Hollow Shield Wireless Power Transmission Device
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Solution Overview
Problem
Existing power transfer systems for wireless charging face challenges in maintaining a compact size due to the increased height of power transmission devices, which can lead to inefficiencies and longer charging times if the natural frequencies of the power transmission and reception units are not closely matched.
Innovation Solution
A power transfer system with a power transmission device featuring a hollow-shaped shield that allows electromagnetic waves to pass through on one side, while a shield member on the opposite side prevents electromagnetic wave leakage, and a power reception device with a similar configuration, ensuring the natural frequencies of both units are within 10% of each other to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield box is used to surround the power transmission unit with shield members on all sides, then electromagnetic wave leakage is prevented, but the device height increases
Solution Approach 1:
The invention extracts the shield member from the traditional enclosed shield box configuration and repositions it to only the opposite side of the power transmission unit. This selective placement removes unnecessary shielding components while maintaining the essential function of preventing electromagnetic wave leakage in the critical direction, thereby reducing device height.
Solution Approach 2:
The invention applies shielding locally rather than uniformly throughout the entire structure. By placing the shield member only on the opposite side where electromagnetic wave leakage is most problematic, the solution achieves effective leakage prevention with minimal structural impact, avoiding the need for a complete enclosed shield box.
2Productivity
If the natural frequencies of power transmission and reception units are not closely matched, then frequency matching requirements are relaxed, but power transfer efficiency decreases and charging time increases
Solution Approach 1:
The invention implements a feedback mechanism where the control unit monitors the coupling coefficient between power transmission and reception units and adjusts the operating frequency accordingly. This feedback system ensures that the natural frequencies remain closely matched during operation, maintaining high power transfer efficiency and fast charging speeds without requiring extremely precise initial frequency matching.
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 prevents the increase in size of the power transmission device, improves power transfer efficiency, and reduces charging time by maintaining a close match between the natural frequencies of the power transmission and reception units.
Implementation Method 1
a power transmission unit (28) and a power reception unit (27) that transmit and receive electric power to and from each other in a contactless manner through electromagnetic waves that oscillate at a specific frequency
Implementation Method 2
a power transmission unit (28) and a power reception unit (27) that transmit and receive electric power to and from each other in a contactless manner through electromagnetic waves that oscillate at a specific frequency
Data Source
AI summary
A power transmission device includes a power transmission unit transmitting electric power in a contactless manner to a power reception unit provided outside; and a power transmission-side shield formed in a hollow shape and provided so as to surround the power transmission unit. An electromagnetic wave can pass through a region on a side opposite to a region where the power reception unit is located across the power transmission-side shield. The power transmission-side shield is provided with a shield member on a side opposite to the power transmission unit across the power transmission-side shield.