Wireless Power Transfer Pad Wiring Layout for EM Field Cancellation
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in managing harmful electromagnetic field radiation emissions while maintaining easy access to electronics for maintenance, often requiring significant shielding that compromises accessibility.
Innovation Solution
Conductive wires are routed with opposite currents to cancel out electromagnetic fields, allowing for reduced radiation emission without extensive shielding, ensuring accessibility and minimal impact on charging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding is used to reduce electromagnetic radiation emission, then harmful radiation is reduced, but accessibility of electronics for maintenance is compromised
Solution Approach 1:
The patent applies active shielding by routing conductors carrying equal and opposite currents adjacent to each other, converting the harmful electromagnetic radiation into a beneficial cancellation effect. The magnetic fields generated by opposite currents naturally cancel each other, reducing radiation emission without requiring passive shielding materials that would block access to electronics for maintenance
2Object-affected harmful factors
If extensive shielding is implemented to manage radiation emission, then harmful radiation is reduced, but device complexity increases
Solution Approach 1:
Instead of adding complex passive shielding structures, the patent utilizes the existing current-carrying conductors to generate opposing magnetic fields that cancel radiation. This converts the functional conductors into active shielding elements, reducing radiation without increasing structural complexity
Solution Approach 2:
The conductors serve dual functions: transferring electrical power and providing active shielding against electromagnetic radiation. By routing conductors with opposite currents adjacent to each other, the same conductive elements perform both their primary electrical function and the secondary radiation mitigation function, eliminating the need for separate shielding components
3Object-affected harmful factors
If conductors are routed to provide active shielding, then electromagnetic radiation is reduced, but wiring complexity increases
Solution Approach 1:
The patent integrates radiation shielding functionality into the existing power transmission wiring by routing conductors with opposite currents adjacent to each other. This eliminates the need for separate shielding wires or cables, as the functional conductors themselves provide the shielding effect through their current configuration
Solution Approach 2:
The patent merges the power transmission function and radiation shielding function into a single wiring configuration. Conductors carrying opposite currents are routed adjacent to each other, combining the electrical connection purpose with the electromagnetic field cancellation purpose in one integrated structure
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 method effectively minimizes electromagnetic radiation without shielding, maintaining easy access for maintenance and preserving power transfer efficiency.
Implementation Method 1
Conductive wires are routed with opposite currents to cancel out electromagnetic fields
Data Source
AI summary
Described herein are techniques for routing conductive wires in a wireless power transfer pad. Such techniques may comprise routing, for a length of wiring between a power source and an inductive coil, a first conductive wire configured to carry a first current, routing, for a first portion of the length of wiring, a second conductive wire next to the first conductive wire, wherein the second conductive wire is configured to carry a second current having a direction that is substantially opposite that of the first current, and routing, for a second portion of the length of wiring, a portion of the inductive coil next to the first conductive wire, wherein the portion of the inductive coil is configured to carry a third current having a direction that is substantially opposite that of the first current.