eliminated, but system complexity increases
Solution Approach 1:
The patent applies multi-functionality to the electromagnetic resonance system, where a single resonant circuit structure serves dual purposes: power reception from external sources and power transmission to in-vehicle devices. By using the same hardware platform at different frequencies, the system eliminates interference while minimizing the increase in complexity through universal component usage.
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 efficient non-contact power reception for vehicle operation and transmission to in-vehicle devices without interfering with each other, allowing for safe and convenient charging and power supply while maintaining vehicle functionality.
Implementation Method 1
a power reception device that receives power for running the vehicle in a non-contact manner using electromagnetic field resonance
Implementation Method 2
a power transmission device that transmits power supplied to an electric device inside the vehicle in a non-contact manner using the electromagnetic field resonance
Data Source
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Figure 5
AI summary
A vehicle includes: a power reception device (110) that receives power for running the vehicle (100) in a non-contact manner using electromagnetic field resonance; and a power transmission device (184) that transmits power supplied to an electric device inside the vehicle in a non-contact manner using the electromagnetic field resonance. A frequency of an electromagnetic field used by the power reception device to receive power is set to be different from a frequency of an electromagnetic field used by the power transmission device to transmit power. It is desirable to set the frequency of the electromagnetic field used by the power reception device to receive power and the frequency of the electromagnetic field used by the power transmission device to transmit power such that the frequency of the electromagnetic field used by the power reception device to receive power is lower than the frequency of the electromagnetic field used by the power transmission device to transmit power. It is even more desirable for the power received by the power reception device in a non-contact manner from an external power transmission device provided outside the vehicle to be larger than the power transmitted by the power transmission device to the electric device in a non-contact manner.