Non-contact Power Feeding Device Coil Segmentation
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Solution Overview
Problem
Existing non-contact power feeding devices experience reduced power reception and increased pulsing motion due to magnetic field interference, leading to instability and increased device size and weight, particularly when power receiving coils straddle power transmission coil boundaries or are separated by large distances.
Innovation Solution
The non-contact power feeding device is configured with power feeding elements and receiving elements spatially separated in the movement direction, where the power receiving elements are always directly facing or opposing power feeding elements, ensuring stable power reception by maintaining optimal positional relationships between the lengths and separation distances of these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power receiving coils are disposed at an interval to prevent pulsing motion, then power feeding stability is improved, but device size increases
Solution Approach 1:
The power transmission system is divided into multiple independent power transmission coils arranged in the movement direction, each capable of independently coupling with power receiving coils. This segmentation allows the system to maintain stable power feeding through proper spacing while keeping individual coil sizes manageable.
Solution Approach 2:
The patent transitions from a single large power transmission coil to multiple smaller coils arranged along the movement direction (adding spatial dimensionality). This dimensional change enables stable power transfer through proper spacing without requiring a single large-volume coil.
2Reliability
If power receiving coils straddle power transmission coil boundaries, then power reception coverage is improved, but magnetic field interference increases
Solution Approach 1:
The patent optimizes the local positional relationship between power transmission coils and power receiving coils, ensuring they are always directly facing or opposing each other rather than straddling boundaries. This local optimization eliminates magnetic field interference while maintaining coverage.
Solution Approach 2:
The patent preemptively prevents magnetic field interference by designing the coil arrangement and movement coordination such that power receiving coils never straddle power transmission coil boundaries. This preliminary anti-action eliminates the harmful effect before it can occur.
3Duration of action of stationary object
If the entire long looped form power transmission coil is charged at all times, then continuous power supply is ensured, but energy loss increases
Solution Approach 1:
The single long looped power transmission coil is divided into multiple separate power transmission coils. This segmentation allows selective activation of only those coils currently needed for power transfer, reducing continuous charging requirements and leakage flux losses.
Solution Approach 2:
Instead of continuously charging the entire power transmission coil system, the patent enables periodic or selective charging of individual power transmission coils based on the position and power needs of the moving body, reducing overall energy loss.
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 configuration ensures continuous and stable non-contact power feeding by minimizing pulsing motion and reducing device size and weight, as at least one power receiving element always faces a power feeding element, allowing for efficient power transfer regardless of the moving body's position.
Implementation Method 1
a power transmission coil has a looped form that is long in a movement direction and crossed in the middle to form multiple units whose magnetic fields are alternately reversed
Implementation Method 2
multiple power receiving coils are disposed at an interval... that receives AC power in a non-contact manner
Data Source
AI summary
A non-contact power feeding device includes multiple power feeding elements that are disposed spatially separated from one another in a movement direction, an AC power supply that supplies AC power to the power feeding elements, multiple power receiving elements that are provided in a moving body and that receive AC power in a non-contact manner, and a power receiving circuit that converts the AC power received by the power receiving elements and that outputs to an electrical load. When a length of the power feeding elements in the movement direction is LT, a separation distance between the power feeding elements is DT, a length of the power receiving elements in the movement direction is LR, and a separation distance between the power receiving elements is DR, the relationship DT≤DR and the relationship (2×LR+DR)≤LT are satisfied.