Wireless Power Reception Apparatus with Positional Alignment Control
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Solution Overview
Problem
Existing wireless power transmission systems face efficiency drops due to positional misalignment between power transmission and reception units, particularly in vehicles, where precise alignment is difficult and electromagnetic induction methods require close contact, limiting the distance and tolerance for misalignment.
Innovation Solution
A wireless power transmission and reception system utilizing magnetic resonance technology with a control unit that adjusts the positional alignment and parameters of the power transmission and reception units to maintain high efficiency even with moderate misalignment, employing a positional alignment mechanism and impedance adjustment to optimize power transfer through a magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electromagnetic induction technique is used for wireless power transmission, then power can be transmitted wirelessly, but transmission distance is limited and positional alignment requirement is strict
Solution Approach 1:
The patent changes the fundamental parameter of power transmission from electromagnetic induction to magnetic resonance coupling. This parameter change enables power transmission over longer distances and with greater positional misalignment tolerance, as magnetic resonance can maintain coupling effectiveness over larger gaps compared to electromagnetic induction which requires close proximity
2Length of moving object
If magnetic resonance technique is used for wireless power transmission, then transmission distance is extended, but positional alignment becomes more critical for efficiency
Solution Approach 1:
The patent introduces a movable primary coil apparatus that can dynamically adjust its position within a recess. This dynamic adjustment capability allows the system to compensate for positional misalignment between the vehicle and charging infrastructure, maintaining reliable power transfer efficiency even when initial positioning is imperfect
Solution Approach 2:
The system incorporates feedback mechanisms to monitor power transfer efficiency and adjust the position of the primary coil accordingly. By detecting changes in coupling conditions and responding with positional adjustments, the system maintains optimal efficiency despite variations in vehicle positioning
3Reliability
If strict positional alignment is required for power transmission, then power reception efficiency is maximized, but ease of operation decreases
Solution Approach 1:
The patent designs the primary coil apparatus with built-in positional tolerance through its movable support structure and recess configuration. This beforehand cushioning allows for a range of acceptable positions, preventing the system from failing due to minor alignment errors and making operation easier for users
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
The system ensures high power reception efficiency without extreme decreases, even with positional misalignment, by switching between characteristics that accommodate wider and narrower misalignment ranges, effectively transmitting power over larger distances and varying misalignment conditions.
Implementation Method 1
energy transfer by means of the magnetic resonance technique has been of interest as a technique that enables electrical energy to be transferred wirelessly
Implementation Method 2
a charging system includes a coil moving apparatus which movably supports an electromagnetic-induction primary coil
Data Source
AI summary
A power transmission apparatus includes a power transmission unit and a power supply unit. A wireless power reception apparatus includes a power reception unit capable of wirelessly receiving electric power from the power transmission unit, and a control unit performing control for positional alignment between the power reception unit and the power transmission unit and for reception of electric power after the positional alignment. The magnitude of electric power received by the power reception unit from the power transmission unit is used for positional alignment between the power reception unit and the power transmission unit. The control unit sets a parameter of a power transmission and reception path so that a power receivable range that can be received by the power reception unit at any time while positional alignment is done is wider than that when electric power is received after the positional alignment.