Stacked Coil Unit for Contactless Power and Data Transmission
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Solution Overview
Problem
Existing contactless power transmission systems require additional coil pairs for both power transmission and communication, increasing the two-dimensional occupancy space and potentially interfering with each other's magnetic flux, which complicates efficient power and data transfer.
Innovation Solution
The use of a coil unit with a first coil for power transmission and a second coil for communication, where the second coil is stacked and laminated on the transmission surface of the first coil, maintaining the area occupancy and minimizing electromagnetic coupling by ensuring the high magnetic flux density areas do not overlap, allowing for independent use without increasing space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate coil pairs are provided for power transmission and communication, then both functions can be performed independently, but the two-dimensional occupancy space increases and device complexity increases
Solution Approach 1:
The patent combines the power transmission coil and communication coil into a single integrated coil structure. The coil unit has a first coil for power transmission and a second coil for communication, where the second coil is arranged to overlap the first coil when viewed from the transmission surface side. This merging approach allows both power transmission and communication functions to be performed using the same physical space, reducing the two-dimensional occupancy area while maintaining independent functionality through electromagnetic coupling control.
Solution Approach 2:
The patent transitions from a planar arrangement of separate coils to a three-dimensional stacked configuration. The second coil is positioned on the transmission surface side of the first coil, creating vertical layering. This dimensional change allows both coils to occupy the same two-dimensional footprint while being separated in the third dimension (thickness direction), thereby reducing the required surface area while maintaining functional independence.
2Reliability
If separate coil pairs are provided for power transmission and communication, then both functions can be performed independently, but device complexity increases
Solution Approach 1:
The patent merges multiple coil functions into a single integrated coil unit. Instead of providing separate coil pairs for power transmission and communication, the invention uses one first coil and one second coil within the same coil unit, reducing the total number of coils while maintaining independent functionality through controlled electromagnetic coupling.
Solution Approach 2:
The coil unit is designed to perform multiple functions simultaneously. The first coil handles power transmission while the second coil handles communication, but both coils are integrated within the same structural unit and can be controlled to work independently or together, providing universal functionality with reduced component count.
3Area of stationary object
If multiple coils are arranged in the same area, then space occupancy is reduced, but magnetic flux interference increases
Solution Approach 1:
The patent applies different spatial positioning strategies to different coils within the same unit. The second coil is specifically arranged to overlap the first coil when viewed from the transmission surface side, but is positioned on the transmission surface side to create directional separation. This local quality differentiation allows both coils to share the same footprint while minimizing magnetic flux interference through strategic positioning.
Solution Approach 2:
The patent uses vertical layering to separate the magnetic flux paths of the two coils. By positioning the second coil on the transmission surface side of the first coil in the thickness direction, the invention creates distinct three-dimensional spaces for each coil's magnetic field, reducing mutual interference while maintaining the same two-dimensional occupancy area.
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 enables efficient contactless power transmission and communication without increasing the occupied area, while reducing mutual interference between the coils, thus optimizing the use of space and maintaining transmission functions.
Implementation Method 1
contactless power transmission (non-contact power transmission) that utilizes electromagnetic induction to enable power transmission without metal-to-metal contact
Data Source
AI summary
A coil unit includes a first coil having an outer diameter of D1, and at least one second coil having an outer diameter of D2 (D2<D1). The at least one second coil is arranged on a transmission surface side of the first coil. A part or whole of the at least one second coil overlaps the first coil, when viewed from the transmission surface side.