Overlapping Power Reception Coil Layout for Stable Wireless Power
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Solution Overview
Problem
Conventional non-contact power supply devices experience unstable power supply due to magnetic field cancellation between adjacent power transmission coils, leading to increased costs from synchronization control and oversized power transmission circuits to compensate for reduced power capacity.
Innovation Solution
A non-contact power supply device with a power reception coil having overlapping windings and multiple power reception circuits that convert AC power to DC, allowing stable power supply regardless of the moving object's position and output phases of power transmission circuits, eliminating the need for synchronization control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization control is performed to prevent magnetic field cancellation between adjacent power transmission coils, then power supply stability is improved, but device complexity and cost increase
Solution Approach 1:
The power reception coil is divided into multiple independent windings (first power reception coil winding and second power reception coil winding) arranged along the movement direction. Each winding can independently receive power from adjacent power transmission coils, eliminating the need for synchronization control while maintaining stable power supply.
Solution Approach 2:
Adjacent power reception coil windings are disposed to partially overlap each other, creating different effective reception zones along the movement path. This local differentiation ensures that at least one winding is always in an optimal position for power reception, regardless of the moving object's position or the phase of power transmission circuits.
2Reliability
If power transmission circuit capacity is increased to compensate for magnetic field cancellation, then power supply stability is improved, but cost increases
Solution Approach 1:
The power reception coil is segmented into multiple windings that can simultaneously or alternatively receive power from multiple power transmission coils. This segmentation allows the system to utilize the full capacity of smaller power transmission circuits without experiencing power loss from magnetic field cancellation.
Solution Approach 2:
The overlapping arrangement of adjacent power reception coil windings ensures continuous power reception along the movement path. As the moving object travels, different windings sequentially or simultaneously couple with power transmission coils, maintaining uninterrupted power supply without requiring oversized circuits.
3Device complexity
If a single power reception coil winding is used, then device complexity is reduced, but power supply stability deteriorates at boundary positions
Solution Approach 1:
The power reception coil is divided into multiple windings (first and second windings) instead of using a single winding. This segmentation provides redundancy and ensures that power reception is maintained even when the moving object is at boundary positions between power transmission coils, as different windings have different coupling characteristics.
Solution Approach 2:
The power reception coil windings are arranged not only along the movement direction but also with partial overlap in the vertical direction. This multi-dimensional arrangement creates multiple magnetic coupling paths simultaneously, improving power supply stability without significantly increasing structural 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
Ensures stable power supply without decreasing performance at the boundary between power reception coil windings, reducing costs by simplifying the configuration and eliminating the need for synchronization control.
Implementation Method 1
non-contact power supply technologies for transmitting power through magnetic field coupling between two coils spaced from each other
Implementation Method 2
a power reception coil that is provided in a moving object so as to be opposed to power transmission coils provided in a movement path and that has a plurality of power reception coil windings
Data Source
AI summary
A power reception coil of a non-contact power supply device includes a plurality of power reception coil windings arranged along a movement direction of a moving object, and the adjacent power reception coil windings are disposed so as to partially overlap each other. Accordingly, even if a power transmission coil is positioned at a boundary between the power reception coil windings, power supply performance does not decrease. In addition, one power reception coil winding is not opposed to two power transmission coils at a time, and thus a cancellation phenomenon of magnetic fields can be prevented and power can be stably supplied.